36 files changed, 9968 insertions, 0 deletions

diff --git a/src/lib/util/tests/Makefile.am b/src/lib/util/tests/Makefile.am
new file mode 100644
index 0000000..430c53d
--- /dev/null
+++ b/src/lib/util/tests/Makefile.am
@@ -0,0 +1,68 @@
+SUBDIRS = .
+
+AM_CPPFLAGS  =
+AM_CPPFLAGS += -DABS_SRCDIR=\"$(abs_srcdir)\"
+AM_CPPFLAGS += -DTEST_DATA_BUILDDIR=\"$(abs_builddir)\"
+AM_CPPFLAGS += -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
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+
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+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += bigint_unittest.cc
+run_unittests_SOURCES += boost_time_utils_unittest.cc
+run_unittests_SOURCES += buffer_unittest.cc
+run_unittests_SOURCES += chrono_time_utils_unittest.cc
+run_unittests_SOURCES += csv_file_unittest.cc
+run_unittests_SOURCES += dhcp_space_unittest.cc
+run_unittests_SOURCES += doubles_unittest.cc
+run_unittests_SOURCES += encode_unittest.cc
+run_unittests_SOURCES += fd_share_tests.cc
+run_unittests_SOURCES += fd_tests.cc
+run_unittests_SOURCES += filesystem_unittests.cc
+run_unittests_SOURCES += hash_unittest.cc
+run_unittests_SOURCES += io_unittests.cc
+run_unittests_SOURCES += labeled_value_unittest.cc
+run_unittests_SOURCES += memory_segment_common_unittest.cc
+run_unittests_SOURCES += memory_segment_common_unittest.h
+run_unittests_SOURCES += memory_segment_local_unittest.cc
+run_unittests_SOURCES += multi_threading_mgr_unittest.cc
+run_unittests_SOURCES += optional_unittest.cc
+run_unittests_SOURCES += pid_file_unittest.cc
+run_unittests_SOURCES += range_utilities_unittest.cc
+run_unittests_SOURCES += readwrite_mutex_unittest.cc
+run_unittests_SOURCES += staged_value_unittest.cc
+run_unittests_SOURCES += state_model_unittest.cc
+run_unittests_SOURCES += stopwatch_unittest.cc
+run_unittests_SOURCES += str_unittests.cc
+run_unittests_SOURCES += thread_pool_unittest.cc
+run_unittests_SOURCES += triplet_unittest.cc
+run_unittests_SOURCES += unlock_guard_unittests.cc
+run_unittests_SOURCES += utf8_unittest.cc
+run_unittests_SOURCES += versioned_csv_file_unittest.cc
+run_unittests_SOURCES += watch_socket_unittests.cc
+run_unittests_SOURCES += watched_thread_unittest.cc
+
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+run_unittests_LDFLAGS = $(AM_LDFLAGS) $(GTEST_LDFLAGS)
+
+run_unittests_LDADD  = $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/io/libkea-util-io.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+run_unittests_LDADD += $(GTEST_LDADD)
+endif
+
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diff --git a/src/lib/util/tests/Makefile.in b/src/lib/util/tests/Makefile.in
new file mode 100644
index 0000000..8652f8c
--- /dev/null
+++ b/src/lib/util/tests/Makefile.in
@@ -0,0 +1,1649 @@
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+          dir2=`echo "$$dir2" | sed -e "$$sed_rest"`; \
+        else \
+          dir2="../$$dir2"; \
+        fi; \
+        dir0="$$dir0"/"$$first"; \
+      fi; \
+    fi; \
+    dir1=`echo "$$dir1" | sed -e "$$sed_rest"`; \
+  done; \
+  reldir="$$dir2"
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diff --git a/src/lib/util/tests/bigint_unittest.cc b/src/lib/util/tests/bigint_unittest.cc
new file mode 100644
index 0000000..bbd2c29
--- /dev/null
+++ b/src/lib/util/tests/bigint_unittest.cc
@@ -0,0 +1,160 @@
+// Copyright (C) 2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <util/bigints.h>
+
+#include <gtest/gtest.h>
+
+#include <limits>
+
+using namespace isc::util;
+
+using namespace std;
+
+namespace {
+
+// C++ doesn't allow very big integer literals, so that's why some tests on big
+// numbers might appear like they're unnecessarily circumventing a more obvious
+// test choice.
+
+// Checks that int128_t behaves like a signed integer should.
+TEST(BigintTest, int128) {
+    // Check addition with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(24, int128_t(16) + int128_t(8));
+    });
+
+    // Check subtraction with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(48, int128_t(64) - int128_t(16));
+    });
+
+    // Check multiplication with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(8, int128_t(2) * int128_t(4));
+    });
+
+    // Check division with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(16, int128_t(64) / int128_t(4));
+    });
+
+    // Check rounded division with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(16, int128_t(65) / int128_t(4));
+    });
+
+    // Check that INT128_MIN < INT64_MIN.
+    EXPECT_NO_THROW({
+        EXPECT_LT(numeric_limits<int128_t>::min(), numeric_limits<int64_t>::min());
+    });
+
+    // Check that UINT64_MAX < INT128_MAX.
+    EXPECT_NO_THROW({
+        EXPECT_LT(numeric_limits<uint64_t>::max(), numeric_limits<int128_t>::max());
+    });
+
+    // Check that int128_t is default-initialized to zero. Not a strict
+    // requirement by Kea, but something that the current implementation ensures.
+    int128_t i128;
+    EXPECT_NO_THROW({
+        EXPECT_EQ(0, i128);
+    });
+
+    // Shifting to the right beyond zero does not result in an underflow error.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(0, uint128_t(1) >> 2);
+    });
+
+    // Check that dividing by zero throws.
+    EXPECT_THROW_MSG(int128_t(1) / 0, overflow_error, "Division by zero.");
+
+    // Check that underflowing results in an error.
+    i128 = numeric_limits<int128_t>::min();
+    EXPECT_THROW_MSG(i128 - 1, overflow_error, "overflow in addition");
+    EXPECT_THROW_MSG(i128 + i128, overflow_error, "overflow in addition");
+
+    // Check that overflowing results in an error.
+    i128 = numeric_limits<int128_t>::max();
+    EXPECT_THROW_MSG(i128 + 1, overflow_error, "overflow in addition");
+    EXPECT_THROW_MSG(i128 + i128, overflow_error, "overflow in addition");
+    EXPECT_THROW_MSG(2 * i128, overflow_error, "overflow in multiplication");
+    EXPECT_THROW_MSG(i128 << 1, overflow_error, "Shift out of range");
+}
+
+// Checks that uint128_t behaves like an unsigned integer should.
+TEST(BigintTest, uint128) {
+    // Check addition with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(24, uint128_t(16) + uint128_t(8));
+    });
+
+    // Check subtraction with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(48, uint128_t(64) - uint128_t(16));
+    });
+
+    // Check multiplication with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(8, uint128_t(2) * uint128_t(4));
+    });
+
+    // Check division with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(16, uint128_t(64) / uint128_t(4));
+    });
+
+    // Check rounded division with small numbers.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(16, uint128_t(65) / uint128_t(4));
+    });
+
+    // Check that UINT128_MIN is 0.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(0, numeric_limits<uint128_t>::min());
+    });
+
+    // Check that UINT64_MAX < UINT128_MAX.
+    EXPECT_NO_THROW({
+        EXPECT_LT(numeric_limits<uint64_t>::max(), numeric_limits<int128_t>::max());
+    });
+
+    // Check that INT128_MAX < UINT128_MAX.
+    EXPECT_NO_THROW({
+        EXPECT_LT(numeric_limits<uint64_t>::max(), numeric_limits<int128_t>::max());
+    });
+
+    // Check that uint128_t is default-initialized to zero. Not a strict
+    // requirement by Kea, but something that the current implementation ensures.
+    uint128_t u128;
+    EXPECT_NO_THROW({
+        EXPECT_EQ(0, u128);
+    });
+
+    // Shifting to the right beyond zero does not result in an underflow error.
+    EXPECT_NO_THROW({
+        EXPECT_EQ(0, uint128_t(1) >> 2);
+    });
+
+    // Check that dividing by zero throws.
+    EXPECT_THROW_MSG(uint128_t(1) / 0, overflow_error, "Division by zero.");
+
+    // Check that underflowing results in an error.
+    u128 = numeric_limits<uint128_t>::min();
+    EXPECT_THROW_MSG(u128 - 1, range_error, "Subtraction resulted in a negative value, but the type is unsigned");
+
+    // Check that overflowing results in an error.
+    u128 = numeric_limits<uint128_t>::max();
+    EXPECT_THROW_MSG(u128 + 1, overflow_error, "overflow in addition");
+    EXPECT_THROW_MSG(u128 + u128, overflow_error, "overflow in addition");
+    EXPECT_THROW_MSG(2 * u128, overflow_error, "overflow in multiplication");
+    EXPECT_THROW_MSG(u128 << 1, overflow_error, "Shift out of range");
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/boost_time_utils_unittest.cc b/src/lib/util/tests/boost_time_utils_unittest.cc
new file mode 100644
index 0000000..643578e
--- /dev/null
+++ b/src/lib/util/tests/boost_time_utils_unittest.cc
@@ -0,0 +1,99 @@
+// Copyright (C) 2015-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/boost_time_utils.h>
+
+#include <string.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc::util;
+using namespace boost::posix_time;
+using namespace boost::gregorian;
+
+/// Check the ptimeToText() function returns a numeric month.
+/// Note durationToText() is called by ptimeToText() so is tested too.
+
+// The Posix time epoch is 1970
+TEST(BoostTimeUtilsTest, epoch) {
+    time_t tepoch = 0;
+    ptime pepoch = from_time_t(tepoch);
+
+    // We're going to loop through precision values starting with 0 through
+    // the max supported precision.  Each pass should after the first, should
+    // add an additional level of precision: secs, secs/10, secs/100,
+    // secs/1000 and so on.  The initial string has no fraction seconds.
+    std::string expected("1970-01-01 00:00:00");
+    std::string sepoch;
+    for (size_t precision = 0; precision <= MAX_FSECS_PRECISION; ++precision) {
+        if (precision == 1) {
+            // Adding fractional seconds so we need append a decimal point.
+            expected.push_back('.');
+        }
+
+        if (precision >= 1) {
+            // Adding an additional level of precision, append a zero.
+            expected.push_back('0');
+        }
+
+        // Now let's see if we get the correct precision in the text.
+        sepoch = ptimeToText(pepoch, precision);
+        EXPECT_EQ(expected, sepoch) << " test precision:" << precision;
+    }
+
+    // Expected string should have same precision as default, so
+    // test the default.
+    sepoch = ptimeToText(pepoch);
+    EXPECT_EQ(expected, sepoch);
+
+    // Now test a requested precision beyond default.  We should
+    // get the default precision.
+    sepoch = ptimeToText(pepoch, MAX_FSECS_PRECISION + 1);
+    EXPECT_EQ(expected, sepoch);
+
+}
+
+// The 2015 Bastille day
+TEST(BoostTimeUtilsTest, bastilleDay) {
+    time_duration tdbast =
+        hours(12) + minutes(13) + seconds(14) + milliseconds(500);
+    ptime pbast(date(2015, Jul, 14), tdbast);
+
+    // We're going to loop through precision values starting with 0 through
+    // the max supported precision.  Each pass should after the first, should
+    // add an additional level of precision: secs, secs/10, secs/100,
+    // secs/1000 and so on.  The initial string has no fraction seconds.
+    std::string expected("2015-07-14 12:13:14");
+    std::string sbast;
+    for (size_t precision = 0; precision <= MAX_FSECS_PRECISION; ++precision) {
+        if (precision == 1) {
+            // Adding fractional seconds so we need append a decimal point
+            // and the digit 5 (i.e. 500 ms = .5 secs).
+            expected.push_back('.');
+            expected.push_back('5');
+        } else if (precision > 1) {
+            // Adding an additional level of precision, append a zero.
+            expected.push_back('0');
+        }
+
+        // Now let's see if we get the correct precision in the text.
+        sbast = ptimeToText(pbast, precision);
+        EXPECT_EQ(expected, sbast) << " test precision:" << precision;
+    }
+
+    // Expected string should have same precision as default, so
+    // test the default.
+    sbast = ptimeToText(pbast);
+    EXPECT_EQ(expected, sbast);
+
+    // Now test a requested precision beyond default.  We should
+    // get the default precision.
+    sbast = ptimeToText(pbast, MAX_FSECS_PRECISION + 1);
+    EXPECT_EQ(expected, sbast);
+}
diff --git a/src/lib/util/tests/buffer_unittest.cc b/src/lib/util/tests/buffer_unittest.cc
new file mode 100644
index 0000000..1c98571
--- /dev/null
+++ b/src/lib/util/tests/buffer_unittest.cc
@@ -0,0 +1,312 @@
+// Copyright (C) 2009-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <util/buffer.h>
+
+#ifdef EXPECT_DEATH
+#include <util/unittests/resource.h>
+#include <util/unittests/check_valgrind.h>
+#endif /* EXPECT_DEATH */
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+class BufferTest : public ::testing::Test {
+protected:
+    BufferTest() : ibuffer(testdata, sizeof(testdata)), obuffer(0),
+                   expected_size(0) {
+        data16 = (2 << 8) | 3;
+        data32 = (4 << 24) | (5 << 16) | (6 << 8) | 7;
+        memset(vdata, 0, sizeof(testdata));
+    }
+
+    InputBuffer ibuffer;
+    OutputBuffer obuffer;
+    static const uint8_t testdata[5];
+    uint8_t vdata[sizeof(testdata)];
+    size_t expected_size;
+    uint16_t data16;
+    uint32_t data32;
+    std::vector<uint8_t> datav;
+};
+
+const uint8_t BufferTest::testdata[5] = {1, 2, 3, 4, 5};
+
+TEST_F(BufferTest, inputBufferRead) {
+    EXPECT_EQ(5, ibuffer.getLength());
+    EXPECT_EQ(1, ibuffer.peekUint8());
+    EXPECT_EQ(0, ibuffer.getPosition());
+    EXPECT_EQ(1, ibuffer.readUint8());
+    EXPECT_EQ(1, ibuffer.getPosition());
+    data16 = ibuffer.peekUint16();
+    EXPECT_EQ(1, ibuffer.getPosition());
+    EXPECT_EQ(data16, ibuffer.readUint16());
+    EXPECT_EQ((2 << 8) | 3, data16);
+    EXPECT_EQ(3, ibuffer.getPosition());
+    ibuffer.setPosition(1);
+    EXPECT_EQ(1, ibuffer.getPosition());
+    data32 = ibuffer.peekUint32();
+    EXPECT_EQ(1, ibuffer.getPosition());
+    EXPECT_EQ(data32, ibuffer.readUint32());
+    EXPECT_EQ((2 << 24) | (3 << 16) | (4 << 8) | 5, data32);
+    ibuffer.setPosition(0);
+    memset(vdata, 0, sizeof(vdata));
+    ibuffer.peekData(vdata, sizeof(vdata));
+    EXPECT_EQ(0, memcmp(vdata, testdata, sizeof(testdata)));
+    EXPECT_EQ(0, ibuffer.getPosition());
+    memset(vdata, 0, sizeof(vdata));
+    ibuffer.readData(vdata, sizeof(vdata));
+    EXPECT_EQ(0, memcmp(vdata, testdata, sizeof(testdata)));
+    EXPECT_EQ(sizeof(vdata), ibuffer.getPosition());
+    ibuffer.setPosition(0);
+    datav.clear();
+    ibuffer.peekVector(datav, sizeof(vdata));
+    ASSERT_EQ(sizeof(vdata), datav.size());
+    EXPECT_EQ(0, memcmp(&vdata[0], testdata, sizeof(testdata)));
+    EXPECT_EQ(0, ibuffer.getPosition());
+    datav.clear();
+    ibuffer.readVector(datav, sizeof(vdata));
+    ASSERT_EQ(sizeof(vdata), datav.size());
+    EXPECT_EQ(0, memcmp(&vdata[0], testdata, sizeof(testdata)));
+    EXPECT_EQ(sizeof(vdata), ibuffer.getPosition());
+}
+
+TEST_F(BufferTest, inputBufferException) {
+    EXPECT_THROW(ibuffer.setPosition(6), isc::OutOfRange);
+
+    ibuffer.setPosition(sizeof(testdata));
+    EXPECT_THROW(ibuffer.peekUint8(), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.readUint8(), isc::OutOfRange);
+
+    ibuffer.setPosition(sizeof(testdata) - 1);
+    EXPECT_THROW(ibuffer.peekUint16(), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.readUint16(), isc::OutOfRange);
+
+    ibuffer.setPosition(sizeof(testdata) - 3);
+    EXPECT_THROW(ibuffer.peekUint32(), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.readUint32(), isc::OutOfRange);
+
+    ibuffer.setPosition(sizeof(testdata) - 4);
+    EXPECT_THROW(ibuffer.peekData(vdata, sizeof(vdata)), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.readData(vdata, sizeof(vdata)), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.peekVector(datav, sizeof(vdata)), isc::OutOfRange);
+    EXPECT_THROW(ibuffer.readVector(datav, sizeof(vdata)), isc::OutOfRange);
+}
+
+TEST_F(BufferTest, outputBufferExtend) {
+    EXPECT_EQ(0, obuffer.getCapacity());
+    EXPECT_EQ(0, obuffer.getLength());
+    obuffer.writeUint8(10);
+    EXPECT_LT(0, obuffer.getCapacity());
+    EXPECT_EQ(1, obuffer.getLength());
+}
+
+TEST_F(BufferTest, outputBufferWrite) {
+    obuffer.writeUint8(1);
+    expected_size += sizeof(uint8_t);
+    EXPECT_EQ(expected_size, obuffer.getLength());
+    const uint8_t* cp = obuffer.getData();
+    EXPECT_EQ(1, *cp);
+
+    obuffer.writeUint16(data16);
+    expected_size += sizeof(data16);
+    cp = obuffer.getData();
+    EXPECT_EQ(expected_size, obuffer.getLength());
+    EXPECT_EQ(2, *(cp + 1));
+    EXPECT_EQ(3, *(cp + 2));
+
+    obuffer.writeUint32(data32);
+    expected_size += sizeof(data32);
+    cp = obuffer.getData();
+    EXPECT_EQ(expected_size, obuffer.getLength());
+    EXPECT_EQ(4, *(cp + 3));
+    EXPECT_EQ(5, *(cp + 4));
+    EXPECT_EQ(6, *(cp + 5));
+    EXPECT_EQ(7, *(cp + 6));
+
+    obuffer.writeData(testdata, sizeof(testdata));
+    expected_size += sizeof(testdata);
+    EXPECT_EQ(expected_size, obuffer.getLength());
+    cp = obuffer.getData();
+    EXPECT_EQ(0, memcmp(cp + 7, testdata, sizeof(testdata)));
+
+    datav = obuffer.getVector();
+    ASSERT_EQ(expected_size, datav.size());
+    std::vector<uint8_t> expected = { 1, 2, 3, 4, 5, 6, 7 };
+    expected.insert(expected.end(), testdata, testdata + sizeof(testdata));
+    ASSERT_EQ(expected_size, expected.size());
+    EXPECT_EQ(0, memcmp(&expected[0], &datav[0], expected_size));
+}
+
+TEST_F(BufferTest, outputBufferWriteAt) {
+    obuffer.writeUint32(data32);
+    expected_size += sizeof(data32);
+
+    // overwrite 2nd byte
+    obuffer.writeUint8At(4, 1);
+    EXPECT_EQ(expected_size, obuffer.getLength()); // length shouldn't change
+    const uint8_t* cp = obuffer.getData();
+    EXPECT_EQ(4, *(cp + 1));
+
+    // overwrite 2nd and 3rd bytes
+    obuffer.writeUint16At(data16, 1);
+    EXPECT_EQ(expected_size, obuffer.getLength()); // length shouldn't change
+    cp = obuffer.getData();
+    EXPECT_EQ(2, *(cp + 1));
+    EXPECT_EQ(3, *(cp + 2));
+
+    // overwrite 3rd and 4th bytes
+    obuffer.writeUint16At(data16, 2);
+    EXPECT_EQ(expected_size, obuffer.getLength());
+    cp = obuffer.getData();
+    EXPECT_EQ(2, *(cp + 2));
+    EXPECT_EQ(3, *(cp + 3));
+
+    EXPECT_THROW(obuffer.writeUint8At(data16, 5), isc::OutOfRange);
+    EXPECT_THROW(obuffer.writeUint8At(data16, 4), isc::OutOfRange);
+    EXPECT_THROW(obuffer.writeUint16At(data16, 3), isc::OutOfRange);
+    EXPECT_THROW(obuffer.writeUint16At(data16, 4), isc::OutOfRange);
+    EXPECT_THROW(obuffer.writeUint16At(data16, 5), isc::OutOfRange);
+}
+
+TEST_F(BufferTest, outputBufferSkip) {
+    obuffer.skip(4);
+    EXPECT_EQ(4, obuffer.getLength());
+
+    obuffer.skip(2);
+    EXPECT_EQ(6, obuffer.getLength());
+}
+
+TEST_F(BufferTest, outputBufferTrim) {
+    obuffer.writeData(testdata, sizeof(testdata));
+    EXPECT_EQ(5, obuffer.getLength());
+
+    obuffer.trim(1);
+    EXPECT_EQ(4, obuffer.getLength());
+
+    obuffer.trim(2);
+    EXPECT_EQ(2, obuffer.getLength());
+
+    EXPECT_THROW(obuffer.trim(3), OutOfRange);
+}
+
+TEST_F(BufferTest, outputBufferReadAt) {
+    obuffer.writeData(testdata, sizeof(testdata));
+    for (size_t i = 0; i < sizeof(testdata); ++i) {
+        EXPECT_EQ(testdata[i], obuffer[i]);
+    }
+    EXPECT_THROW(obuffer[sizeof(testdata)], isc::OutOfRange);
+}
+
+TEST_F(BufferTest, outputBufferClear) {
+    obuffer.writeData(testdata, sizeof(testdata));
+    const uint8_t* cp = obuffer.getData();
+    obuffer.clear();
+    EXPECT_EQ(0, obuffer.getLength());
+    EXPECT_FALSE(obuffer.getData());
+}
+
+TEST_F(BufferTest, outputBufferCopy) {
+    EXPECT_NO_THROW({
+        obuffer.writeData(testdata, sizeof(testdata));
+
+        OutputBuffer copy(obuffer);
+        ASSERT_EQ(sizeof(testdata), copy.getLength());
+        ASSERT_NE(obuffer.getData(), copy.getData());
+        for (size_t i = 0; i < sizeof(testdata); ++i) {
+            EXPECT_EQ(testdata[i], copy[i]);
+            if (i + 1 < sizeof(testdata)) {
+                obuffer.writeUint16At(0, i);
+            }
+            EXPECT_EQ(testdata[i], copy[i]);
+        }
+        obuffer.clear();
+        ASSERT_EQ(sizeof(testdata), copy.getLength());
+    });
+}
+
+TEST_F(BufferTest, outputEmptyBufferCopy) {
+    EXPECT_NO_THROW({
+        OutputBuffer copy(obuffer);
+        ASSERT_EQ(0, copy.getLength());
+        EXPECT_FALSE(copy.getData());
+    });
+}
+
+TEST_F(BufferTest, outputBufferAssign) {
+    EXPECT_NO_THROW({
+        OutputBuffer another(0);
+        another.clear();
+        obuffer.writeData(testdata, sizeof(testdata));
+
+        another = obuffer;
+        ASSERT_EQ(sizeof(testdata), another.getLength());
+        ASSERT_NE(obuffer.getData(), another.getData());
+        for (size_t i = 0; i < sizeof(testdata); ++i) {
+            EXPECT_EQ(testdata[i], another[i]);
+            if (i + 1 < sizeof(testdata)) {
+                obuffer.writeUint16At(0, i);
+            }
+            EXPECT_EQ(testdata[i], another[i]);
+        }
+        obuffer.clear();
+        ASSERT_EQ(sizeof(testdata), another.getLength());
+    });
+}
+
+TEST_F(BufferTest, outputEmptyBufferAssign) {
+    OutputBuffer copy(0);
+    EXPECT_NO_THROW(copy = obuffer;);
+    EXPECT_EQ(0, copy.getLength());
+    EXPECT_EQ(0, copy.getData());
+}
+
+// Check assign to self doesn't break stuff
+TEST_F(BufferTest, outputBufferAssignSelf) {
+    EXPECT_NO_THROW(obuffer = obuffer);
+}
+
+TEST_F(BufferTest, inputBufferReadVectorChunks) {
+    std::vector<uint8_t> vec;
+
+    // check that vector can read the whole buffer
+    ibuffer.readVector(vec, 3);
+    EXPECT_EQ(3, vec.size());
+    EXPECT_EQ(0, memcmp(&vec[0], testdata, 3));
+    EXPECT_NO_THROW(ibuffer.readVector(vec, 2));
+    ASSERT_EQ(2, vec.size());
+    EXPECT_EQ(0, memcmp(&vec[0], &testdata[3], 2));
+}
+
+// Tests whether uint64 can be written properly.
+TEST_F(BufferTest, writeUint64) {
+    uint64_t val1 = 0x0102030405060708ul;
+    uint64_t val2 = 0xfffffffffffffffful;
+    uint8_t exp_val1[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
+    uint8_t exp_val2[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+    obuffer.writeUint64(val1);
+    ASSERT_EQ(sizeof(uint64_t), obuffer.getLength());
+    const uint8_t* cp = obuffer.getData();
+    EXPECT_TRUE(cp);
+    EXPECT_FALSE(memcmp(exp_val1, obuffer.getData(), sizeof(uint64_t)));
+
+    EXPECT_NO_THROW(obuffer.clear());
+    obuffer.writeUint64(val2);
+    ASSERT_EQ(sizeof(uint64_t), obuffer.getLength());
+    cp = obuffer.getData();
+    EXPECT_TRUE(cp);
+    EXPECT_FALSE(memcmp(exp_val2, obuffer.getData(), sizeof(uint64_t)));
+}
+
+}
diff --git a/src/lib/util/tests/chrono_time_utils_unittest.cc b/src/lib/util/tests/chrono_time_utils_unittest.cc
new file mode 100644
index 0000000..f94ef7b
--- /dev/null
+++ b/src/lib/util/tests/chrono_time_utils_unittest.cc
@@ -0,0 +1,159 @@
+// Copyright (C) 2015-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/chrono_time_utils.h>
+
+#include <string.h>
+#include <time.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace std::chrono;
+using namespace isc::util;
+
+/// Check the clockToText() function returns a numeric month.
+TEST(ChronoTimeUtilsTest, epoch) {
+    // The system clock is a wall clock using the local time zone so
+    // the epoch is zero only at some places or of course if the
+    // system is in UTC...
+    struct tm epoch;
+    memset(&epoch, 0, sizeof(epoch));
+    epoch.tm_year = 70;
+    epoch.tm_mday = 1;
+    epoch.tm_isdst = -1;
+    time_t tepoch = mktime(&epoch);
+    system_clock::time_point pepoch = system_clock::from_time_t(tepoch);
+
+    // We're going to loop through precision values starting with 0 through
+    // the max supported precision.  Each pass should after the first, should
+    // add an additional level of precision: secs, secs/10, secs/100,
+    // secs/1000 and so on.  The initial string has no fraction seconds.
+    std::string expected("1970-01-01 00:00:00");
+    std::string sepoch;
+    for (size_t precision = 0; precision <= MAX_FSECS_PRECISION; ++precision) {
+        if (precision == 1) {
+            // Adding fractional seconds so we need append a decimal point.
+            expected.push_back('.');
+        }
+
+        if (precision >= 1) {
+            // Adding an additional level of precision, append a zero.
+            expected.push_back('0');
+        }
+
+        // Now let's see if we get the correct precision in the text.
+        sepoch = clockToText(pepoch, precision);
+        EXPECT_EQ(expected, sepoch) << " test precision:" << precision;
+    }
+
+    // Expected string should have same precision as default, so
+    // test the default.
+    sepoch = clockToText(pepoch);
+    EXPECT_EQ(expected, sepoch);
+
+    // Now test a requested precision beyond default.  We should
+    // get the default precision.
+    sepoch = clockToText(pepoch, MAX_FSECS_PRECISION + 1);
+    EXPECT_EQ(expected, sepoch);
+
+}
+
+/// Check the durationToText() works as expected.
+/// Note durationToText() is not called by clockToText().
+TEST(ChronoTimeUtilsTest, duration) {
+    system_clock::duration p123 = hours(1) + minutes(2) + seconds(3);
+
+    // We're going to loop through precision values starting with 0 through
+    // the max supported precision.  Each pass should after the first, should
+    // add an additional level of precision: secs, secs/10, secs/100,
+    // secs/1000 and so on.  The initial string has no fraction seconds.
+    std::string expected("01:02:03");
+    std::string s123;
+    for (size_t precision = 0; precision <= MAX_FSECS_PRECISION; ++precision) {
+        if (precision == 1) {
+            // Adding fractional seconds so we need append a decimal point.
+            expected.push_back('.');
+        }
+
+        if (precision >= 1) {
+            // Adding an additional level of precision, append a zero.
+            expected.push_back('0');
+        }
+
+        // Now let's see if we get the correct precision in the text.
+        s123 = durationToText(p123, precision);
+        EXPECT_EQ(expected, s123) << " test precision:" << precision;
+    }
+
+    // Expected string should have same precision as default, so
+    // test the default.
+    s123 = durationToText(p123);
+    EXPECT_EQ(expected, s123);
+
+    // Now test a requested precision beyond default.  We should
+    // get the default precision.
+    s123 = durationToText(p123, MAX_FSECS_PRECISION + 1);
+    EXPECT_EQ(expected, s123);
+}
+
+// The 2015 Bastille day
+TEST(ChronoTimeUtilsTest, bastilleDay) {
+    struct tm tm;
+    tm.tm_year = 2015 - 1900;
+    tm.tm_mon = 7 - 1;
+    tm.tm_mday = 14;
+    tm.tm_hour = 12;
+    tm.tm_min = 13;
+    tm.tm_sec = 14;
+    tm.tm_isdst = -1;
+    time_t tbast = mktime(&tm);
+    system_clock::time_point tpbast = system_clock::from_time_t(tbast);
+    tpbast += milliseconds(500);
+
+    // We're going to loop through precision values starting with 0 through
+    // the max supported precision.  Each pass should after the first, should
+    // add an additional level of precision: secs, secs/10, secs/100,
+    // secs/1000 and so on.  The initial string has no fraction seconds.
+    std::string expected("2015-07-14 12:13:14");
+    std::string sbast;
+    for (size_t precision = 0; precision <= MAX_FSECS_PRECISION; ++precision) {
+        if (precision == 1) {
+            // Adding fractional seconds so we need append a decimal point
+            // and the digit 5 (i.e. 500 ms = .5 secs).
+            expected.push_back('.');
+            expected.push_back('5');
+        } else if (precision > 1) {
+            // Adding an additional level of precision, append a zero.
+            expected.push_back('0');
+        }
+
+        // Now let's see if we get the correct precision in the text.
+        sbast = clockToText(tpbast, precision);
+        EXPECT_EQ(expected, sbast) << " test precision:" << precision;
+    }
+
+    // Expected string should have same precision as default, so
+    // test the default.
+    sbast = clockToText(tpbast);
+    EXPECT_EQ(expected, sbast);
+
+    // Now test a requested precision beyond default.  We should
+    // get the default precision.
+    sbast = clockToText(tpbast, MAX_FSECS_PRECISION + 1);
+    EXPECT_EQ(expected, sbast);
+}
+
+// Try steady clock duration.
+TEST(ChronoTimeUtilsTest, steadyClock) {
+    steady_clock::duration p12345 = hours(1) + minutes(2) + seconds(3) +
+        milliseconds(4) + microseconds(5);
+    std::string expected("01:02:03.004005");
+    std::string s12345 = durationToText(p12345, 6);
+    EXPECT_EQ(expected, s12345);
+}
diff --git a/src/lib/util/tests/csv_file_unittest.cc b/src/lib/util/tests/csv_file_unittest.cc
new file mode 100644
index 0000000..f55ec55
--- /dev/null
+++ b/src/lib/util/tests/csv_file_unittest.cc
@@ -0,0 +1,700 @@
+// Copyright (C) 2014-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <util/csv_file.h>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+namespace {
+
+using namespace isc::util;
+
+// This test exercises escaping and unescaping of characters.
+TEST(CSVRowTest, escapeUnescape) {
+    std::string orig(",FO^O\\,B?,AR,");
+
+    // We'll escape commas, question marks, and carets.
+    std::string escaped = CSVRow::escapeCharacters(orig, ",?^");
+    EXPECT_EQ ("&#x2cFO&#x5eO\\&#x2cB&#x3f&#x2cAR&#x2c", escaped);
+
+    // Now make sure we can unescape it correctly.
+    std::string unescaped = CSVRow::unescapeCharacters(escaped);
+    EXPECT_EQ (orig, unescaped);
+
+    // Make sure that an incident occurrence of just the escape tag
+    // is left intact.
+    orig = ("no&#xescape");
+    escaped = CSVRow::escapeCharacters(orig, ",");
+    unescaped = CSVRow::unescapeCharacters(orig);
+    EXPECT_EQ (orig, unescaped);
+
+    // Make sure that an incidental occurrence of a valid
+    // escape tag sequence left intact.
+    orig = ("no&#x2cescape");
+    escaped = CSVRow::escapeCharacters(orig, ",");
+    unescaped = CSVRow::unescapeCharacters(escaped);
+    EXPECT_EQ (orig, unescaped);
+}
+
+// This test checks that the single data row is parsed.
+TEST(CSVRow, parse) {
+    CSVRow row0("foo,bar,foo-bar");
+    ASSERT_EQ(3, row0.getValuesCount());
+    EXPECT_EQ("foo", row0.readAt(0));
+    EXPECT_EQ("bar", row0.readAt(1));
+    EXPECT_EQ("foo-bar", row0.readAt(2));
+
+    row0.parse("bar,,foo-bar");
+    ASSERT_EQ(3, row0.getValuesCount());
+    EXPECT_EQ("bar", row0.readAt(0));
+    EXPECT_TRUE(row0.readAt(1).empty());
+    EXPECT_EQ("foo-bar", row0.readAt(2));
+
+    row0.parse("bar,foo&#x2c-bar");
+    ASSERT_EQ(2, row0.getValuesCount());
+    EXPECT_EQ("bar", row0.readAt(0));
+    // Read the second column as-is and escaped
+    EXPECT_EQ("foo&#x2c-bar", row0.readAt(1));
+    EXPECT_EQ("foo,-bar", row0.readAtEscaped(1));
+
+    CSVRow row1("foo-bar|foo|bar|", '|');
+    ASSERT_EQ(4, row1.getValuesCount());
+    EXPECT_EQ("foo-bar", row1.readAt(0));
+    EXPECT_EQ("foo", row1.readAt(1));
+    EXPECT_EQ("bar", row1.readAt(2));
+    EXPECT_TRUE(row1.readAt(3).empty());
+
+    row1.parse("");
+    ASSERT_EQ(1, row1.getValuesCount());
+    EXPECT_TRUE(row1.readAt(0).empty());
+}
+
+// Verifies that empty columns are handled correctly.
+TEST(CSVRow, emptyColumns) {
+    // Should get four columns, all blank except column the second one.
+    CSVRow row(",one,,");
+    ASSERT_EQ(4, row.getValuesCount());
+    EXPECT_EQ("", row.readAt(0));
+    EXPECT_EQ("one", row.readAt(1));
+    EXPECT_EQ("", row.readAt(2));
+    EXPECT_EQ("", row.readAt(3));
+}
+
+// Verifies that empty columns are handled correctly.
+TEST(CSVRow, oneColumn) {
+    // Should get one column
+    CSVRow row("zero");
+    ASSERT_EQ(1, row.getValuesCount());
+    EXPECT_EQ("zero", row.readAt(0));
+}
+
+// This test checks that the text representation of the CSV row
+// is created correctly.
+TEST(CSVRow, render) {
+    CSVRow row0(3);
+    row0.writeAt(0, "foo");
+    row0.writeAt(1, "foo-bar");
+    row0.writeAt(2, "bar");
+
+    std::string text;
+    ASSERT_NO_THROW(text = row0.render());
+    EXPECT_EQ(text, "foo,foo-bar,bar");
+
+    CSVRow row1(4, ';');
+    row1.writeAt(0, "foo");
+    row1.writeAt(2, "bar");
+    row1.writeAt(3, 10);
+
+    ASSERT_NO_THROW(text = row1.render());
+    EXPECT_EQ(text, "foo;;bar;10");
+
+    CSVRow row2(0);
+    ASSERT_NO_THROW(text = row2.render());
+    EXPECT_TRUE(text.empty());
+}
+
+// This test checks that the data values can be set for the CSV row.
+TEST(CSVRow, writeAt) {
+    CSVRow row(4);
+    row.writeAt(0, 10);
+    row.writeAt(1, "foo");
+    row.writeAt(2, "bar");
+    row.writeAtEscaped(3, "bar,one,two");
+
+    EXPECT_EQ("10", row.readAt(0));
+    EXPECT_EQ("foo", row.readAt(1));
+    EXPECT_EQ("bar", row.readAt(2));
+    // Read third column as-is and unescaped
+    EXPECT_EQ("bar&#x2cone&#x2ctwo", row.readAt(3));
+    EXPECT_EQ("bar,one,two", row.readAtEscaped(3));
+
+    EXPECT_THROW(row.writeAt(4, 20), CSVFileError);
+    EXPECT_THROW(row.writeAt(4, "foo"), CSVFileError);
+}
+
+// Checks whether writeAt() and append() can be mixed together.
+TEST(CSVRow, append) {
+    CSVRow row(3);
+
+    EXPECT_EQ(3, row.getValuesCount());
+
+    row.writeAt(0, "alpha");
+    ASSERT_NO_THROW(row.append("delta"));
+    EXPECT_EQ(4, row.getValuesCount());
+    row.writeAt(1, "beta");
+    row.writeAt(2, "gamma");
+    ASSERT_NO_THROW(row.append("epsilon"));
+    EXPECT_EQ(5, row.getValuesCount());
+
+    std::string text;
+    ASSERT_NO_THROW(text = row.render());
+    EXPECT_EQ("alpha,beta,gamma,delta,epsilon", text);
+}
+
+// This test checks that a row can be trimmed of
+// a given number of elements
+TEST(CSVRow, trim) {
+    CSVRow row("zero,one,two,three,four");
+    ASSERT_EQ(5, row.getValuesCount());
+    EXPECT_EQ("zero", row.readAt(0));
+    EXPECT_EQ("one", row.readAt(1));
+    EXPECT_EQ("two", row.readAt(2));
+    EXPECT_EQ("three", row.readAt(3));
+    EXPECT_EQ("four", row.readAt(4));
+
+    ASSERT_THROW(row.trim(10), CSVFileError);
+
+    // Verify that we can erase just one
+    ASSERT_NO_THROW(row.trim(1));
+    ASSERT_EQ(4, row.getValuesCount());
+    EXPECT_EQ("zero", row.readAt(0));
+    EXPECT_EQ("one", row.readAt(1));
+    EXPECT_EQ("two", row.readAt(2));
+    EXPECT_EQ("three", row.readAt(3));
+
+    // Verify we can trim more than one
+    ASSERT_NO_THROW(row.trim(2));
+    ASSERT_EQ(2, row.getValuesCount());
+    EXPECT_EQ("zero", row.readAt(0));
+    EXPECT_EQ("one", row.readAt(1));
+}
+
+/// @brief Test fixture class for testing operations on CSV file.
+///
+/// It implements basic operations on files, such as reading writing
+/// file removal and checking presence of the file. This is used by
+/// unit tests to verify correctness of the file created by the
+/// CSVFile class.
+class CSVFileTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Sets the path to the CSV file used throughout the tests.
+    /// The name of the file is test.csv and it is located in the
+    /// current build folder.
+    ///
+    /// It also deletes any dangling files after previous tests.
+    CSVFileTest();
+
+    /// @brief Destructor.
+    ///
+    /// Deletes the test CSV file if any.
+    virtual ~CSVFileTest();
+
+    /// @brief Prepends the absolute path to the file specified
+    /// as an argument.
+    ///
+    /// @param filename Name of the file.
+    /// @return Absolute path to the test file.
+    static std::string absolutePath(const std::string& filename);
+
+    /// @brief Check if test file exists on disk.
+    bool exists() const;
+
+    /// @brief Reads whole CSV file.
+    ///
+    /// @return Contents of the file.
+    std::string readFile() const;
+
+    /// @brief Removes existing file (if any).
+    int removeFile() const;
+
+    /// @brief Creates file with contents.
+    ///
+    /// @param contents Contents of the file.
+    void writeFile(const std::string& contents) const;
+
+    /// @brief Absolute path to the file used in the tests.
+    std::string testfile_;
+
+};
+
+CSVFileTest::CSVFileTest()
+    : testfile_(absolutePath("test.csv")) {
+    static_cast<void>(removeFile());
+}
+
+CSVFileTest::~CSVFileTest() {
+    static_cast<void>(removeFile());
+}
+
+std::string
+CSVFileTest::absolutePath(const std::string& filename) {
+    std::ostringstream s;
+    s << TEST_DATA_BUILDDIR << "/" << filename;
+    return (s.str());
+}
+
+bool
+CSVFileTest::exists() const {
+    std::ifstream fs(testfile_.c_str());
+    bool ok = fs.good();
+    fs.close();
+    return (ok);
+}
+
+std::string
+CSVFileTest::readFile() const {
+    std::ifstream fs(testfile_.c_str());
+    if (!fs.is_open()) {
+        return ("");
+    }
+    std::string contents((std::istreambuf_iterator<char>(fs)),
+                         std::istreambuf_iterator<char>());
+    fs.close();
+    return (contents);
+}
+
+int
+CSVFileTest::removeFile() const {
+    return (remove(testfile_.c_str()));
+}
+
+void
+CSVFileTest::writeFile(const std::string& contents) const {
+    std::ofstream fs(testfile_.c_str(), std::ofstream::out);
+    if (fs.is_open()) {
+        fs << contents;
+        fs.close();
+    }
+}
+
+// This test checks that the function which is used to add columns of the
+// CSV file works as expected.
+TEST_F(CSVFileTest, addColumn) {
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    // Add two columns.
+    ASSERT_NO_THROW(csv->addColumn("animal"));
+    ASSERT_NO_THROW(csv->addColumn("color"));
+    // Make sure we can't add duplicates.
+    EXPECT_THROW(csv->addColumn("animal"), CSVFileError);
+    EXPECT_THROW(csv->addColumn("color"), CSVFileError);
+    // But we should still be able to add unique columns.
+    EXPECT_NO_THROW(csv->addColumn("age"));
+    EXPECT_NO_THROW(csv->addColumn("comments"));
+    // Assert that the file is opened, because the rest of the test relies
+    // on this.
+    ASSERT_NO_THROW(csv->recreate());
+    ASSERT_TRUE(exists());
+
+    // Make sure we can't add columns (even unique) when the file is open.
+    ASSERT_THROW(csv->addColumn("zoo"), CSVFileError);
+    // Close the file.
+    ASSERT_NO_THROW(csv->close());
+    // And check that now it is possible to add the column.
+    EXPECT_NO_THROW(csv->addColumn("zoo"));
+}
+
+// This test checks that the appropriate file name is initialized.
+TEST_F(CSVFileTest, getFilename) {
+    CSVFile csv(testfile_);
+    EXPECT_EQ(testfile_, csv.getFilename());
+}
+
+// This test checks that the file can be opened,  its whole content is
+// parsed correctly and data may be appended. It also checks that empty
+// row is returned when EOF is reached.
+TEST_F(CSVFileTest, openReadAllWrite) {
+    // Create a new CSV file that contains a header and two data rows.
+    writeFile("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n");
+
+    // Open this file and check that the header is parsed.
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    ASSERT_NO_THROW(csv->open());
+    ASSERT_EQ(3, csv->getColumnCount());
+    EXPECT_EQ("animal", csv->getColumnName(0));
+    EXPECT_EQ("age", csv->getColumnName(1));
+    EXPECT_EQ("color", csv->getColumnName(2));
+
+    // Read first row.
+    CSVRow row;
+    ASSERT_TRUE(csv->next(row));
+    ASSERT_EQ(3, row.getValuesCount());
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("10", row.readAt(1));
+    EXPECT_EQ("white", row.readAt(2));
+
+    // Read second row.
+    ASSERT_TRUE(csv->next(row));
+    ASSERT_EQ(3, row.getValuesCount());
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("15", row.readAt(1));
+    EXPECT_EQ("yellow", row.readAt(2));
+
+    // There is no 3rd row, so the empty one should be returned.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+
+    // It should be fine to read again, but again empty row should be returned.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+
+    // Now, let's try to append something to this file.
+    CSVRow row_write(3);
+    row_write.writeAt(0, "dog");
+    row_write.writeAt(1, 2);
+    row_write.writeAt(2, "blue");
+    ASSERT_NO_THROW(csv->append(row_write));
+
+    // Close the file.
+    ASSERT_NO_THROW(csv->flush());
+    csv->close();
+
+    // Check the file contents are correct.
+    EXPECT_EQ("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n"
+              "dog,2,blue\n",
+              readFile());
+
+    // Any attempt to read from the file or write to it should now fail.
+    EXPECT_FALSE(csv->next(row));
+    EXPECT_THROW(csv->append(row_write), CSVFileError);
+
+    CSVRow row_write2(3);
+    row_write2.writeAt(0, "bird");
+    row_write2.writeAt(1, 3);
+    row_write2.writeAt(2, "purple");
+
+    // Reopen the file, seek to the end of file so as we can append
+    // some more data.
+    ASSERT_NO_THROW(csv->open(true));
+    // The file pointer should be at the end of file, so an attempt
+    //  to read should result in an empty row.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+    // We should be able to append new data.
+    ASSERT_NO_THROW(csv->append(row_write2));
+    ASSERT_NO_THROW(csv->flush());
+    csv->close();
+    // Check that new data has been appended.
+    EXPECT_EQ("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n"
+              "dog,2,blue\n"
+              "bird,3,purple\n",
+              readFile());
+}
+
+// This test checks that contents may be appended to a file which hasn't
+// been fully parsed/read.
+TEST_F(CSVFileTest, openReadPartialWrite) {
+    // Create a CSV file with two rows in it.
+    writeFile("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n");
+
+    // Open this file.
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    ASSERT_NO_THROW(csv->open());
+
+    // Read the first row.
+    CSVRow row0(0);
+    ASSERT_NO_THROW(csv->next(row0));
+    ASSERT_EQ(3, row0.getValuesCount());
+    EXPECT_EQ("cat", row0.readAt(0));
+    EXPECT_EQ("10", row0.readAt(1));
+    EXPECT_EQ("white", row0.readAt(2));
+
+    // There is still second row to be read. But, it should be possible to
+    // skip reading it and append new row to the end of file.
+    CSVRow row_write(3);
+    row_write.writeAt(0, "dog");
+    row_write.writeAt(1, 2);
+    row_write.writeAt(2, "blue");
+    ASSERT_NO_THROW(csv->append(row_write));
+
+    // At this point, the file pointer is at the end of file, so reading
+    // should return empty row.
+    CSVRow row1(0);
+    ASSERT_NO_THROW(csv->next(row1));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row1);
+
+    // Close the file.
+    ASSERT_NO_THROW(csv->flush());
+    csv->close();
+
+    // Check that there are two initial lines and one new there.
+    EXPECT_EQ("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n"
+              "dog,2,blue\n",
+              readFile());
+
+}
+
+// This test checks that the new CSV file is created and header
+// is written to it. It also checks that data rows can be
+// appended to it.
+TEST_F(CSVFileTest, recreate) {
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    csv->addColumn("animal");
+    csv->addColumn("color");
+    csv->addColumn("age");
+    csv->addColumn("comments");
+    ASSERT_NO_THROW(csv->recreate());
+    ASSERT_TRUE(exists());
+
+    CSVRow row0(4);
+    row0.writeAt(0, "dog");
+    row0.writeAt(1, "grey");
+    row0.writeAt(2, 3);
+    row0.writeAt(3, "nice one");
+    ASSERT_NO_THROW(csv->append(row0));
+
+    CSVRow row1(4);
+    row1.writeAt(0, "cat");
+    row1.writeAt(1, "black");
+    row1.writeAt(2, 2);
+    ASSERT_NO_THROW(csv->append(row1));
+
+    ASSERT_NO_THROW(csv->flush());
+    csv->close();
+
+    EXPECT_EQ("animal,color,age,comments\n"
+              "dog,grey,3,nice one\n"
+              "cat,black,2,\n",
+              readFile());
+}
+
+// This test checks that the error is reported when the size of the row being
+// read doesn't match the number of columns of the CSV file.
+TEST_F(CSVFileTest, validate) {
+    // Create CSV file with 2 invalid rows in it: one too long, one too short.
+    // Apart from that, there are two valid columns that should be read
+    // successfully.
+    writeFile("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow,black\n"
+              "dog,3,green\n"
+              "elephant,11\n");
+
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    ASSERT_NO_THROW(csv->open());
+    // First row is correct.
+    CSVRow row0;
+    ASSERT_TRUE(csv->next(row0));
+    EXPECT_EQ("cat", row0.readAt(0));
+    EXPECT_EQ("10", row0.readAt(1));
+    EXPECT_EQ("white", row0.readAt(2));
+    EXPECT_EQ("success", csv->getReadMsg());
+    // This row is too long.
+    CSVRow row1;
+    EXPECT_FALSE(csv->next(row1));
+    EXPECT_NE("success", csv->getReadMsg());
+    // This row is correct.
+    CSVRow row2;
+    ASSERT_TRUE(csv->next(row2));
+    EXPECT_EQ("dog", row2.readAt(0));
+    EXPECT_EQ("3", row2.readAt(1));
+    EXPECT_EQ("green", row2.readAt(2));
+    EXPECT_EQ("success", csv->getReadMsg());
+    // This row is too short.
+    CSVRow row3;
+    EXPECT_FALSE(csv->next(row3));
+    EXPECT_NE("success", csv->getReadMsg());
+}
+
+// Test test checks that exception is thrown when the header of the CSV file
+// parsed, doesn't match the columns specified.
+TEST_F(CSVFileTest, validateHeader) {
+    // Create CSV file with 3 columns.
+    writeFile("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow,black\n");
+
+    // Invalid order of columns.
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    csv->addColumn("color");
+    csv->addColumn("animal");
+    csv->addColumn("age");
+    EXPECT_THROW(csv->open(), CSVFileError);
+
+    // Too many columns.
+    csv.reset(new CSVFile(testfile_));
+    csv->addColumn("animal");
+    csv->addColumn("age");
+    csv->addColumn("color");
+    csv->addColumn("notes");
+    EXPECT_THROW(csv->open(), CSVFileError);
+
+    // Too few columns.
+    csv.reset(new CSVFile(testfile_));
+    csv->addColumn("animal");
+    csv->addColumn("age");
+    EXPECT_THROW(csv->open(), CSVFileError);
+}
+
+// This test checks that the exists method of the CSVFile class properly
+// checks that the file exists.
+TEST_F(CSVFileTest, exists) {
+    // Create a new CSV file that contains a header and two data rows.
+    writeFile("animal,age,color\n"
+              "cat,10,white\n"
+              "lion,15,yellow\n");
+
+    boost::scoped_ptr<CSVFile> csv(new CSVFile(testfile_));
+    // The CSVFile class should return true even if the file hasn't been
+    // opened.
+    EXPECT_TRUE(csv->exists());
+    // Now open the file and make sure it still returns true.
+    ASSERT_NO_THROW(csv->open());
+    EXPECT_TRUE(csv->exists());
+
+    // Close the file and remove it.
+    csv->close();
+    EXPECT_EQ(0, removeFile());
+
+    // The file should not exist.
+    EXPECT_FALSE(csv->exists());
+}
+
+// Check that a single header without a trailing blank line can be parsed.
+TEST_F(CSVFileTest, parseHeaderWithoutTrailingBlankLine) {
+    // Create a new CSV file that only contains a header without a new line.
+    writeFile("animal,age,color");
+
+    // Open this file and check that the header is parsed.
+    CSVFile csv(testfile_);
+    ASSERT_NO_THROW(csv.open());
+    ASSERT_EQ(3, csv.getColumnCount());
+    EXPECT_EQ("animal", csv.getColumnName(0));
+    EXPECT_EQ("age", csv.getColumnName(1));
+    EXPECT_EQ("color", csv.getColumnName(2));
+
+    // Attempt to read the next row which doesn't exist.
+    CSVRow row;
+    ASSERT_TRUE(csv.next(row));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+
+    // Close the file.
+    csv.close();
+}
+
+// Check that content without a trailing blank line can be parsed.
+TEST_F(CSVFileTest, parseContentWithoutTrailingBlankLine) {
+    // Now create a new CSV file that contains header plus data, but the last
+    // line is missing a new line.
+    writeFile("animal,age,color\n"
+              "cat,4,white\n"
+              "lion,8,yellow");
+
+    // Open this file and check that the header is parsed.
+    CSVFile csv(testfile_);
+    ASSERT_NO_THROW(csv.open());
+    ASSERT_EQ(3, csv.getColumnCount());
+    EXPECT_EQ("animal", csv.getColumnName(0));
+    EXPECT_EQ("age", csv.getColumnName(1));
+    EXPECT_EQ("color", csv.getColumnName(2));
+
+    // Check the first data row.
+    CSVRow row;
+    ASSERT_TRUE(csv.next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("4", row.readAt(1));
+    EXPECT_EQ("white", row.readAt(2));
+    EXPECT_EQ("success", csv.getReadMsg());
+
+    // Check the second data row.
+    ASSERT_TRUE(csv.next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("8", row.readAt(1));
+    EXPECT_EQ("yellow", row.readAt(2));
+    EXPECT_EQ("success", csv.getReadMsg());
+
+    // Attempt to read the next row which doesn't exist.
+    ASSERT_TRUE(csv.next(row));
+    EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+
+    // Close the file.
+    csv.close();
+}
+
+// Check that blank lines are skipped when reading from a file.
+TEST_F(CSVFileTest, parseContentWithBlankLines) {
+    for (char const* const& content : {
+        // Single intermediary blank line
+        "animal,age,color\n"
+        "cat,4,white\n"
+        "\n"
+        "lion,8,yellow\n",
+
+        // Blank lines all over
+        "\n"
+        "\n"
+        "animal,age,color\n"
+        "\n"
+        "\n"
+        "cat,4,white\n"
+        "\n"
+        "\n"
+        "lion,8,yellow\n"
+        "\n"
+        "\n",
+    }) {
+        // Create a new CSV file.
+        writeFile(content);
+
+        // Open this file and check that the header is parsed.
+        CSVFile csv(testfile_);
+        ASSERT_NO_THROW(csv.open());
+        ASSERT_EQ(3, csv.getColumnCount());
+        EXPECT_EQ("animal", csv.getColumnName(0));
+        EXPECT_EQ("age", csv.getColumnName(1));
+        EXPECT_EQ("color", csv.getColumnName(2));
+
+        // Check the first data row.
+        CSVRow row;
+        ASSERT_TRUE(csv.next(row));
+        EXPECT_EQ("cat", row.readAt(0));
+        EXPECT_EQ("4", row.readAt(1));
+        EXPECT_EQ("white", row.readAt(2));
+        EXPECT_EQ("success", csv.getReadMsg());
+
+        // Check the second non-blank data row.
+        ASSERT_TRUE(csv.next(row));
+        EXPECT_EQ("lion", row.readAt(0));
+        EXPECT_EQ("8", row.readAt(1));
+        EXPECT_EQ("yellow", row.readAt(2));
+        EXPECT_EQ("success", csv.getReadMsg());
+
+        // Attempt to read the next row which doesn't exist.
+        ASSERT_TRUE(csv.next(row));
+        EXPECT_EQ(CSVFile::EMPTY_ROW(), row);
+
+        // Close the file.
+        csv.close();
+    }
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/dhcp_space_unittest.cc b/src/lib/util/tests/dhcp_space_unittest.cc
new file mode 100644
index 0000000..e5269c4
--- /dev/null
+++ b/src/lib/util/tests/dhcp_space_unittest.cc
@@ -0,0 +1,32 @@
+// Copyright (C) 2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/dhcp_space.h>
+
+#include <cstring>
+
+#include <gtest/gtest.h>
+
+namespace {
+
+using namespace isc::util;
+
+TEST(DhcpSpace, cString) {
+    EXPECT_EQ(std::strcmp(cStringDhcpSpace<DHCPv4>(), "4"), 0);
+    EXPECT_EQ(std::strcmp(cStringDhcpSpace<DHCPv6>(), "6"), 0);
+}
+
+TEST(DhcpSpace, format) {
+    EXPECT_EQ(formatDhcpSpace<DHCPv4>("dhcp{}"), "dhcp4");
+    EXPECT_EQ(formatDhcpSpace<DHCPv6>("dhcp{}"), "dhcp6");
+
+    EXPECT_EQ(formatDhcpSpace<DHCPv4>("Dhcp{}.subnet{}"), "Dhcp4.subnet4");
+    EXPECT_EQ(formatDhcpSpace<DHCPv6>("Dhcp{}.subnet{}"), "Dhcp6.subnet6");
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/doubles_unittest.cc b/src/lib/util/tests/doubles_unittest.cc
new file mode 100644
index 0000000..1c17f90
--- /dev/null
+++ b/src/lib/util/tests/doubles_unittest.cc
@@ -0,0 +1,32 @@
+// Copyright (C) 2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/doubles.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+// Exercises isc::util::areDoublesEquivalent().
+TEST(Doubles, areDoublesEquivalent) {
+    std::vector<uint8_t> data;
+
+    // Default tolerance is 0.000001
+    EXPECT_TRUE(areDoublesEquivalent( 1.0000000, 1.0000005));
+    EXPECT_FALSE(areDoublesEquivalent(1.0000000, 1.000005));
+
+    // Check custom tolerance.
+    EXPECT_TRUE(areDoublesEquivalent( 1.000, 1.005, 0.01));
+    EXPECT_FALSE(areDoublesEquivalent(1.000, 1.005, 0.001));
+}
+
+}
diff --git a/src/lib/util/tests/encode_unittest.cc b/src/lib/util/tests/encode_unittest.cc
new file mode 100644
index 0000000..c39beb6
--- /dev/null
+++ b/src/lib/util/tests/encode_unittest.cc
@@ -0,0 +1,395 @@
+// Copyright (C) 2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <util/encode/encode.h>
+#include <testutils/gtest_utils.h>
+
+#include <gtest/gtest.h>
+#include <boost/algorithm/string.hpp>
+#include <boost/shared_ptr.hpp>
+
+#include <vector>
+#include <functional>
+
+using namespace std;
+using namespace isc;
+using namespace isc::util::encode;
+
+namespace {
+
+/// @brief Defines a pointer to BaseNEncoder instances.
+typedef boost::shared_ptr<BaseNEncoder> BaseNEncoderPtr;
+
+/// @brief Defines an encoding function.
+typedef std::function<std::string (const std::vector<uint8_t>&)> EncodeFunc;
+
+/// @brief Defines a decoding function.
+typedef std::function<void (const std::string&, std::vector<uint8_t>&)> DecodeFunc;
+
+/// @brief Test fixture for exercising BaseNEncoder derivatives.
+class EncodeDecodeTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    ///
+    /// @param encoder pointer to an encoder instance to use in tests
+    /// @param encode_func encoding function to test
+    /// @param decode_func decoding function to test
+    EncodeDecodeTest(BaseNEncoderPtr encoder, EncodeFunc encode_func, DecodeFunc decode_func)
+        : encoder_(encoder), encode_func_(encode_func), decode_func_(decode_func) {
+        // From RFC4648 test vectors.
+        valid_input_strings_.push_back("");
+        valid_input_strings_.push_back("f");
+        valid_input_strings_.push_back("fo");
+        valid_input_strings_.push_back("foo");
+        valid_input_strings_.push_back("foob");
+        valid_input_strings_.push_back("fooba");
+        valid_input_strings_.push_back("foobar");
+    }
+
+    /// @brief Destructor
+    ~EncodeDecodeTest() = default;
+
+    /// @brief Verifies encoding and decoding of test vectors from RFC4648
+    ///
+    /// Tests encoding and decoding functions using RFC supplied test vectors
+    /// by:
+    /// -# Encoding an input string and verifying the output against the expected
+    /// encoded string.
+    /// -# Decoding the encoded output and verifying it against the original input
+    /// string
+    /// -# If the algorithm is case sensitive, convert the encoded output string to
+    /// lower case and recheck that it is decoded properly
+    void encodeDecode() {
+        ASSERT_EQ(expected_encoded_strings_.size(), valid_input_strings_.size());
+        // For each valid input string:
+        // -# encode it and verify the encoded result is as expected
+        // -# decode the encoded result and verify it yields the original valid
+        // input string
+        // -# convert the encoded result to lower case and verify decoding
+        // yields correct result.
+        auto expected_output_str = expected_encoded_strings_.begin();
+        for (auto const& input : valid_input_strings_) {
+            std::vector<uint8_t>input_data(input.begin(), input.end());
+            std::string output_str;
+            ASSERT_NO_THROW_LOG(output_str = (encode_func_)(input_data));
+            ASSERT_EQ(output_str, *expected_output_str) << "input string: [" <<  input << "]";
+            ++expected_output_str;
+
+            std::vector<uint8_t> decoded_output;
+            ASSERT_NO_THROW_LOG((decode_func_)(output_str, decoded_output));
+            ASSERT_EQ(decoded_output, input_data);
+
+            if (!encoder_->isCaseSensitive()) {
+                const std::string lower_case_str = boost::algorithm::to_lower_copy(output_str);
+                decoded_output.clear();
+                ASSERT_NO_THROW_LOG((decode_func_)(lower_case_str, decoded_output));
+                ASSERT_EQ(decoded_output, input_data);
+            }
+        }
+    }
+
+    /// @brief Verifies that a list of encoded strings produces the expected
+    /// decoded results.
+    ///
+    /// @param encoded_strings list of encoded strings to decode
+    /// @param expected_strings list of expected decoded data as strings
+    void decode(std::vector<std::string>& encoded_strings,
+                std::vector<std::string>& expected_strings) {
+
+        ASSERT_EQ(encoded_strings.size(), expected_strings.size());
+        auto expected_str = expected_strings.begin();
+        for (auto const& encoded_str : encoded_strings) {
+            std::vector<uint8_t> decoded_output;
+            ASSERT_NO_THROW_LOG((decode_func_)(encoded_str, decoded_output));
+            std::string tmp(decoded_output.begin(), decoded_output.end());
+            EXPECT_EQ(tmp, *expected_str);
+            ++expected_str;
+        }
+    }
+
+    /// @brief Verifies that a list of invalid encoded strings fail to
+    /// decode appropriately
+    ///
+    /// @param encoded_strings list of invalid encoded strings
+    void decodeInvalid(std::vector<std::string>& encoded_strings) {
+        for (auto const& encoded_str : encoded_strings) {
+            std::vector<uint8_t> decoded_output;
+            EXPECT_THROW((decode_func_)(encoded_str, decoded_output), BadValue);
+        }
+    }
+
+    /// @brief Verifies the integrity to encoder's digit set and bit table.
+    void mapTest() {
+        size_t num_digits = strlen(encoder_->getDigitSet());
+        size_t whitespaces = 0;
+        size_t valid_digits = 0;
+        size_t bad_chars = 0;
+        size_t pad_chars = 0;
+        size_t upper_cased = 0;
+
+        auto pad_char = encoder_->getPadChar();
+
+        // Ensure the bit table is the proper size.
+        ASSERT_EQ(encoder_->getBitsTable().size(), 256);
+
+        // Iterate over the whole ASCII character set:
+        // 1. Convert the ASCII value to its encoded binary bit value.
+        // 2. Classify the value as whitespace, invalid, pad or valid
+        // 3. For valid digits verify they exist in the digit set
+        for (uint16_t ascii = 0; ascii < 256; ++ascii) {
+            // Look up the binary data for the digit.
+            // No value under 256 should throw.
+            uint8_t bits;
+            ASSERT_NO_THROW_LOG(bits = encoder_->digitToBits(ascii));
+
+            // Classify the bits value we found.
+            switch(bits) {
+            case 0xee:
+                ASSERT_TRUE(isspace(ascii));
+                ++whitespaces;
+                break;
+            case 0xff:
+                ++bad_chars;
+                break;
+            default: {
+                if (pad_char && ascii == pad_char) {
+                    ++pad_chars;
+                } else {
+                    // Verify the ascii value is in the digit set.
+                    if (encoder_->isCaseSensitive()) {
+                        ASSERT_TRUE(strchr(encoder_->getDigitSet(), ascii))
+                                 << "ascii: " << std::hex << ascii;
+                        ++valid_digits;
+                    } else {
+                        auto check_ascii = toupper(ascii);
+                        ASSERT_TRUE(strchr(encoder_->getDigitSet(), check_ascii))
+                                 << "ascii: " << std::hex << ascii
+                                 << " check_ascii: " << std::hex << check_ascii;
+
+                        if (check_ascii == ascii){
+                            ++valid_digits;
+                        } else {
+                            ++upper_cased;
+                        }
+                    }
+                }
+
+                break;
+            }}
+        }
+
+        // Verify that we see all valid digits.
+        EXPECT_EQ(valid_digits, num_digits);
+
+        // Verify that all of the ASCII values are accounted for.
+        EXPECT_EQ((valid_digits + upper_cased + whitespaces + bad_chars + pad_chars), 256)
+            << " : " << valid_digits
+            << " + " << upper_cased
+            << " + " << whitespaces
+            << " + " << bad_chars
+            << " + " << pad_chars;
+    }
+
+    BaseNEncoderPtr encoder_;
+    EncodeFunc encode_func_;
+    DecodeFunc decode_func_;
+    std::vector<std::string> valid_input_strings_;
+    std::vector<std::string> expected_encoded_strings_;
+};
+
+
+/// @brief Test Fixture for Base64 encoding
+class Base64Test : public EncodeDecodeTest {
+public:
+    Base64Test()
+     : EncodeDecodeTest(BaseNEncoderPtr(new Base64Encoder()), encodeBase64, decodeBase64) {
+        // From RFC4648 test vectors.
+        expected_encoded_strings_.push_back("");
+        expected_encoded_strings_.push_back("Zg==");
+        expected_encoded_strings_.push_back("Zm8=");
+        expected_encoded_strings_.push_back("Zm9v");
+        expected_encoded_strings_.push_back("Zm9vYg==");
+        expected_encoded_strings_.push_back("Zm9vYmE=");
+        expected_encoded_strings_.push_back("Zm9vYmFy");
+    }
+};
+
+/// @brief Test Fixture for Base32Hex encoding
+class Base32HexTest : public EncodeDecodeTest {
+public:
+    Base32HexTest()
+     : EncodeDecodeTest(BaseNEncoderPtr(new Base32HexEncoder()), encodeBase32Hex, decodeBase32Hex) {
+        // From RFC4648 test vectors.
+        expected_encoded_strings_.push_back("");
+        expected_encoded_strings_.push_back("CO======");
+        expected_encoded_strings_.push_back("CPNG====");
+        expected_encoded_strings_.push_back("CPNMU===");
+        expected_encoded_strings_.push_back("CPNMUOG=");
+        expected_encoded_strings_.push_back("CPNMUOJ1");
+        expected_encoded_strings_.push_back("CPNMUOJ1E8======");
+    }
+};
+
+/// @brief Test Fixture for Base16 encoding
+class Base16Test : public EncodeDecodeTest {
+public:
+    Base16Test()
+     : EncodeDecodeTest(BaseNEncoderPtr(new Base16Encoder()), encodeHex, decodeHex) {
+        // From RFC4648 test vectors.
+        expected_encoded_strings_.push_back("");
+        expected_encoded_strings_.push_back("66");
+        expected_encoded_strings_.push_back("666F");
+        expected_encoded_strings_.push_back("666F6F");
+        expected_encoded_strings_.push_back("666F6F62");
+        expected_encoded_strings_.push_back("666F6F6261");
+        expected_encoded_strings_.push_back("666F6F626172");
+    }
+};
+
+// Verify RFC test vectors for Base64
+TEST_F(Base64Test, validEncodeDecode) {
+    encodeDecode();
+}
+
+// Verify whitespaces are handled properly in Base64
+TEST_F(Base64Test, whiteSpace) {
+    std::vector<std::string> encoded_strings = {
+        "Zm 9v\tYmF\ny",
+        "Zm9vYg==",
+        "Zm9vYmE=\n",
+        " Zm9vYmE=\n",
+        " ",
+        "\n\t"
+    };
+
+    std::vector<std::string> expected_strings = {
+        "foobar",
+        "foob",
+        "fooba",
+        "fooba",
+        "",
+        ""
+    };
+
+    decode(encoded_strings, expected_strings);
+}
+
+// Verify invalid encodings are handled properly in Base64
+TEST_F(Base64Test, decodeInvalid) {
+    std::vector<std::string> encoded_strings = {
+        // Incomplete input.
+        "Zm9vYmF",
+        // Only up to 2 padding characters are allowed.
+        "A===",
+        "A= ==",
+        // Intermediate padding isn't allowed.
+        "YmE=YmE=",
+        // Non canonical form isn't allowed.
+        "Zm9=",
+        "Zm==",
+    };
+
+    decodeInvalid(encoded_strings);
+}
+
+// Verify mappings for Base64
+TEST_F(Base64Test, mappingCheck) {
+    mapTest();
+}
+
+// Verify RFC test vectors for Base32Hex
+TEST_F(Base32HexTest, validEncodeDecode) {
+    encodeDecode();
+}
+
+// Verify whitespaces are handled properly in Base32Hex
+TEST_F(Base32HexTest, whiteSpace) {
+    std::vector<std::string> encoded_strings = {
+        "CP NM\tUOG=",
+        "CPNMU===\n",
+        "  CP NM\tUOG=",
+        " "
+    };
+
+    std::vector<std::string> expected_strings = {
+        "foob",
+        "foo",
+        "foob",
+        ""
+    };
+
+    decode(encoded_strings, expected_strings);
+}
+
+// Verify invalid encodings are handled properly in Base32Hex
+TEST_F(Base32HexTest, decodeInvalid) {
+    std::vector<std::string> encoded_strings = {
+        // Incomplete input.
+        "CPNMUOJ",
+        // Invalid number of padding characters.
+        "CPNMU0==",
+        "CO0=====",
+        "CO=======",
+        // Intermediate padding isn't allowed.
+        "CPNMUOG=CPNMUOG=",
+        // Non canonical form isn't allowed.
+        "0P======"
+    };
+
+    decodeInvalid(encoded_strings);
+}
+
+// Verify mappings for Base32Hex
+TEST_F(Base32HexTest, mappingCheck) {
+    mapTest();
+}
+
+// Verify RFC test vectors for Base16
+TEST_F(Base16Test, validEncodeDecode) {
+    encodeDecode();
+}
+
+// Verify whitespaces are handled properly in Base16
+TEST_F(Base16Test, whiteSpace) {
+    std::vector<std::string> encoded_strings = {
+        "66 6F\t6F62",
+        "66 6F6F\n",
+        " 66\v\t6F6F62",
+        " "
+    };
+
+    std::vector<std::string> expected_strings = {
+        "foob",
+        "foo",
+        "foob",
+        ""
+    };
+
+    decode(encoded_strings, expected_strings);
+}
+
+// Verify invalid encodings are handled properly in Base16
+TEST_F(Base16Test, decodeInvalid) {
+    std::vector<std::string> encoded_strings = {
+        // Non hex digits should fail.
+        "lx",
+        // Encoded string must have an even number of characters.
+        "dea"
+    };
+
+    decodeInvalid(encoded_strings);
+}
+
+// Verify mappings for Base16
+TEST_F(Base16Test, mappingCheck) {
+    mapTest();
+}
+
+}
diff --git a/src/lib/util/tests/fd_share_tests.cc b/src/lib/util/tests/fd_share_tests.cc
new file mode 100644
index 0000000..f870ec2
--- /dev/null
+++ b/src/lib/util/tests/fd_share_tests.cc
@@ -0,0 +1,72 @@
+// Copyright (C) 2011-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/io/fd.h>
+#include <util/io/fd_share.h>
+
+#include <util/unittests/check_valgrind.h>
+#include <util/unittests/fork.h>
+
+#include <gtest/gtest.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <cstdio>
+
+using namespace isc::util::io;
+using namespace isc::util::unittests;
+
+namespace {
+
+// We test that we can transfer a pipe over other pipe
+TEST(FDShare, transfer) {
+
+    if (!isc::util::unittests::runningOnValgrind()) {
+        // Get a pipe and fork
+        int pipes[2];
+        ASSERT_NE(-1, socketpair(AF_UNIX, SOCK_STREAM, 0, pipes));
+        const pid_t sender(fork());
+        ASSERT_NE(-1, sender);
+        if (sender) { // We are in parent
+            // Close the other side of pipe, we want only writable one
+            EXPECT_NE(-1, close(pipes[0]));
+            // Get a process to check data
+            int fd(0);
+            const pid_t checker(check_output(&fd, "data", 4));
+            ASSERT_NE(-1, checker);
+            // Now, send the file descriptor, close it and close the pipe
+            EXPECT_NE(-1, send_fd(pipes[1], fd));
+            EXPECT_NE(-1, close(pipes[1]));
+            EXPECT_NE(-1, close(fd));
+            // Check both subprocesses ended well
+            EXPECT_TRUE(process_ok(sender));
+            EXPECT_TRUE(process_ok(checker));
+        } else { // We are in child. We do not use ASSERT here
+            // Close the write end, we only read
+            if (close(pipes[1])) {
+                exit(1);
+            }
+            // Get the file descriptor
+            const int fd(recv_fd(pipes[0]));
+            if (fd == -1) {
+                exit(1);
+            }
+            // This pipe is not needed
+            if (close(pipes[0])) {
+                exit(1);
+            }
+            // Send "data" through the received fd, close it and be done
+            if (!write_data(fd, "data", 4) || close(fd) == -1) {
+                exit(1);
+            }
+            exit(0);
+        }
+    }
+}
+
+}
diff --git a/src/lib/util/tests/fd_tests.cc b/src/lib/util/tests/fd_tests.cc
new file mode 100644
index 0000000..eee597c
--- /dev/null
+++ b/src/lib/util/tests/fd_tests.cc
@@ -0,0 +1,71 @@
+// Copyright (C) 2011-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/unittests/check_valgrind.h>
+
+#include <util/io/fd.h>
+
+#include <util/unittests/fork.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc::util::io;
+using namespace isc::util::unittests;
+
+namespace {
+
+// Make sure the test is large enough and does not fit into one
+// read or write request
+const size_t TEST_DATA_SIZE = 8 * 1024 * 1024;
+
+class FDTest : public ::testing::Test {
+public:
+    unsigned char *data, *buffer;
+
+    /// @brief Constructor
+    FDTest() :
+        // We do not care what is inside, we just need it to be the same
+        data(new unsigned char[TEST_DATA_SIZE]),
+        buffer(NULL) {
+        memset(data, 0, TEST_DATA_SIZE);
+    }
+
+    /// @brief Destructor
+    ~FDTest() {
+        delete[] data;
+        delete[] buffer;
+    }
+};
+
+// Test we read what was sent
+TEST_F(FDTest, read) {
+    if (!isc::util::unittests::runningOnValgrind()) {
+        int read_pipe(0);
+        buffer = new unsigned char[TEST_DATA_SIZE];
+        pid_t feeder(provide_input(&read_pipe, data, TEST_DATA_SIZE));
+        ASSERT_GE(feeder, 0);
+        ssize_t received(read_data(read_pipe, buffer, TEST_DATA_SIZE));
+        EXPECT_TRUE(process_ok(feeder));
+        EXPECT_EQ(TEST_DATA_SIZE, received);
+        EXPECT_EQ(0, memcmp(data, buffer, received));
+    }
+}
+
+// Test we write the correct thing
+TEST_F(FDTest, write) {
+    if (!isc::util::unittests::runningOnValgrind()) {
+        int write_pipe(0);
+        pid_t checker(check_output(&write_pipe, data, TEST_DATA_SIZE));
+        ASSERT_GE(checker, 0);
+        EXPECT_TRUE(write_data(write_pipe, data, TEST_DATA_SIZE));
+        EXPECT_EQ(0, close(write_pipe));
+        EXPECT_TRUE(process_ok(checker));
+    }
+}
+
+}
diff --git a/src/lib/util/tests/filesystem_unittests.cc b/src/lib/util/tests/filesystem_unittests.cc
new file mode 100644
index 0000000..548070a
--- /dev/null
+++ b/src/lib/util/tests/filesystem_unittests.cc
@@ -0,0 +1,125 @@
+// Copyright (C) 2015-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <testutils/gtest_utils.h>
+#include <util/filesystem.h>
+
+#include <fstream>
+#include <string>
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::util::file;
+using namespace std;
+
+namespace {
+
+/// @brief Test fixture class for testing operations on files.
+struct FileUtilTest : ::testing::Test {
+    /// @brief Destructor.
+    ///
+    /// Deletes the test file if any.
+    virtual ~FileUtilTest() {
+        string test_file_name(TEST_DATA_BUILDDIR "/fu.test");
+        static_cast<void>(remove(test_file_name.c_str()));
+    }
+};
+
+/// @brief Check that an error is returned by getContent on non-existent file.
+TEST_F(FileUtilTest, notExist) {
+    EXPECT_THROW_MSG(getContent("/does/not/exist"), BadValue,
+                     "Expected a file at path '/does/not/exist'");
+}
+
+/// @brief Check that an error is returned by getContent on not regular file.
+TEST_F(FileUtilTest, notRegular) {
+    EXPECT_THROW_MSG(getContent("/"), BadValue, "Expected '/' to be a regular file");
+}
+
+/// @brief Check getContent.
+TEST_F(FileUtilTest, getContent) {
+    string file_name(TEST_DATA_BUILDDIR "/fu.test");
+    ofstream fs(file_name.c_str(), ofstream::out | ofstream::trunc);
+    ASSERT_TRUE(fs.is_open());
+    fs << "abdc";
+    fs.close();
+    string content;
+    EXPECT_NO_THROW_LOG(content = getContent(file_name));
+    EXPECT_EQ("abdc", content);
+}
+
+/// @brief Check isDir.
+TEST_F(FileUtilTest, isDir) {
+    EXPECT_TRUE(isDir("/dev"));
+    EXPECT_FALSE(isDir("/dev/null"));
+    EXPECT_FALSE(isDir("/this/does/not/exist"));
+    EXPECT_FALSE(isDir("/etc/hosts"));
+}
+
+/// @brief Check isFile.
+TEST_F(FileUtilTest, isFile) {
+    EXPECT_TRUE(isFile(ABS_SRCDIR "/filesystem_unittests.cc"));
+    EXPECT_FALSE(isFile(TEST_DATA_BUILDDIR));
+}
+
+/// @brief Check that the components are split correctly.
+TEST(PathTest, components) {
+    // Complete name
+    Path fname("/alpha/beta/gamma.delta");
+    EXPECT_EQ("/alpha/beta/", fname.parentPath());
+    EXPECT_EQ("gamma", fname.stem());
+    EXPECT_EQ(".delta", fname.extension());
+    EXPECT_EQ("gamma.delta", fname.filename());
+}
+
+/// @brief Check replaceExtension.
+TEST(PathTest, replaceExtension) {
+    Path fname("a.b");
+
+    EXPECT_EQ("a", fname.replaceExtension("").str());
+    EXPECT_EQ("a.f", fname.replaceExtension(".f").str());
+    EXPECT_EQ("a.f", fname.replaceExtension("f").str());
+    EXPECT_EQ("a./c/d/", fname.replaceExtension(" /c/d/  ").str());
+    EXPECT_EQ("a.f", fname.replaceExtension("/c/d/e.f").str());
+    EXPECT_EQ("a.f", fname.replaceExtension("e.f").str());
+}
+
+/// @brief Check replaceParentPath.
+TEST(PathTest, replaceParentPath) {
+    Path fname("a.b");
+    EXPECT_EQ("", fname.parentPath());
+    EXPECT_EQ("a.b", fname.str());
+
+    fname.replaceParentPath("/just/some/dir/");
+    EXPECT_EQ("/just/some/dir/", fname.parentPath());
+    EXPECT_EQ("/just/some/dir/a.b", fname.str());
+
+    fname.replaceParentPath("/just/some/dir");
+    EXPECT_EQ("/just/some/dir/", fname.parentPath());
+    EXPECT_EQ("/just/some/dir/a.b", fname.str());
+
+    fname.replaceParentPath("/");
+    EXPECT_EQ("/", fname.parentPath());
+    EXPECT_EQ("/a.b", fname.str());
+
+    fname.replaceParentPath("");
+    EXPECT_EQ("", fname.parentPath());
+    EXPECT_EQ("a.b", fname.str());
+
+    fname = Path("/first/a.b");
+    EXPECT_EQ("/first/", fname.parentPath());
+    EXPECT_EQ("/first/a.b", fname.str());
+
+    fname.replaceParentPath("/just/some/dir");
+    EXPECT_EQ("/just/some/dir/", fname.parentPath());
+    EXPECT_EQ("/just/some/dir/a.b", fname.str());
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/hash_unittest.cc b/src/lib/util/tests/hash_unittest.cc
new file mode 100644
index 0000000..f789e51
--- /dev/null
+++ b/src/lib/util/tests/hash_unittest.cc
@@ -0,0 +1,34 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/hash.h>
+
+#include <gtest/gtest.h>
+
+#include <cstring>
+#include <vector>
+
+using namespace isc::util;
+using namespace std;
+
+namespace {
+
+TEST(HashTest, empty) {
+    EXPECT_EQ(14695981039346656037ull, Hash64::hash(0, 0));
+}
+
+TEST(HashTest, foobar) {
+    EXPECT_EQ(9625390261332436968ull, Hash64::hash(string("foobar")));
+}
+
+TEST(HashTest, chongo) {
+    EXPECT_EQ(5080352029159061781ull,
+              Hash64::hash(string("chongo was here!\n")));
+}
+
+}
diff --git a/src/lib/util/tests/io_unittests.cc b/src/lib/util/tests/io_unittests.cc
new file mode 100644
index 0000000..320060f
--- /dev/null
+++ b/src/lib/util/tests/io_unittests.cc
@@ -0,0 +1,236 @@
+// Copyright (C) 2011-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// \brief Test of asiolink utilities
+///
+/// Tests the functionality of the asiolink utilities code by comparing them
+/// with the equivalent methods in isc::dns::[Input/Output]Buffer.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <util/buffer.h>
+#include <util/io.h>
+
+#include <bitset>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
+#include <arpa/inet.h>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::util;
+using namespace std;
+
+namespace {
+
+struct ReadWriteUintTest : ::testing::Test {
+    template <typename uint_t>
+    string showDiff(uint_t const left, uint8_t* const right) {
+        bitset<8 * sizeof(uint_t)> const bitset_left(left);
+        bitset<8 * sizeof(uint_t)> const bitset_right(*(reinterpret_cast<uint_t*>(right)));
+        string const bitstring_left(separateBytes(bitset_left.to_string()));
+        string const bitstring_right(separateBytes(bitset_right.to_string()));
+        string const diff(::testing::internal::edit_distance::CreateUnifiedDiff({bitstring_left},
+                                                                                {bitstring_right}));
+        return (diff);
+    }
+
+private:
+    string separateBytes(string const& input) {
+        size_t const position(8);
+        stringstream ss;
+        for (size_t i = 0; i < input.size(); i = i + position) {
+            if (i) {
+                ss << " ";
+            }
+            ss << input.substr(i, position);
+        }
+        return (ss.str());
+    }
+};
+
+/// @brief Check whether uint16_t can be read from a buffer properly.
+TEST_F(ReadWriteUintTest, readUint16) {
+    uint16_t const test16[] = {0, 1, 2000, 0x8000, 0xffff};
+    uint8_t data[] = {0, 0, 0, 0};
+
+    // Make sure that we can read data, regardless of the memory alignment.
+    // That is why we need to repeat it 2 times.
+    for (size_t offset = 0; offset < sizeof(uint16_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test16) / sizeof(uint16_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint16_t tmp = htons(test16[i]);
+            memcpy(&data[offset], &tmp, sizeof(uint16_t));
+
+            EXPECT_EQ(test16[i], readUint16(&data[offset], sizeof(uint16_t)));
+        }
+    }
+}
+
+/// @brief Check whether reading an uint16_t results in an exception.
+TEST_F(ReadWriteUintTest, readUint16OutOfRange) {
+    uint8_t data[] = {0};
+    EXPECT_THROW_MSG(readUint16(data, 1), OutOfRange,
+                     "Expected buffer to be long enough to read a 2-byte integer, but got 1 byte "
+                     "instead");
+}
+
+/// @brief Check whether uint16_t can be written to a buffer properly.
+TEST_F(ReadWriteUintTest, writeUint16) {
+    uint16_t const test16[] = {0, 1, 2000, 0x8000, 0xffff};
+    uint8_t data[4];
+
+    // Make sure that we can write data, regardless of the memory alignment.
+    // That's why we need to repeat 2 times.
+    for (size_t offset = 0; offset < sizeof(uint16_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test16) / sizeof(uint16_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint8_t* ptr = writeUint16(test16[i], &data[offset], sizeof(uint16_t));
+
+            EXPECT_EQ(&data[offset] + sizeof(uint16_t), ptr);
+
+            uint16_t tmp = htons(test16[i]);
+
+            EXPECT_EQ(0, memcmp(&tmp, &data[offset], sizeof(uint16_t)))
+                << showDiff(tmp, &data[offset]);
+        }
+    }
+}
+
+/// @brief Check whether writing an uint16_t results in an exception.
+TEST_F(ReadWriteUintTest, writeUint16OutOfRange) {
+    uint16_t i16 = 42;
+    uint8_t data[1];
+    EXPECT_THROW_MSG(writeUint16(i16, data, sizeof(data)), OutOfRange,
+                     "Expected buffer to be long enough to write a 2-byte integer, but got 1 byte "
+                     "instead");
+}
+
+/// @brief Check whether uint32_t can be read from a buffer properly.
+TEST_F(ReadWriteUintTest, readUint32) {
+    uint32_t const test32[] = {0, 1, 2000, 0x80000000, 0xffffffff};
+    uint8_t data[] = {0, 0, 0, 0, 0, 0, 0, 0};
+
+    // Make sure that we can read data, regardless of the memory alignment.
+    // That is why we need to repeat it 4 times.
+    for (size_t offset = 0; offset < sizeof(uint32_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test32) / sizeof(uint32_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint32_t tmp = htonl(test32[i]);
+            memcpy(&data[offset], &tmp, sizeof(uint32_t));
+
+            EXPECT_EQ(test32[i], readUint32(&data[offset], sizeof(uint32_t)));
+        }
+    }
+}
+
+/// @brief Check whether reading an uint32_t results in an exception.
+TEST_F(ReadWriteUintTest, readUint32OutOfRange) {
+    uint8_t data[] = {0, 0, 0};
+    EXPECT_THROW_MSG(readUint32(data, 3), OutOfRange,
+                     "Expected buffer to be long enough to read a 4-byte integer, but got 3 bytes "
+                     "instead");
+}
+
+/// @brief Check whether uint32_t can be written to a buffer properly.
+TEST_F(ReadWriteUintTest, writeUint32) {
+    uint32_t const test32[] = {0, 1, 2000, 0x80000000, 0xffffffff};
+    uint8_t data[8];
+
+    // Make sure that we can write data, regardless of the memory alignment.
+    // That's why we need to repeat 4 times.
+    for (size_t offset = 0; offset < sizeof(uint32_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test32) / sizeof(uint32_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint8_t* ptr = writeUint32(test32[i], &data[offset], sizeof(uint32_t));
+
+            EXPECT_EQ(&data[offset] + sizeof(uint32_t), ptr);
+
+            uint32_t tmp = htonl(test32[i]);
+
+            EXPECT_EQ(0, memcmp(&tmp, &data[offset], sizeof(uint32_t)))
+                << showDiff(tmp, &data[offset]);
+        }
+    }
+}
+
+/// @brief Check whether writing an uint32_t results in an exception.
+TEST_F(ReadWriteUintTest, writeUint32OutOfRange) {
+    uint32_t i32 = 28;
+    uint8_t data[3];
+    EXPECT_THROW_MSG(writeUint32(i32, data, sizeof(data)), OutOfRange,
+                     "Expected buffer to be long enough to write a 4-byte integer, but got 3 bytes "
+                     "instead");
+}
+
+/// @brief Check whether uint64_t can be read from a buffer properly.
+TEST_F(ReadWriteUintTest, readUint64) {
+    uint64_t const test64[] = {0, 1, 2000, 0x80000000, 0xffffffff, 0xfffffffffffffff};
+    uint8_t data[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+
+    // Make sure that we can read data, regardless of the memory alignment.
+    // That is why we need to repeat it 8 times.
+    for (size_t offset = 0; offset < sizeof(uint64_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test64) / sizeof(uint64_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint64_t tmp = (uint64_t(htonl(test64[i])) << 32) | htonl(test64[i] >> 32);
+            memcpy(&data[offset], &tmp, sizeof(uint64_t));
+
+            EXPECT_EQ(test64[i], readUint64(&data[offset], sizeof(uint64_t)));
+        }
+    }
+}
+
+/// @brief Check whether reading an uint64_t results in an exception.
+TEST_F(ReadWriteUintTest, readUint64OutOfRange) {
+    uint8_t buf[] = {0, 0, 0, 0, 0, 0, 0};
+
+    EXPECT_THROW_MSG(readUint64(buf, 7), OutOfRange,
+                     "Expected buffer to be long enough to read a 8-byte integer, but got 7 bytes "
+                     "instead");
+}
+
+/// @brief Check whether uint64 can be written to a buffer properly.
+TEST_F(ReadWriteUintTest, writeUint64) {
+    uint64_t const test64[] = {0, 1, 2000, 0x80000000, 0xffffffff, 0xfffffffffffffff};
+    uint8_t data[16];
+
+    // Make sure that we can write data, regardless of the memory alignment.
+    // That's why we need to repeat 8 times.
+    for (size_t offset = 0; offset < sizeof(uint64_t); ++offset) {
+        for (size_t i = 0; i < sizeof(test64) / sizeof(uint64_t); ++i) {
+            SCOPED_TRACE("offset " + to_string(offset) + ", iteration " + to_string(i));
+
+            uint8_t* ptr = writeUint64(test64[i], &data[offset], sizeof(uint64_t));
+
+            EXPECT_EQ(&data[offset] + sizeof(uint64_t), ptr);
+
+            uint64_t tmp = (uint64_t(htonl(test64[i])) << 32) | htonl(test64[i] >> 32);
+
+            EXPECT_EQ(0, memcmp(&tmp, &data[offset], sizeof(uint64_t)))
+                << showDiff(tmp, &data[offset]);
+        }
+    }
+}
+
+/// @brief Check whether writing an uint64_t results in an exception.
+TEST_F(ReadWriteUintTest, writeUint64OutOfRange) {
+    uint64_t i64 = 28;
+    uint8_t data[7];
+    EXPECT_THROW_MSG(writeUint64(i64, data, sizeof(data)), OutOfRange,
+                     "Expected buffer to be long enough to write a 8-byte integer, but got 7 bytes "
+                     "instead");
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/labeled_value_unittest.cc b/src/lib/util/tests/labeled_value_unittest.cc
new file mode 100644
index 0000000..c994156
--- /dev/null
+++ b/src/lib/util/tests/labeled_value_unittest.cc
@@ -0,0 +1,101 @@
+// Copyright (C) 2013-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/labeled_value.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Verifies basic construction and accessors for LabeledValue.
+TEST(LabeledValue, construction) {
+    /// Verify that an empty label is not allowed.
+    ASSERT_THROW(LabeledValue(1, ""), LabeledValueError);
+
+    /// Verify that a valid constructor works.
+    LabeledValuePtr lvp;
+    ASSERT_NO_THROW(lvp.reset(new LabeledValue(1, "NotBlank")));
+    ASSERT_TRUE(lvp);
+
+    // Verify that the value can be accessed.
+    EXPECT_EQ(1, lvp->getValue());
+
+    // Verify that the label can be accessed.
+    EXPECT_EQ("NotBlank", lvp->getLabel());
+}
+
+/// @brief Verifies the logical operators defined for LabeledValue.
+TEST(LabeledValue, operators) {
+    LabeledValuePtr lvp1;
+    LabeledValuePtr lvp1Also;
+    LabeledValuePtr lvp2;
+
+    // Create three instances, two of which have the same numeric value.
+    ASSERT_NO_THROW(lvp1.reset(new LabeledValue(1, "One")));
+    ASSERT_NO_THROW(lvp1Also.reset(new LabeledValue(1, "OneAlso")));
+    ASSERT_NO_THROW(lvp2.reset(new LabeledValue(2, "Two")));
+
+    // Verify each of the operators.
+    EXPECT_TRUE(*lvp1 == *lvp1Also);
+    EXPECT_TRUE(*lvp1 != *lvp2);
+    EXPECT_TRUE(*lvp1 < *lvp2);
+    EXPECT_FALSE(*lvp2 < *lvp1);
+}
+
+/// @brief Verifies the default constructor for LabeledValueSet.
+TEST(LabeledValueSet, construction) {
+    ASSERT_NO_THROW (LabeledValueSet());
+}
+
+/// @brief Verifies the basic operations of a LabeledValueSet.
+/// Essentially we verify that we can define a set of valid entries and
+/// look them up without issue.
+TEST(LabeledValueSet, basicOperation) {
+    const char* labels[] = {"Zero", "One", "Two", "Three" };
+    LabeledValueSet lvset;
+    LabeledValuePtr lvp;
+
+    // Verify the we cannot add an empty pointer to the set.
+    EXPECT_THROW(lvset.add(lvp), LabeledValueError);
+
+    // Verify that we can add an entry to the set via pointer.
+    ASSERT_NO_THROW(lvp.reset(new LabeledValue(0, labels[0])));
+    EXPECT_NO_THROW(lvset.add(lvp));
+
+    // Verify that we cannot add a duplicate entry.
+    EXPECT_THROW(lvset.add(lvp), LabeledValueError);
+
+    // Add the remaining entries using add(int,char*) variant.
+    for (int i = 1; i < 3; i++) {
+        EXPECT_NO_THROW(lvset.add(i, labels[i]));
+    }
+
+    // Verify that we can't add a duplicate entry this way either.
+    EXPECT_THROW ((lvset.add(0, labels[0])), LabeledValueError);
+
+    // Verify that we can look up all of the defined entries properly.
+    for (int i = 1; i < 3; i++) {
+        EXPECT_TRUE(lvset.isDefined(i));
+        EXPECT_NO_THROW(lvp = lvset.get(i));
+        EXPECT_EQ(lvp->getValue(), i);
+        EXPECT_EQ(lvp->getLabel(), labels[i]);
+        EXPECT_EQ(lvset.getLabel(i), labels[i]);
+    }
+
+    // Verify behavior for a value that is not defined.
+    EXPECT_FALSE(lvset.isDefined(4));
+    EXPECT_NO_THROW(lvp = lvset.get(4));
+    EXPECT_FALSE(lvp);
+    EXPECT_EQ(lvset.getLabel(4), LabeledValueSet::UNDEFINED_LABEL);
+}
+
+}
diff --git a/src/lib/util/tests/memory_segment_common_unittest.cc b/src/lib/util/tests/memory_segment_common_unittest.cc
new file mode 100644
index 0000000..f95021d
--- /dev/null
+++ b/src/lib/util/tests/memory_segment_common_unittest.cc
@@ -0,0 +1,100 @@
+// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/memory_segment.h>
+
+#include <exceptions/exceptions.h>
+
+#include <gtest/gtest.h>
+
+#include <cstring>
+#include <stdint.h>
+
+namespace isc {
+namespace util {
+namespace test {
+
+void
+checkSegmentNamedAddress(MemorySegment& segment, bool out_of_segment_ok) {
+    // NULL name is not allowed.
+    EXPECT_THROW(segment.getNamedAddress(NULL), InvalidParameter);
+
+    // If the name does not exist, false should be returned.
+    EXPECT_FALSE(segment.getNamedAddress("test address").first);
+
+    // Now set it
+    void* ptr32 = segment.allocate(sizeof(uint32_t));
+    const uint32_t test_val = 42;
+    *static_cast<uint32_t*>(ptr32) = test_val;
+    EXPECT_FALSE(segment.setNamedAddress("test address", ptr32));
+
+    // NULL name isn't allowed.
+    EXPECT_THROW(segment.setNamedAddress(NULL, ptr32), InvalidParameter);
+    EXPECT_THROW(segment.getNamedAddress(NULL), InvalidParameter);
+    EXPECT_THROW(segment.clearNamedAddress(NULL), InvalidParameter);
+
+    // Empty names are not allowed.
+    EXPECT_THROW(segment.setNamedAddress("", ptr32), InvalidParameter);
+    EXPECT_THROW(segment.getNamedAddress(""), InvalidParameter);
+    EXPECT_THROW(segment.clearNamedAddress(""), InvalidParameter);
+
+    // Names beginning with _ are not allowed.
+    EXPECT_THROW(segment.setNamedAddress("_foo", ptr32), InvalidParameter);
+    EXPECT_THROW(segment.getNamedAddress("_foo"), InvalidParameter);
+    EXPECT_THROW(segment.clearNamedAddress("_foo"), InvalidParameter);
+
+    // we can now get it; the stored value should be intact.
+    MemorySegment::NamedAddressResult result =
+        segment.getNamedAddress("test address");
+    EXPECT_TRUE(result.first);
+    EXPECT_EQ(test_val, *static_cast<const uint32_t*>(result.second));
+
+    // Override it.
+    void* ptr16 = segment.allocate(sizeof(uint16_t));
+    const uint16_t test_val16 = 4200;
+    *static_cast<uint16_t*>(ptr16) = test_val16;
+    EXPECT_FALSE(segment.setNamedAddress("test address", ptr16));
+    result = segment.getNamedAddress("test address");
+    EXPECT_TRUE(result.first);
+    EXPECT_EQ(test_val16, *static_cast<const uint16_t*>(result.second));
+
+    // Clear it.  Then we won't be able to find it any more.
+    EXPECT_TRUE(segment.clearNamedAddress("test address"));
+    EXPECT_FALSE(segment.getNamedAddress("test address").first);
+
+    // duplicate attempt of clear will result in false as it doesn't exist.
+    EXPECT_FALSE(segment.clearNamedAddress("test address"));
+
+    // Setting NULL is okay.
+    EXPECT_FALSE(segment.setNamedAddress("null address", NULL));
+    result = segment.getNamedAddress("null address");
+    EXPECT_TRUE(result.first);
+    EXPECT_FALSE(result.second);
+
+    // If the underlying implementation performs explicit check against
+    // out-of-segment address, confirm the behavior.
+    if (!out_of_segment_ok) {
+        uint8_t ch = 'A';
+        EXPECT_THROW(segment.setNamedAddress("local address", &ch),
+                     MemorySegmentError);
+    }
+
+    // clean them up all
+    segment.deallocate(ptr32, sizeof(uint32_t));
+    EXPECT_FALSE(segment.allMemoryDeallocated()); // not fully deallocated
+    segment.deallocate(ptr16, sizeof(uint16_t));  // not yet
+    EXPECT_FALSE(segment.allMemoryDeallocated());
+    EXPECT_TRUE(segment.clearNamedAddress("null address"));
+    // null name isn't allowed:
+    EXPECT_THROW(segment.clearNamedAddress(NULL), InvalidParameter);
+    EXPECT_TRUE(segment.allMemoryDeallocated()); // now everything is gone
+}
+
+}
+}
+}
diff --git a/src/lib/util/tests/memory_segment_common_unittest.h b/src/lib/util/tests/memory_segment_common_unittest.h
new file mode 100644
index 0000000..435ff12
--- /dev/null
+++ b/src/lib/util/tests/memory_segment_common_unittest.h
@@ -0,0 +1,28 @@
+// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <util/memory_segment.h>
+
+namespace isc {
+namespace util {
+namespace test {
+
+/// \brief Implementation dependent checks on memory segment named addresses.
+///
+/// This function contains a set of test cases for given memory segment
+/// regarding "named address" methods.  The test cases basically only depend
+/// on the base class interfaces, but if the underlying implementation does
+/// not check if the given address to setNamedAddress() belongs to the segment,
+/// out_of_segment_ok should be set to true.
+void checkSegmentNamedAddress(MemorySegment& segment, bool out_of_segment_ok);
+
+}
+}
+}
+
+// Local Variables:
+// mode: c++
+// End:
diff --git a/src/lib/util/tests/memory_segment_local_unittest.cc b/src/lib/util/tests/memory_segment_local_unittest.cc
new file mode 100644
index 0000000..d1aa52d
--- /dev/null
+++ b/src/lib/util/tests/memory_segment_local_unittest.cc
@@ -0,0 +1,117 @@
+// Copyright (C) 2012-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/tests/memory_segment_common_unittest.h>
+
+#include <util/memory_segment_local.h>
+#include <exceptions/exceptions.h>
+#include <gtest/gtest.h>
+#include <boost/scoped_ptr.hpp>
+#include <memory>
+#include <limits.h>
+
+using namespace std;
+using namespace isc::util;
+
+namespace {
+
+TEST(MemorySegmentLocal, TestLocal) {
+    boost::scoped_ptr<MemorySegment> segment(new MemorySegmentLocal());
+
+    // By default, nothing is allocated.
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+
+    void* ptr = segment->allocate(1024);
+
+    // Now, we have an allocation:
+    EXPECT_FALSE(segment->allMemoryDeallocated());
+
+    void* ptr2 = segment->allocate(42);
+
+    // Still:
+    EXPECT_FALSE(segment->allMemoryDeallocated());
+
+    // These should not fail, because the buffers have been allocated.
+    EXPECT_NO_FATAL_FAILURE(memset(ptr, 0, 1024));
+    EXPECT_NO_FATAL_FAILURE(memset(ptr, 0, 42));
+
+    segment->deallocate(ptr, 1024);
+
+    // Still:
+    EXPECT_FALSE(segment->allMemoryDeallocated());
+
+    segment->deallocate(ptr2, 42);
+
+    // Now, we have an deallocated everything:
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+}
+
+/// @todo: disabled, see ticket #3510
+TEST(MemorySegmentLocal, DISABLED_TestTooMuchMemory) {
+    boost::scoped_ptr<MemorySegment> segment(new MemorySegmentLocal());
+
+    // Although it should be perfectly fine to use the ULONG_MAX
+    // instead of LONG_MAX as the size_t value should be unsigned,
+    // Valgrind appears to be using the signed value and hence the
+    // maximum positive value is LONG_MAX for Valgrind. But, this
+    // should be sufficient to test the "too much memory" conditions.
+    EXPECT_THROW(segment->allocate(LONG_MAX), bad_alloc);
+}
+
+TEST(MemorySegmentLocal, TestBadDeallocate) {
+    boost::scoped_ptr<MemorySegment> segment(new MemorySegmentLocal());
+
+    // By default, nothing is allocated.
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+
+    void* ptr = segment->allocate(1024);
+
+    // Now, we have an allocation:
+    EXPECT_FALSE(segment->allMemoryDeallocated());
+
+    // This should not throw
+    EXPECT_NO_THROW(segment->deallocate(ptr, 1024));
+
+    // Now, we have an deallocated everything:
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+
+    ptr = segment->allocate(1024);
+
+    // Now, we have another allocation:
+    EXPECT_FALSE(segment->allMemoryDeallocated());
+
+    // This should throw as the size passed to deallocate() is larger
+    // than what was allocated.
+    EXPECT_THROW(segment->deallocate(ptr, 2048), isc::OutOfRange);
+
+    // This should not throw
+    EXPECT_NO_THROW(segment->deallocate(ptr, 1024));
+
+    // Now, we have an deallocated everything:
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+}
+
+TEST(MemorySegmentLocal, TestNullDeallocate) {
+    boost::scoped_ptr<MemorySegment> segment(new MemorySegmentLocal());
+
+    // By default, nothing is allocated.
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+
+    // NULL deallocation is a no-op.
+    EXPECT_NO_THROW(segment->deallocate(NULL, 1024));
+
+    // This should still return true.
+    EXPECT_TRUE(segment->allMemoryDeallocated());
+}
+
+TEST(MemorySegmentLocal, namedAddress) {
+    MemorySegmentLocal segment;
+    isc::util::test::checkSegmentNamedAddress(segment, true);
+}
+
+} // anonymous namespace
diff --git a/src/lib/util/tests/multi_threading_mgr_unittest.cc b/src/lib/util/tests/multi_threading_mgr_unittest.cc
new file mode 100644
index 0000000..400a7e9
--- /dev/null
+++ b/src/lib/util/tests/multi_threading_mgr_unittest.cc
@@ -0,0 +1,517 @@
+// Copyright (C) 2019-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <util/multi_threading_mgr.h>
+#include <testutils/gtest_utils.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc::util;
+using namespace isc;
+
+/// @brief Fixture used to reset multi-threading before and after each test.
+struct MultiThreadingMgrTest : ::testing::Test {
+    /// @brief Constructor.
+    MultiThreadingMgrTest() {
+        MultiThreadingMgr::instance().apply(false, 0, 0);
+    }
+
+    /// @brief Destructor.
+    ~MultiThreadingMgrTest() {
+        MultiThreadingMgr::instance().apply(false, 0, 0);
+    }
+
+    /// @brief Check thread pool state.
+    ///
+    /// @param mode The multi-threading mode.
+    /// @param size The thread pool size.
+    /// @param count The thread queue size.
+    /// @param running The running threads count.
+    /// @param in_cs Flag which indicates if running inside critical section.
+    /// @param enabled Flag which indicates if thread pool is started and running.
+    /// @param paused Flag which indicates if thread pool is started and paused.
+    void checkState(bool mode, size_t size, size_t count, size_t running,
+                    bool in_cs = false, bool enabled = false, bool paused = false) {
+        EXPECT_EQ(MultiThreadingMgr::instance().getMode(), mode);
+        EXPECT_EQ(MultiThreadingMgr::instance().getThreadPoolSize(), size);
+        EXPECT_EQ(MultiThreadingMgr::instance().getPacketQueueSize(), count);
+        EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().size(), running);
+        EXPECT_EQ(MultiThreadingMgr::instance().isInCriticalSection(), in_cs);
+        EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().enabled(), enabled);
+        EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().paused(), paused);
+    }
+};
+
+/// @brief Verifies that the default mode is false (MT disabled).
+TEST_F(MultiThreadingMgrTest, defaultMode) {
+    // MT should be disabled
+    EXPECT_FALSE(MultiThreadingMgr::instance().getMode());
+}
+
+/// @brief Verifies that the mode setter works.
+TEST_F(MultiThreadingMgrTest, setMode) {
+    // enable MT
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setMode(true));
+    // MT should be enabled
+    EXPECT_TRUE(MultiThreadingMgr::instance().getMode());
+    // disable MT
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setMode(false));
+    // MT should be disabled
+    EXPECT_FALSE(MultiThreadingMgr::instance().getMode());
+}
+
+/// @brief Verifies that accessing the thread pool works.
+TEST_F(MultiThreadingMgrTest, threadPool) {
+    // get the thread pool
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().getThreadPool());
+}
+
+/// @brief Verifies that the thread pool size setter works.
+TEST_F(MultiThreadingMgrTest, threadPoolSize) {
+    // default thread count is 0
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPoolSize(), 0);
+    // set thread count to 16
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setThreadPoolSize(16));
+    // thread count should be 16
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPoolSize(), 16);
+    // set thread count to 0
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setThreadPoolSize(0));
+    // thread count should be 0
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPoolSize(), 0);
+}
+
+/// @brief Verifies that the packet queue size setter works.
+TEST_F(MultiThreadingMgrTest, packetQueueSize) {
+    // default queue size is 0
+    EXPECT_EQ(MultiThreadingMgr::instance().getPacketQueueSize(), 0);
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().getMaxQueueSize(), 0);
+    // set queue size to 16
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setPacketQueueSize(16));
+    // queue size should be 16
+    EXPECT_EQ(MultiThreadingMgr::instance().getPacketQueueSize(), 16);
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().getMaxQueueSize(), 16);
+    // set queue size to 0
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setPacketQueueSize(0));
+    // queue size should be 0
+    EXPECT_EQ(MultiThreadingMgr::instance().getPacketQueueSize(), 0);
+    EXPECT_EQ(MultiThreadingMgr::instance().getThreadPool().getMaxQueueSize(), 0);
+}
+
+/// @brief Verifies that detecting thread count works.
+TEST_F(MultiThreadingMgrTest, detectThreadCount) {
+    // detecting thread count should work
+    EXPECT_NE(MultiThreadingMgr::detectThreadCount(), 0);
+}
+
+/// @brief Verifies that apply settings works.
+TEST_F(MultiThreadingMgrTest, applyConfig) {
+    checkState(false, 0, 0, 0);
+    // enable MT with 16 threads and queue size 256
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(true, 16, 256));
+    checkState(true, 16, 256, 16, false, true);
+    // disable MT
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(false, 16, 256));
+    checkState(false, 0, 0, 0);
+    // enable MT with auto scaling
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(true, 0, 0));
+    checkState(true, MultiThreadingMgr::detectThreadCount(), 0, MultiThreadingMgr::detectThreadCount(), false, true);
+    // disable MT
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(false, 0, 0));
+    checkState(false, 0, 0, 0);
+}
+
+/// @brief Verifies that the critical section flag works.
+TEST_F(MultiThreadingMgrTest, criticalSectionFlag) {
+    checkState(false, 0, 0, 0);
+    // exit critical section
+    EXPECT_THROW(MultiThreadingMgr::instance().exitCriticalSection(), InvalidOperation);
+    // critical section should be disabled
+    EXPECT_FALSE(MultiThreadingMgr::instance().isInCriticalSection());
+    // enter critical section
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().enterCriticalSection());
+    // critical section should be enabled
+    EXPECT_TRUE(MultiThreadingMgr::instance().isInCriticalSection());
+    // enable MT with 16 threads and queue size 256
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(true, 16, 256));
+    checkState(true, 16, 256, 0, true);
+    // exit critical section
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().exitCriticalSection());
+    // critical section should be disabled
+    EXPECT_FALSE(MultiThreadingMgr::instance().isInCriticalSection());
+    // exit critical section
+    EXPECT_THROW(MultiThreadingMgr::instance().exitCriticalSection(), InvalidOperation);
+    // critical section should be disabled
+    EXPECT_FALSE(MultiThreadingMgr::instance().isInCriticalSection());
+    // disable MT
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().apply(false, 0, 0));
+    checkState(false, 0, 0, 0);
+}
+
+/// @brief Verifies that the critical section works.
+TEST_F(MultiThreadingMgrTest, criticalSection) {
+    checkState(false, 0, 0, 0);
+    // apply multi-threading configuration with 16 threads and queue size 256
+    MultiThreadingMgr::instance().apply(true, 16, 256);
+    checkState(true, 16, 256, 16, false, true);
+    // use scope to test constructor and destructor
+    {
+        MultiThreadingCriticalSection cs;
+        checkState(true, 16, 256, 16, true, true, true);
+        // use scope to test constructor and destructor
+        {
+            MultiThreadingCriticalSection inner_cs;
+            checkState(true, 16, 256, 16, true, true, true);
+        }
+        checkState(true, 16, 256, 16, true, true, true);
+    }
+    checkState(true, 16, 256, 16, false, true);
+    // use scope to test constructor and destructor
+    {
+        MultiThreadingCriticalSection cs;
+        checkState(true, 16, 256, 16, true, true, true);
+        // apply multi-threading configuration with 64 threads and queue size 4
+        MultiThreadingMgr::instance().apply(true, 64, 4);
+        checkState(true, 64, 4, 0, true);
+    }
+    checkState(true, 64, 4, 64, false, true);
+    // use scope to test constructor and destructor
+    {
+        MultiThreadingCriticalSection cs;
+        checkState(true, 64, 4, 64, true, true, true);
+        // apply multi-threading configuration with 0 threads
+        MultiThreadingMgr::instance().apply(false, 64, 256);
+        checkState(false, 0, 0, 0, true);
+    }
+    checkState(false, 0, 0, 0);
+    // use scope to test constructor and destructor
+    {
+        MultiThreadingCriticalSection cs;
+        checkState(false, 0, 0, 0, true);
+        // use scope to test constructor and destructor
+        {
+            MultiThreadingCriticalSection inner_cs;
+            checkState(false, 0, 0, 0, true);
+        }
+        checkState(false, 0, 0, 0, true);
+    }
+    checkState(false, 0, 0, 0);
+    // use scope to test constructor and destructor
+    {
+        MultiThreadingCriticalSection cs;
+        checkState(false, 0, 0, 0, true);
+        // apply multi-threading configuration with 64 threads
+        MultiThreadingMgr::instance().apply(true, 64, 256);
+        checkState(true, 64, 256, 0, true);
+    }
+    checkState(true, 64, 256, 64, false, true);
+    // apply multi-threading configuration with 0 threads
+    MultiThreadingMgr::instance().apply(false, 0, 0);
+    checkState(false, 0, 0, 0);
+}
+
+/// @brief Checks that the lock works only when multi-threading is enabled and
+/// only during its lifetime.
+TEST(MultiThreadingLockTest, scope) {
+    // Check that the mutex is unlocked by default at first.
+    std::mutex mutex;
+    ASSERT_TRUE(mutex.try_lock());
+    mutex.unlock();
+
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setMode(false));
+
+    // Check that the lock does not locks the mutex if multi-threading is disabled.
+    {
+        MultiThreadingLock lock(mutex);
+        ASSERT_TRUE(mutex.try_lock());
+        mutex.unlock();
+    }
+
+    // Check that the mutex is still unlocked when the lock goes out of scope.
+    ASSERT_TRUE(mutex.try_lock());
+    mutex.unlock();
+
+    EXPECT_NO_THROW(MultiThreadingMgr::instance().setMode(true));
+
+    // Check that the lock actively locks the mutex if multi-threading is enabled.
+    {
+        MultiThreadingLock lock(mutex);
+        ASSERT_FALSE(mutex.try_lock());
+    }
+
+    // Check that the mutex is unlocked when the lock goes out of scope.
+    ASSERT_TRUE(mutex.try_lock());
+    mutex.unlock();
+}
+
+/// @brief Test fixture for exercised CriticalSection callbacks.
+class CriticalSectionCallbackTest : public ::testing::Test {
+public:
+    /// @brief Constructor.
+    CriticalSectionCallbackTest() {
+        MultiThreadingMgr::instance().apply(false, 0, 0);
+    }
+
+    /// @brief Destructor.
+    ~CriticalSectionCallbackTest() {
+        MultiThreadingMgr::instance().apply(false, 0, 0);
+    }
+
+    /// @brief A callback that adds the value 1 to invocations lists.
+    void one() {
+        invocations_.push_back(1);
+    }
+
+    /// @brief A callback that adds the value 2 to invocations lists.
+    void two() {
+        invocations_.push_back(2);
+    }
+
+    /// @brief A callback that adds the value 3 to invocations lists.
+    void three() {
+        invocations_.push_back(3);
+    }
+
+    /// @brief A callback that adds the value 4 to invocations lists.
+    void four() {
+        invocations_.push_back(4);
+    }
+
+    /// @brief A callback that throws @ref isc::Exception which is ignored.
+    void ignoredException() {
+        isc_throw(isc::Exception, "ignored");
+    }
+
+    /// @brief A callback that throws @ref isc::MultiThreadingInvalidOperation
+    /// which is propagated to the scope of the
+    /// @ref MultiThreadingCriticalSection constructor.
+    void observedException() {
+        isc_throw(isc::MultiThreadingInvalidOperation, "observed");
+    }
+
+    /// @brief Indicates whether or not the DHCP thread pool is running.
+    ///
+    /// @return True if the pool is running, false otherwise.
+    bool isThreadPoolRunning() {
+        return (!MultiThreadingMgr::instance().getThreadPool().paused());
+    }
+
+    /// @brief Checks callback invocations over a series of nested
+    /// CriticalSections.
+    ///
+    /// @param entries A vector of the invocation values that should
+    /// be present after entry into the outermost CriticalSection.  The
+    /// expected values should be in the order the callbacks were added
+    /// to the MultiThreadingMgr's list of callbacks.
+    /// @param exits A vector of the invocation values that should
+    /// be present after exiting the outermost CriticalSection.  The
+    /// expected values should be in the order the callbacks were added
+    /// to the MultiThreadingMgr's list of callbacks.
+    /// @param should_throw The flag indicating if the CriticalSection should
+    /// throw, simulating a dead-lock scenario when a processing thread tries
+    /// to stop the thread pool.
+    void runCriticalSections(std::vector<int> entries, std::vector<int>exits,
+                             bool should_throw = false) {
+        // Pool must be running.
+        ASSERT_TRUE(isThreadPoolRunning());
+
+        // Clear the invocations list.
+        invocations_.clear();
+
+        // Use scope to create nested CriticalSections.
+        if (!should_throw) {
+            // Enter a critical section.
+            MultiThreadingCriticalSection cs;
+
+            // Thread pool should be stopped.
+            ASSERT_FALSE(isThreadPoolRunning());
+
+            if (entries.size()) {
+                // We expect entry invocations.
+                ASSERT_EQ(invocations_.size(), entries.size());
+                ASSERT_EQ(invocations_, entries);
+            } else {
+                // We do not expect entry invocations.
+                ASSERT_FALSE(invocations_.size());
+            }
+
+            // Clear the invocations list.
+            invocations_.clear();
+
+            {
+                // Enter another CriticalSection.
+                MultiThreadingCriticalSection inner_cs;
+
+                // Thread pool should still be stopped.
+                ASSERT_FALSE(isThreadPoolRunning());
+
+                // We should not have had any callback invocations.
+                ASSERT_FALSE(invocations_.size());
+            }
+
+            // After exiting inner section, the thread pool should
+            // still be stopped.
+            ASSERT_FALSE(isThreadPoolRunning());
+
+            // We should not have had more callback invocations.
+            ASSERT_FALSE(invocations_.size());
+        } else {
+            ASSERT_THROW(MultiThreadingCriticalSection cs, MultiThreadingInvalidOperation);
+
+            if (entries.size()) {
+                // We expect entry invocations.
+                ASSERT_EQ(invocations_.size(), entries.size());
+                ASSERT_EQ(invocations_, entries);
+            } else {
+                // We do not expect entry invocations.
+                ASSERT_FALSE(invocations_.size());
+            }
+
+            // Clear the invocations list.
+            invocations_.clear();
+        }
+
+        // After exiting the outer section, the thread pool should
+        // match the thread count.
+        ASSERT_TRUE(isThreadPoolRunning());
+
+        if (exits.size()) {
+            // We expect exit invocations.
+            ASSERT_EQ(invocations_, exits);
+        } else {
+            // We do not expect exit invocations.
+            ASSERT_FALSE(invocations_.size());
+        }
+    }
+
+    /// @brief A list of values set by callback invocations.
+    std::vector<int> invocations_;
+};
+
+/// @brief Verifies critical section callback maintenance:
+/// catch invalid pairs, add pairs, remove pairs.
+TEST_F(CriticalSectionCallbackTest, addAndRemove) {
+    auto& mgr = MultiThreadingMgr::instance();
+
+    // Cannot add with a blank name.
+    ASSERT_THROW_MSG(mgr.addCriticalSectionCallbacks("", [](){}, [](){}, [](){}),
+                     BadValue, "CSCallbackSetList - name cannot be empty");
+
+    // Cannot add with an empty check callback.
+    ASSERT_THROW_MSG(mgr.addCriticalSectionCallbacks("bad", nullptr, [](){}, [](){}),
+                     BadValue, "CSCallbackSetList - check callback for bad cannot be empty");
+
+    // Cannot add with an empty exit callback.
+    ASSERT_THROW_MSG(mgr.addCriticalSectionCallbacks("bad", [](){}, nullptr, [](){}),
+                     BadValue, "CSCallbackSetList - entry callback for bad cannot be empty");
+
+    // Cannot add with an empty exit callback.
+    ASSERT_THROW_MSG(mgr.addCriticalSectionCallbacks("bad", [](){}, [](){}, nullptr),
+                     BadValue, "CSCallbackSetList - exit callback for bad cannot be empty");
+
+    // Should be able to add foo.
+    ASSERT_NO_THROW_LOG(mgr.addCriticalSectionCallbacks("foo", [](){}, [](){}, [](){}));
+
+    // Should not be able to add foo twice.
+    ASSERT_THROW_MSG(mgr.addCriticalSectionCallbacks("foo", [](){}, [](){}, [](){}),
+                     BadValue, "CSCallbackSetList - callbacks for foo already exist");
+
+    // Should be able to add bar.
+    ASSERT_NO_THROW_LOG(mgr.addCriticalSectionCallbacks("bar", [](){}, [](){}, [](){}));
+
+    // Should be able to remove foo.
+    ASSERT_NO_THROW_LOG(mgr.removeCriticalSectionCallbacks("foo"));
+
+    // Should be able to remove foo twice without issue.
+    ASSERT_NO_THROW_LOG(mgr.removeCriticalSectionCallbacks("foo"));
+
+    // Should be able to remove all without issue.
+    ASSERT_NO_THROW_LOG(mgr.removeAllCriticalSectionCallbacks());
+}
+
+/// @brief Verifies that the critical section callbacks work.
+TEST_F(CriticalSectionCallbackTest, invocations) {
+    // get the thread pool instance
+    auto& thread_pool = MultiThreadingMgr::instance().getThreadPool();
+    // thread pool should be stopped
+    EXPECT_EQ(thread_pool.size(), 0);
+
+    // Add two sets of CriticalSection call backs.
+    MultiThreadingMgr::instance().addCriticalSectionCallbacks("oneAndTwo",
+         std::bind(&CriticalSectionCallbackTest::ignoredException, this),
+         std::bind(&CriticalSectionCallbackTest::one, this),
+         std::bind(&CriticalSectionCallbackTest::two, this));
+
+    MultiThreadingMgr::instance().addCriticalSectionCallbacks("threeAndFour",
+         std::bind(&CriticalSectionCallbackTest::ignoredException, this),
+         std::bind(&CriticalSectionCallbackTest::three, this),
+         std::bind(&CriticalSectionCallbackTest::four, this));
+
+    // Apply multi-threading configuration with 16 threads and queue size 256.
+    MultiThreadingMgr::instance().apply(true, 16, 256);
+
+    // Make three passes over nested CriticalSections to ensure
+    // callbacks execute at the appropriate times and we can do
+    // so repeatedly.
+    for (int i = 0; i < 3; ++i) {
+        runCriticalSections({1 ,3}, {4, 2});
+    }
+
+    // Now remove the first set of callbacks.
+    MultiThreadingMgr::instance().removeCriticalSectionCallbacks("oneAndTwo");
+
+    // Retest CriticalSections.
+    runCriticalSections({3}, {4});
+
+    // Now remove the remaining callbacks.
+    MultiThreadingMgr::instance().removeAllCriticalSectionCallbacks();
+
+    // Retest CriticalSections.
+    runCriticalSections({}, {});
+}
+
+/// @brief Verifies that the critical section callbacks work.
+TEST_F(CriticalSectionCallbackTest, invocationsWithExceptions) {
+    // get the thread pool instance
+    auto& thread_pool = MultiThreadingMgr::instance().getThreadPool();
+    // thread pool should be stopped
+    EXPECT_EQ(thread_pool.size(), 0);
+
+    // Apply multi-threading configuration with 16 threads and queue size 256.
+    MultiThreadingMgr::instance().apply(true, 16, 256);
+
+    // Add two sets of CriticalSection call backs.
+    MultiThreadingMgr::instance().addCriticalSectionCallbacks("observed",
+         std::bind(&CriticalSectionCallbackTest::observedException, this),
+         std::bind(&CriticalSectionCallbackTest::one, this),
+         std::bind(&CriticalSectionCallbackTest::two, this));
+
+    MultiThreadingMgr::instance().addCriticalSectionCallbacks("ignored",
+         std::bind(&CriticalSectionCallbackTest::ignoredException, this),
+         std::bind(&CriticalSectionCallbackTest::three, this),
+         std::bind(&CriticalSectionCallbackTest::four, this));
+
+    // Make three passes over nested CriticalSections to ensure
+    // callbacks execute at the appropriate times and we can do
+    // so repeatedly.
+    for (int i = 0; i < 3; ++i) {
+        runCriticalSections({}, {}, true);
+    }
+
+    // Now remove the first set of callbacks.
+    MultiThreadingMgr::instance().removeCriticalSectionCallbacks("observed");
+
+    // Retest CriticalSections.
+    runCriticalSections({3}, {4});
+
+    // Now remove the remaining callbacks.
+    MultiThreadingMgr::instance().removeAllCriticalSectionCallbacks();
+
+    // Retest CriticalSections.
+    runCriticalSections({}, {});
+}
diff --git a/src/lib/util/tests/optional_unittest.cc b/src/lib/util/tests/optional_unittest.cc
new file mode 100644
index 0000000..71830ab
--- /dev/null
+++ b/src/lib/util/tests/optional_unittest.cc
@@ -0,0 +1,162 @@
+// Copyright (C) 2015-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <util/optional.h>
+#include <gtest/gtest.h>
+
+namespace {
+
+using namespace isc::util;
+
+// This test checks that the constructors work correctly.
+TEST(OptionalTest, constructor) {
+    // Explicitly set a value via constructor. The value becomes
+    // specified.
+    Optional<int> value1(10);
+    EXPECT_EQ(10, value1.get());
+    EXPECT_FALSE(value1.unspecified());
+
+    // Do not set a value in a constructor. The value should be
+    // unspecified.
+    Optional<int> value2;
+    EXPECT_EQ(0, value2.get());
+    EXPECT_TRUE(value2.unspecified());
+
+    // Use the non-default value for second parameter.
+    Optional<bool> value3(true, true);
+    EXPECT_TRUE(value3.get());
+    EXPECT_TRUE(value3.unspecified());
+}
+
+// This test checks if the constructors for a string value
+// work correctly.
+TEST(OptionalTest, constructorString) {
+    Optional<std::string> value1("foo");
+    EXPECT_EQ("foo", value1.get());
+    EXPECT_FALSE(value1.unspecified());
+
+    Optional<std::string> value2;
+    EXPECT_TRUE(value2.get().empty());
+    EXPECT_TRUE(value2.unspecified());
+}
+
+// This test checks if the assignment operator assigning an actual
+// value to the optional value works as expected.
+TEST(OptionalTest, assignValue) {
+    Optional<int> value(10, true);
+    EXPECT_EQ(10, value.get());
+    EXPECT_TRUE(value.unspecified());
+
+    // Assign a new value.
+    value = 111;
+    EXPECT_EQ(111, value.get());
+    EXPECT_FALSE(value.unspecified());
+
+    // Assign another value.
+    value = 1000;
+    EXPECT_EQ(1000, value.get());
+    EXPECT_FALSE(value.unspecified());
+}
+
+// This test checks if the assignment operator assigning an actual
+// string value to the optional value works as expected.
+TEST(OptionalTest, assignStringValue) {
+    Optional<std::string> value("foo");
+    EXPECT_EQ("foo", value.get());
+    EXPECT_FALSE(value.unspecified());
+
+    value = "bar";
+    EXPECT_EQ("bar", value.get());
+    EXPECT_FALSE(value.unspecified());
+
+    value = "foobar";
+    EXPECT_EQ("foobar", value.get());
+    EXPECT_FALSE(value.unspecified());
+}
+
+// This test checks that it is possible to modify the flag that indicates
+// if the value is specified or unspecified.
+TEST(OptionalTest, modifyUnspecified) {
+    Optional<int> value;
+    EXPECT_TRUE(value.unspecified());
+
+    value.unspecified(false);
+    EXPECT_FALSE(value.unspecified());
+
+    value.unspecified(true);
+    EXPECT_TRUE(value.unspecified());
+}
+
+// This test checks if the type case operator returns correct value.
+TEST(OptionalTest, typeCastOperator) {
+    Optional<int> value(-10);
+    EXPECT_EQ(-10, value.get());
+    EXPECT_FALSE(value.unspecified());
+
+    int actual = value;
+    EXPECT_EQ(-10, actual);
+}
+
+// This test checks if the type case operator returns correct string
+// value.
+TEST(OptionalTest, stringCastOperator) {
+    Optional<std::string> value("xyz");
+    EXPECT_EQ("xyz", value.get());
+    EXPECT_FALSE(value.unspecified());
+
+    std::string actual = value;
+    EXPECT_EQ("xyz", actual);
+}
+
+// This test checks that the equality operators work as expected.
+TEST(OptionalTest, equality) {
+    int exp_value = 1234;
+    Optional<int> value(1234);
+    EXPECT_TRUE(value == exp_value);
+    EXPECT_FALSE(value != exp_value);
+}
+
+// This test checks that the equality operators for strings work as
+// expected.
+TEST(OptionalTest, stringEquality) {
+    const char* exp_value = "foo";
+    Optional<std::string> value("foo");
+    EXPECT_TRUE(value == exp_value);
+    EXPECT_FALSE(value != exp_value);
+}
+
+// This test checks that an exception is thrown when calling an empty()
+// method on non-string optional value.
+TEST(OptionalTest, empty) {
+    Optional<int> value(10);
+    EXPECT_THROW(value.empty(), isc::InvalidOperation);
+}
+
+// This test checks that no exception is thrown when calling an empty()
+// method on string optional value and that it returns an expected
+// boolean value.
+TEST(OptionalTest, stringEmpty) {
+    Optional<std::string> value("foo");
+    bool is_empty = true;
+    ASSERT_NO_THROW(is_empty = value.empty());
+    EXPECT_FALSE(is_empty);
+
+    value = "";
+    ASSERT_NO_THROW(is_empty = value.empty());
+    EXPECT_TRUE(is_empty);
+}
+
+// Checks that the valueOr function works correctly.
+TEST(OptionalTest, valueOr) {
+    Optional<std::string> optional("foo");
+    EXPECT_EQ(optional.valueOr("bar"), "foo");
+
+    Optional<std::string> unspecified_optional;
+    EXPECT_EQ(unspecified_optional.valueOr("bar"), "bar");
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/pid_file_unittest.cc b/src/lib/util/tests/pid_file_unittest.cc
new file mode 100644
index 0000000..5f00d72
--- /dev/null
+++ b/src/lib/util/tests/pid_file_unittest.cc
@@ -0,0 +1,206 @@
+// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/pid_file.h>
+#include <gtest/gtest.h>
+#include <fstream>
+#include <signal.h>
+#include <stdint.h>
+
+namespace {
+using namespace isc::util;
+
+// Filenames used for testing.
+const char* TESTNAME = "pid_file.test";
+
+class PIDFileTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    PIDFileTest() = default;
+
+    /// @brief Destructor
+    virtual ~PIDFileTest() = default;
+
+    /// @brief Prepends the absolute path to the file specified
+    /// as an argument.
+    ///
+    /// @param filename Name of the file.
+    /// @return Absolute path to the test file.
+    static std::string absolutePath(const std::string& filename);
+
+    /// @brief Generate a random number for use as a PID
+    ///
+    /// @param start - the start of the range we want the PID in
+    /// @param range - the size of the range for our PID
+    ///
+    /// @return returns a random value between start and start + range
+    int randomizePID(const uint32_t start, const uint32_t range) {
+        int pid;
+
+        for (pid = (random() % range) + start;
+             kill(pid, 0) == 0;
+             ++pid)
+            ;
+
+        return (pid);
+    }
+
+protected:
+    /// @brief Removes any old test files before the test
+    virtual void SetUp() {
+        removeTestFile();
+    }
+
+    /// @brief Removes any remaining test files after the test
+    virtual void TearDown() {
+        removeTestFile();
+    }
+
+private:
+    /// @brief Removes any remaining test files
+    void removeTestFile() const {
+        static_cast<void>(remove(absolutePath(TESTNAME).c_str()));
+    }
+
+};
+
+std::string
+PIDFileTest::absolutePath(const std::string& filename) {
+    std::ostringstream s;
+    s << TEST_DATA_BUILDDIR << "/" << filename;
+
+    return (s.str());
+}
+
+/// @brief Test file writing and deletion. Start by removing
+/// any leftover file. Then write a known PID to the file and
+/// attempt to read the file and verify the PID. Next write
+/// a second and verify a second PID to verify that an existing
+/// file is properly overwritten.
+
+TEST_F(PIDFileTest, writeAndDelete) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+    std::ifstream fs;
+    int pid(0);
+
+    // Write a known process id
+    pid_file.write(10);
+
+    // Read the file and compare the pid
+    fs.open(absolutePath(TESTNAME).c_str(), std::ifstream::in);
+    fs >> pid;
+    EXPECT_TRUE(fs.good());
+    EXPECT_EQ(pid, 10);
+    fs.close();
+
+    // Write a second known process id
+    pid_file.write(20);
+
+    // And compare the second pid
+    fs.open(absolutePath(TESTNAME).c_str(), std::ifstream::in);
+    fs >> pid;
+    EXPECT_TRUE(fs.good());
+    EXPECT_EQ(pid, 20);
+    fs.close();
+
+    // Delete the file
+    pid_file.deleteFile();
+
+    // And verify that it's gone
+    fs.open(absolutePath(TESTNAME).c_str(), std::ifstream::in);
+    EXPECT_FALSE(fs.good());
+    fs.close();
+}
+
+/// @brief Test checking a PID. Write the PID of the current
+/// process to the PID file then verify that check indicates
+/// the process is running.
+TEST_F(PIDFileTest, pidInUse) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+
+    // Write the current PID
+    pid_file.write();
+
+    // Check if we think the process is running
+    EXPECT_EQ(getpid(), pid_file.check());
+}
+
+/// @brief Test checking a PID. Write a PID that isn't in use
+/// to the PID file and verify that check indicates the process
+/// isn't running. The PID may get used between when we select it
+/// and write the file and when we check it. To minimize false
+/// errors if the first call to check fails we try again with a
+/// different range of values and only if both attempts fail do
+/// we declare the test to have failed.
+TEST_F(PIDFileTest, pidNotInUse) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+    int pid;
+
+    // get a pid between 10000 and 20000
+    pid = randomizePID(10000, 10000);
+
+    // write it
+    pid_file.write(pid);
+
+    // Check to see if we think the process is running
+    if (pid_file.check() == 0) {
+        return;
+    }
+
+    // get a pid between 40000 and 50000
+    pid = randomizePID(10000, 40000);
+
+    // write it
+    pid_file.write(pid);
+
+    // Check to see if we think the process is running
+    EXPECT_EQ(0, pid_file.check());
+}
+
+/// @brief Test checking a PID.  Write garbage to the PID file
+/// and verify that check throws an error. In this situation
+/// the caller should probably log an error and may decide to
+/// continue or not depending on the requirements.
+TEST_F(PIDFileTest, pidGarbage) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+    std::ofstream fs;
+
+    // Open the file and write garbage to it
+    fs.open(absolutePath(TESTNAME).c_str(), std::ofstream::out);
+    fs << "text" << std::endl;
+    fs.close();
+
+    // Run the check, we expect to get an exception
+    EXPECT_THROW(pid_file.check(), PIDCantReadPID);
+}
+
+/// @brief Test failing to write a file.
+TEST_F(PIDFileTest, pidWriteFail) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+
+    // Create the test file and change it's permission bits
+    // so we can't write to it.
+    pid_file.write(10);
+    chmod(absolutePath(TESTNAME).c_str(), S_IRUSR);
+
+    // Now try a write to the file, expecting an exception
+    EXPECT_THROW(pid_file.write(10), PIDFileError);
+
+    // Don't forget to restore the write right for the next test
+    chmod(absolutePath(TESTNAME).c_str(), S_IRUSR | S_IWUSR);
+}
+
+/// @brief Test deleting a file that doesn't exist
+TEST_F(PIDFileTest, noDeleteFile) {
+    PIDFile pid_file(absolutePath(TESTNAME));
+
+    // Delete a file we haven't created
+    pid_file.deleteFile();
+}
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/range_utilities_unittest.cc b/src/lib/util/tests/range_utilities_unittest.cc
new file mode 100644
index 0000000..ce94a38
--- /dev/null
+++ b/src/lib/util/tests/range_utilities_unittest.cc
@@ -0,0 +1,50 @@
+// Copyright (C) 2010-2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <gtest/gtest.h>
+#include <vector>
+
+#include <util/range_utilities.h>
+
+using namespace std;
+using namespace isc::util;
+
+TEST(RangeUtilitiesTest, isZero) {
+
+    vector<uint8_t> vec(32,0);
+
+    EXPECT_TRUE(isRangeZero(vec.begin(), vec.end()));
+
+    EXPECT_TRUE(isRangeZero(vec.begin(), vec.begin()+1));
+
+    vec[5] = 1;
+    EXPECT_TRUE(isRangeZero(vec.begin(), vec.begin()+5));
+    EXPECT_FALSE(isRangeZero(vec.begin(), vec.begin()+6));
+}
+
+TEST(RangeUtilitiesTest, randomFill) {
+
+    srandom(time(NULL));
+
+    vector<uint8_t> vec1(16,0);
+    vector<uint8_t> vec2(16,0);
+
+    // Testing if returned value is actually random is extraordinary difficult.
+    // Let's just generate bunch of vectors and see if we get the same
+    // value. If we manage to do that in 100 tries, pseudo-random generator
+    // really sucks.
+    fillRandom(vec1.begin(), vec1.end());
+    for (int i=0; i<100; i++) {
+        fillRandom(vec2.begin(), vec2.end());
+        if (vec1 == vec2)
+            FAIL();
+    }
+
+}
diff --git a/src/lib/util/tests/readwrite_mutex_unittest.cc b/src/lib/util/tests/readwrite_mutex_unittest.cc
new file mode 100644
index 0000000..f5ba98d
--- /dev/null
+++ b/src/lib/util/tests/readwrite_mutex_unittest.cc
@@ -0,0 +1,470 @@
+// Copyright (C) 2020-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/readwrite_mutex.h>
+
+#include <gtest/gtest.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/make_shared.hpp>
+
+#include <chrono>
+#include <iostream>
+#include <thread>
+#include <unistd.h>
+
+using namespace isc::util;
+using namespace std;
+
+namespace {
+
+/// @brief Test Fixture for testing read-write mutexes.
+///
+/// Each not basic test follows the same schema:
+/// @code
+/// main thread    work thread
+/// <-             started
+/// work           ->
+///                enter guard
+/// <-             done
+/// terminate      ->
+///                return
+/// join
+/// @endcode
+class ReadWriteMutexTest : public ::testing::Test {
+public:
+
+    /// @brief Read-write mutex.
+    ReadWriteMutex rw_mutex_;
+
+    /// @brief Synchronization objects for work threads.
+    struct Sync {
+        bool started = false;
+        mutex started_mtx;
+        condition_variable started_cv;
+        bool work = false;
+        mutex work_mtx;
+        condition_variable work_cv;
+        bool done = false;
+        mutex done_mtx;
+        condition_variable done_cv;
+        bool terminate = false;
+        mutex terminate_mtx;
+        condition_variable terminate_cv;
+    } syncr_, syncw_;
+
+    /// @brief Body of the reader.
+    ///
+    /// @param rw_mutex The read-write mutex.
+    /// @param syncr The reader synchronization object.
+    void reader(ReadWriteMutex& rw_mutex, Sync& syncr) {
+        // Take mutex to wait for main thread signals.
+        unique_lock<mutex> terminate_lock(syncr.terminate_mtx);
+
+        // Signal the thread started.
+        {
+            lock_guard<mutex> lock(syncr.started_mtx);
+            syncr.started = true;
+        }
+
+        // Wait for work.
+        {
+            unique_lock<mutex> work_lock(syncr.work_mtx);
+            // When this thread starts waiting, the main thread is resumed.
+            syncr.started_cv.notify_one();
+            syncr.work_cv.wait(work_lock, [&](){ return syncr.work; });
+        }
+
+        {
+            // Enter a read lock guard.
+            ReadLockGuard rwlock(rw_mutex);
+
+            // Signal the thread holds the guard.
+            {
+                lock_guard<mutex> done_lock(syncr.done_mtx);
+                syncr.done = true;
+            }
+            syncr.done_cv.notify_one();
+        }
+
+        // Wait to terminate.
+        syncr.terminate_cv.wait(terminate_lock, [&](){ return syncr.terminate; });
+    }
+
+    /// @brief Body of the writer.
+    ///
+    /// @param rw_mutex The read-write mutex.
+    /// @param syncw The writer synchronization object.
+    void writer(ReadWriteMutex& rw_mutex, Sync& syncw) {
+        // Take mutex to wait for main thread signals.
+        unique_lock<mutex> terminate_lock(syncw.terminate_mtx);
+
+        // Signal the thread started.
+        {
+            lock_guard<mutex> lock(syncw.started_mtx);
+            syncw.started = true;
+        }
+
+        // Wait for work.
+        {
+            unique_lock<mutex> work_lock(syncw.work_mtx);
+            // When this thread starts waiting, the main thread is resumed.
+            syncw.started_cv.notify_one();
+            syncw.work_cv.wait(work_lock, [&](){ return syncw.work; });
+        }
+
+        {
+            // Enter a write lock guard.
+            WriteLockGuard rwlock(rw_mutex);
+
+            // Signal the thread holds the guard.
+            {
+                lock_guard<mutex> done_lock(syncw.done_mtx);
+                syncw.done = true;
+            }
+            syncw.done_cv.notify_one();
+        }
+
+        // Wait to terminate.
+        syncw.terminate_cv.wait(terminate_lock, [&](){ return syncw.terminate; });
+    }
+};
+
+// Verify basic read lock guard.
+TEST_F(ReadWriteMutexTest, basicRead) {
+    ReadLockGuard lock(rw_mutex_);
+}
+
+// Verify basic write lock guard.
+TEST_F(ReadWriteMutexTest, basicWrite) {
+    WriteLockGuard lock(rw_mutex_);
+}
+
+// Verify read lock guard using a thread.
+TEST_F(ReadWriteMutexTest, read) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> thread;
+    {
+        unique_lock<mutex> started_lock(syncr_.started_mtx);
+
+        // Create a work thread.
+        thread = boost::make_shared<std::thread>([this](){ reader(rw_mutex_, syncr_); });
+
+        // Wait work thread to start.
+        syncr_.started_cv.wait(started_lock, [this](){ return syncr_.started; });
+
+        unique_lock<mutex> done_lock(syncr_.done_mtx);
+
+        // Signal the thread to work.
+        {
+            lock_guard<mutex> work_lock(syncr_.work_mtx);
+            syncr_.work = true;
+        }
+        syncr_.work_cv.notify_one();
+
+        // Wait thread to hold the read lock.
+        syncr_.done_cv.wait(done_lock, [this](){ return syncr_.done; });
+    }
+
+    // Signal the thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncr_.terminate_mtx);
+        syncr_.terminate = true;
+    }
+    syncr_.terminate_cv.notify_one();
+
+    // Join the thread.
+    thread->join();
+}
+
+// Verify write lock guard using a thread.
+TEST_F(ReadWriteMutexTest, write) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> thread;
+    {
+        unique_lock<mutex> started_lock(syncw_.started_mtx);
+
+        // Create a work thread.
+        thread = boost::make_shared<std::thread>([this](){ writer(rw_mutex_, syncw_); });
+
+        // Wait work thread to start.
+        syncw_.started_cv.wait(started_lock, [this](){ return syncw_.started; });
+
+        unique_lock<mutex> done_lock(syncw_.done_mtx);
+
+        // Signal the thread to work.
+        {
+            lock_guard<mutex> work_lock(syncw_.work_mtx);
+            syncw_.work = true;
+        }
+        syncw_.work_cv.notify_one();
+
+        // Wait thread to hold the write lock.
+        syncw_.done_cv.wait(done_lock, [this](){ return syncw_.done; });
+    }
+
+    // Signal the thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncw_.terminate_mtx);
+        syncw_.terminate = true;
+    }
+    syncw_.terminate_cv.notify_one();
+
+    // Join the thread.
+    thread->join();
+}
+
+// Verify read lock guard can be acquired by multiple threads.
+TEST_F(ReadWriteMutexTest, readRead) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> thread;
+    {
+        unique_lock<mutex> started_lock(syncr_.started_mtx);
+
+        // Create a work thread.
+        thread = boost::make_shared<std::thread>([this](){ reader(rw_mutex_, syncr_); });
+
+        // Enter a read lock guard.
+        ReadLockGuard rwlock(rw_mutex_);
+
+        // Wait work thread to start.
+        syncr_.started_cv.wait(started_lock, [this](){ return syncr_.started; });
+
+        unique_lock<mutex> done_lock(syncr_.done_mtx);
+
+        // Signal the thread to work.
+        {
+            lock_guard<mutex> work_lock(syncr_.work_mtx);
+            syncr_.work = true;
+        }
+        syncr_.work_cv.notify_one();
+
+        // Wait thread to hold the read lock.
+        syncr_.done_cv.wait(done_lock, [this](){ return syncr_.done; });
+    }
+
+    // Signal the thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncr_.terminate_mtx);
+        syncr_.terminate = true;
+    }
+    syncr_.terminate_cv.notify_one();
+
+    // Join the thread.
+    thread->join();
+}
+
+// Verify write lock guard is exclusive of a reader.
+TEST_F(ReadWriteMutexTest, readWrite) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> thread;
+    {
+        unique_lock<mutex> started_lock(syncw_.started_mtx);
+
+        // Create a work thread.
+        thread = boost::make_shared<std::thread>([this](){ writer(rw_mutex_, syncw_); });
+
+        // Wait work thread to start.
+        syncw_.started_cv.wait(started_lock, [this](){ return syncw_.started; });
+
+        unique_lock<mutex> done_lock(syncw_.done_mtx);
+
+        {
+            // Enter a read lock guard.
+            ReadLockGuard rwlock(rw_mutex_);
+
+            // Signal the thread to work.
+            {
+                lock_guard<mutex> work_lock(syncw_.work_mtx);
+                syncw_.work = true;
+            }
+            syncw_.work_cv.notify_one();
+
+            // Verify the work thread is waiting for the write lock.
+            cout << "pausing for one second" << std::endl;
+            bool ret = syncw_.done_cv.wait_for(done_lock, chrono::seconds(1), [this](){ return syncw_.done; });
+
+            EXPECT_FALSE(syncw_.done);
+            EXPECT_FALSE(ret);
+
+            // Exiting the read lock guard.
+        }
+
+        // Wait thread to hold the write lock.
+        syncw_.done_cv.wait(done_lock, [this](){ return syncw_.done; });
+    }
+
+    // Signal the thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncw_.terminate_mtx);
+        syncw_.terminate = true;
+    }
+    syncw_.terminate_cv.notify_one();
+
+    // Join the thread.
+    thread->join();
+}
+
+// Verify write lock guard is exclusive of a writer.
+TEST_F(ReadWriteMutexTest, writeWrite) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> thread;
+    {
+        unique_lock<mutex> started_lock(syncw_.started_mtx);
+
+        // Create a work thread.
+        thread = boost::make_shared<std::thread>([this](){ writer(rw_mutex_, syncw_); });
+
+        // Wait work thread to start.
+        syncw_.started_cv.wait(started_lock, [this](){ return syncw_.started; });
+
+        unique_lock<mutex> done_lock(syncw_.done_mtx);
+
+        {
+            // Enter a write lock guard.
+            WriteLockGuard rwlock(rw_mutex_);
+
+            // Signal the thread to work.
+            {
+                lock_guard<mutex> work_lock(syncw_.work_mtx);
+                syncw_.work = true;
+            }
+            syncw_.work_cv.notify_one();
+
+            // Verify the work thread is waiting for the write lock.
+            cout << "pausing for one second" << std::endl;
+            bool ret = syncw_.done_cv.wait_for(done_lock, chrono::seconds(1), [this](){ return syncw_.done; });
+
+            EXPECT_FALSE(syncw_.done);
+            EXPECT_FALSE(ret);
+
+            // Exiting the write lock guard.
+        }
+
+        // Wait thread to hold the write lock.
+        syncw_.done_cv.wait(done_lock, [this](){ return syncw_.done; });
+    }
+
+    // Signal the thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncw_.terminate_mtx);
+        syncw_.terminate = true;
+    }
+    syncw_.terminate_cv.notify_one();
+
+    // Join the thread.
+    thread->join();
+}
+
+// Verify that a writer has the preference.
+TEST_F(ReadWriteMutexTest, readWriteRead) {
+    // Take mutex to wait for work thread signals.
+    boost::shared_ptr<std::thread> threadw;
+    {
+        unique_lock<mutex> startedw_lock(syncw_.started_mtx);
+
+        // First thread is a writer.
+        threadw = boost::make_shared<std::thread>([this](){ writer(rw_mutex_, syncw_); });
+
+        // Wait work thread to start.
+        syncw_.started_cv.wait(startedw_lock, [this](){ return syncw_.started; });
+    }
+
+    boost::shared_ptr<std::thread> threadr;
+    {
+        unique_lock<mutex> startedr_lock(syncr_.started_mtx);
+
+        // Second thread is a reader.
+        threadr = boost::make_shared<std::thread>([this](){ reader(rw_mutex_, syncr_); });
+
+        // Wait work thread to start.
+        syncr_.started_cv.wait(startedr_lock, [this](){ return syncr_.started; });
+    }
+
+    {
+        unique_lock<mutex> donew_lock(syncw_.done_mtx);
+        {
+            // Enter a read lock guard.
+            ReadLockGuard rwlock(rw_mutex_);
+
+            // Signal the writer thread to work.
+            {
+                lock_guard<mutex> work_lock(syncw_.work_mtx);
+                syncw_.work = true;
+            }
+            syncw_.work_cv.notify_one();
+
+            // Verify the writer thread is waiting for the write lock.
+            cout << "pausing for one second" << std::endl;
+            bool ret = syncw_.done_cv.wait_for(donew_lock, chrono::seconds(1), [this](){ return syncw_.done; });
+
+            EXPECT_FALSE(syncw_.done);
+            EXPECT_FALSE(ret);
+
+            {
+                unique_lock<mutex> doner_lock(syncr_.done_mtx);
+
+                // Signal the reader thread to work.
+                {
+                    lock_guard<mutex> work_lock(syncr_.work_mtx);
+                    syncr_.work = true;
+                }
+                syncr_.work_cv.notify_one();
+
+                // Verify the reader thread is waiting for the read lock.
+                cout << "pausing for one second" << std::endl;
+                ret = syncr_.done_cv.wait_for(doner_lock, chrono::seconds(1), [this](){ return syncr_.done; });
+
+                EXPECT_FALSE(syncr_.done);
+                EXPECT_FALSE(ret);
+            }
+            // Exiting the read lock guard.
+        }
+
+        {
+            unique_lock<mutex> doner_lock(syncr_.done_mtx);
+            // Verify the reader thread is still waiting for the read lock.
+            cout << "pausing for one second" << std::endl;
+            bool ret = syncr_.done_cv.wait_for(doner_lock, chrono::seconds(1), [this](){ return syncr_.done; });
+
+            EXPECT_FALSE(syncr_.done);
+            EXPECT_FALSE(ret);
+        }
+
+        // Wait writer thread to hold the write lock.
+        syncw_.done_cv.wait(donew_lock, [this](){ return syncw_.done; });
+    }
+
+    {
+        unique_lock<mutex> doner_lock(syncr_.done_mtx);
+        // Wait reader thread to hold the read lock.
+        syncr_.done_cv.wait(doner_lock, [this](){ return syncr_.done; });
+    }
+
+    // Signal the writer thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncw_.terminate_mtx);
+        syncw_.terminate = true;
+    }
+    syncw_.terminate_cv.notify_one();
+
+    // Join the writer thread.
+    threadw->join();
+
+    // Signal the reader thread to terminate.
+    {
+        lock_guard<mutex> terminate_lock(syncr_.terminate_mtx);
+        syncr_.terminate = true;
+    }
+    syncr_.terminate_cv.notify_one();
+
+    // Join the reader thread.
+    threadr->join();
+}
+
+}
diff --git a/src/lib/util/tests/run_unittests.cc b/src/lib/util/tests/run_unittests.cc
new file mode 100644
index 0000000..1e13878
--- /dev/null
+++ b/src/lib/util/tests/run_unittests.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 2011-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/unittests/run_all.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/lib/util/tests/staged_value_unittest.cc b/src/lib/util/tests/staged_value_unittest.cc
new file mode 100644
index 0000000..bcfc677
--- /dev/null
+++ b/src/lib/util/tests/staged_value_unittest.cc
@@ -0,0 +1,106 @@
+// Copyright (C) 2015-2017 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <util/staged_value.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+namespace {
+
+using namespace isc::util;
+
+// This test verifies that the value can be assigned and committed.
+TEST(StagedValueTest, assignAndCommit) {
+    // Initially the value should be set to a default
+    StagedValue<int> value;
+    ASSERT_EQ(0, value.getValue());
+
+    // Set the new value without committing it and make sure it
+    // can be retrieved.
+    value.setValue(4);
+    ASSERT_EQ(4, value.getValue());
+
+    // Commit the value and make sure it still can be retrieved.
+    value.commit();
+    ASSERT_EQ(4, value.getValue());
+
+    // Set new value and retrieve it.
+    value.setValue(10);
+    ASSERT_EQ(10, value.getValue());
+
+    // Do it again and commit it.
+    value.setValue(20);
+    ASSERT_EQ(20, value.getValue());
+    value.commit();
+    EXPECT_EQ(20, value.getValue());
+}
+
+// This test verifies that the value can be reverted if it hasn't been
+// committed.
+TEST(StagedValueTest, revert) {
+    // Set the value and commit.
+    StagedValue<int> value;
+    value.setValue(123);
+    value.commit();
+
+    // Set new value and do not commit.
+    value.setValue(500);
+    // The new value should be the one returned.
+    ASSERT_EQ(500, value.getValue());
+    // But, reverting gets us back to original value.
+    value.revert();
+    EXPECT_EQ(123, value.getValue());
+    // Reverting again doesn't have any effect.
+    value.revert();
+    EXPECT_EQ(123, value.getValue());
+}
+
+// This test verifies that the value can be restored to an original one.
+TEST(StagedValueTest, reset) {
+    // Set the new value and commit.
+    StagedValue<int> value;
+    value.setValue(123);
+    value.commit();
+
+    // Override the value but do not commit.
+    value.setValue(500);
+
+    // Resetting should take us back to default value.
+    value.reset();
+    EXPECT_EQ(0, value.getValue());
+    value.revert();
+    EXPECT_EQ(0, value.getValue());
+}
+
+// This test verifies that second commit doesn't modify a value.
+TEST(StagedValueTest, commit) {
+    // Set the value and commit.
+    StagedValue<int> value;
+    value.setValue(123);
+    value.commit();
+
+    // Second commit should have no effect.
+    value.commit();
+    EXPECT_EQ(123, value.getValue());
+}
+
+// This test checks that type conversion operator works correctly.
+TEST(StagedValueTest, conversionOperator) {
+    StagedValue<int> value;
+    value.setValue(244);
+    EXPECT_EQ(244, value);
+}
+
+// This test checks that the assignment operator works correctly.
+TEST(StagedValueTest, assignmentOperator) {
+    StagedValue<int> value;
+    value = 111;
+    EXPECT_EQ(111, value);
+}
+
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/state_model_unittest.cc b/src/lib/util/tests/state_model_unittest.cc
new file mode 100644
index 0000000..eaaba73
--- /dev/null
+++ b/src/lib/util/tests/state_model_unittest.cc
@@ -0,0 +1,916 @@
+// Copyright (C) 2013-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/state_model.h>
+
+#include <gtest/gtest.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Test derivation of StateModel for exercising state model mechanics.
+///
+/// This class facilitates testing by making non-public methods accessible so
+/// they can be invoked directly in test routines.  It implements a very
+/// rudimentary state model, sufficient to test the state model mechanics
+/// supplied by the base class.
+class StateModelTest : public StateModel, public testing::Test {
+public:
+
+    ///@brief StateModelTest states
+    ///@brief Fake state used for handler mapping tests.
+    static const int DUMMY_ST = SM_DERIVED_STATE_MIN + 1;
+
+    ///@brief Starting state for the test state model.
+    static const int READY_ST = SM_DERIVED_STATE_MIN + 2;
+
+    ///@brief State which simulates doing asynchronous work.
+    static const int DO_WORK_ST = SM_DERIVED_STATE_MIN + 3;
+
+    ///@brief State which finishes off processing.
+    static const int DONE_ST = SM_DERIVED_STATE_MIN + 4;
+
+    ///@brief State in which model is always paused.
+    static const int PAUSE_ALWAYS_ST = SM_DERIVED_STATE_MIN + 5;
+
+    ///@brief State in which model is paused at most once.
+    static const int PAUSE_ONCE_ST = SM_DERIVED_STATE_MIN + 6;
+
+    // StateModelTest events
+    ///@brief Event used to trigger initiation of asynchronous work.
+    static const int WORK_START_EVT = SM_DERIVED_EVENT_MIN + 1;
+
+    ///@brief Event issued when the asynchronous work "completes".
+    static const int WORK_DONE_EVT = SM_DERIVED_EVENT_MIN + 2;
+
+    ///@brief Event issued when all the work is done.
+    static const int ALL_DONE_EVT = SM_DERIVED_EVENT_MIN + 3;
+
+    ///@brief Event used to trigger an attempt to transition to bad state
+    static const int FORCE_UNDEFINED_ST_EVT = SM_DERIVED_EVENT_MIN + 4;
+
+    ///@brief Event used to trigger an attempt to transition to bad state
+    static const int SIMULATE_ERROR_EVT = SM_DERIVED_EVENT_MIN + 5;
+
+    ///@brief Event used to indicate that state machine is unpaused.
+    static const int UNPAUSED_EVT = SM_DERIVED_EVENT_MIN + 6;
+
+    /// @brief Constructor
+    ///
+    /// Parameters match those needed by StateModel.
+    StateModelTest() : dummy_called_(false), work_completed_(false),
+                       failure_explanation_("") {
+    }
+    /// @brief Destructor
+    virtual ~StateModelTest() {
+    }
+
+    /// @brief Fetches the value of the dummy called flag.
+    bool getDummyCalled() {
+        return (dummy_called_);
+    }
+
+    /// @brief StateHandler for fake state, DummyState.
+    ///
+    /// It simply sets the dummy called flag to indicate that this method
+    /// was invoked.
+    void dummyHandler() {
+        dummy_called_ = true;
+    }
+
+    /// @brief Returns the failure explanation string.
+    ///
+    /// This value is set only via onModelFailure and it stores whatever
+    /// explanation that method was passed.
+    const std::string& getFailureExplanation() {
+        return (failure_explanation_);
+    }
+
+    /// @brief Returns indication of whether or not the model succeeded.
+    ///
+    /// If true, this indicates that the test model executed correctly through
+    /// to completion.  The flag is only by the DONE_ST handler.
+    bool getWorkCompleted() {
+        return (work_completed_);
+    }
+
+    /// @brief State handler for the READY_ST.
+    ///
+    /// Serves as the starting state handler, it consumes the
+    /// START_EVT "transitioning" to the state, DO_WORK_ST and
+    /// sets the next event to WORK_START_EVT.
+    void readyHandler() {
+        switch(getNextEvent()) {
+        case START_EVT:
+            transition(DO_WORK_ST, WORK_START_EVT);
+            break;
+        default:
+            // its bogus
+            isc_throw(StateModelError, "readyHandler:invalid event: "
+                      << getContextStr());
+        }
+    }
+
+    /// @brief State handler for the DO_WORK_ST.
+    ///
+    /// Simulates a state that starts some form of asynchronous work.
+    /// When next event is WORK_START_EVT it sets the status to pending
+    /// and signals the state model must "wait" for an event by setting
+    /// next event to NOP_EVT.
+    ///
+    /// When next event is IO_COMPLETED_EVT, it transitions to the state,
+    /// DONE_ST, and sets the next event to WORK_DONE_EVT.
+    void doWorkHandler() {
+        switch(getNextEvent()) {
+        case WORK_START_EVT:
+            postNextEvent(NOP_EVT);
+            break;
+        case WORK_DONE_EVT:
+            work_completed_ = true;
+            transition(DONE_ST, ALL_DONE_EVT);
+            break;
+        case FORCE_UNDEFINED_ST_EVT:
+            transition(9999, ALL_DONE_EVT);
+            break;
+        case SIMULATE_ERROR_EVT:
+            throw std::logic_error("Simulated Unexpected Error");
+            break;
+        default:
+            // its bogus
+            isc_throw(StateModelError, "doWorkHandler:invalid event: "
+                      <<  getContextStr());
+        }
+    }
+
+    /// @brief State handler for the DONE_ST.
+    ///
+    /// This is the last state in the model.  Note that it sets the
+    /// status to completed and next event to NOP_EVT.
+    void doneWorkHandler() {
+        switch(getNextEvent()) {
+        case ALL_DONE_EVT:
+            endModel();
+            break;
+        default:
+            // its bogus
+            isc_throw(StateModelError, "doneWorkHandler:invalid event: "
+                      << getContextStr());
+        }
+    }
+
+    /// @brief State handler for PAUSE_ALWAYS_ST and PAUSE_ONCE_ST.
+    void pauseHandler() {
+        postNextEvent(NOP_EVT);
+    }
+
+    /// @brief Construct the event dictionary.
+    virtual void defineEvents() {
+        // Invoke the base call implementation first.
+        StateModel::defineEvents();
+
+        // Define our events.
+        defineEvent(WORK_START_EVT, "WORK_START_EVT");
+        defineEvent(WORK_DONE_EVT , "WORK_DONE_EVT");
+        defineEvent(ALL_DONE_EVT, "ALL_DONE_EVT");
+        defineEvent(FORCE_UNDEFINED_ST_EVT, "FORCE_UNDEFINED_ST_EVT");
+        defineEvent(SIMULATE_ERROR_EVT, "SIMULATE_ERROR_EVT");
+        defineEvent(UNPAUSED_EVT, "UNPAUSED_EVT");
+    }
+
+    /// @brief Verify the event dictionary.
+    virtual void verifyEvents() {
+        // Invoke the base call implementation first.
+        StateModel::verifyEvents();
+
+        // Verify our events.
+        getEvent(WORK_START_EVT);
+        getEvent(WORK_DONE_EVT);
+        getEvent(ALL_DONE_EVT);
+        getEvent(FORCE_UNDEFINED_ST_EVT);
+        getEvent(SIMULATE_ERROR_EVT);
+        getEvent(UNPAUSED_EVT);
+    }
+
+    /// @brief Construct the state dictionary.
+    virtual void defineStates() {
+        // Invoke the base call implementation first.
+        StateModel::defineStates();
+
+        // Define our states.
+        defineState(DUMMY_ST, "DUMMY_ST",
+                    std::bind(&StateModelTest::dummyHandler, this));
+
+        defineState(READY_ST, "READY_ST",
+                    std::bind(&StateModelTest::readyHandler, this));
+
+        defineState(DO_WORK_ST, "DO_WORK_ST",
+                    std::bind(&StateModelTest::doWorkHandler, this));
+
+        defineState(DONE_ST, "DONE_ST",
+                    std::bind(&StateModelTest::doneWorkHandler, this));
+
+        defineState(PAUSE_ALWAYS_ST, "PAUSE_ALWAYS_ST",
+                    std::bind(&StateModelTest::pauseHandler, this),
+                    STATE_PAUSE_ALWAYS);
+
+        defineState(PAUSE_ONCE_ST, "PAUSE_ONCE_ST",
+                    std::bind(&StateModelTest::pauseHandler, this),
+                    STATE_PAUSE_ONCE);
+    }
+
+    /// @brief Verify the state dictionary.
+    virtual void verifyStates() {
+        // Invoke the base call implementation first.
+        StateModel::verifyStates();
+
+        // Verify our states.
+        getStateInternal(DUMMY_ST);
+        getStateInternal(READY_ST);
+        getStateInternal(DO_WORK_ST);
+        getStateInternal(DONE_ST);
+        getStateInternal(PAUSE_ALWAYS_ST);
+        getStateInternal(PAUSE_ONCE_ST);
+    }
+
+    /// @brief  Manually construct the event and state dictionaries.
+    /// This allows testing without running startModel.
+    void initDictionaries() {
+        ASSERT_NO_THROW(defineEvents());
+        ASSERT_NO_THROW(verifyEvents());
+        ASSERT_NO_THROW(defineStates());
+        ASSERT_NO_THROW(verifyStates());
+    }
+
+    /// @brief Tests the event dictionary entry for the given event value.
+    bool checkEvent(const int value, const std::string& label) {
+        EventPtr event;
+        try  {
+            event = getEvent(value);
+            EXPECT_TRUE(event);
+            EXPECT_EQ(value, event->getValue());
+            EXPECT_EQ(label, event->getLabel());
+        } catch (const std::exception& ex) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /// @brief Tests the state dictionary entry for the given state value.
+    bool checkState(const int value, const std::string& label) {
+        EventPtr state;
+        try  {
+            state = getState(value);
+            EXPECT_TRUE(state);
+            EXPECT_EQ(value, state->getValue());
+            EXPECT_EQ(label, state->getLabel());
+        } catch (const std::exception& ex) {
+            return false;
+        }
+
+        return true;
+    }
+
+
+    /// @brief  Handler called when the model suffers an execution error.
+    virtual void onModelFailure(const std::string& explanation) {
+        failure_explanation_ = explanation;
+    }
+
+    /// @brief Indicator of whether or not the DUMMY_ST handler has been called.
+    bool dummy_called_;
+
+    /// @brief Indicator of whether or not DONE_ST handler has been called.
+    bool work_completed_;
+
+    /// @brief Stores the failure explanation
+    std::string failure_explanation_;
+};
+
+// Declare them so gtest can see them.
+const int StateModelTest::DUMMY_ST;
+const int StateModelTest::READY_ST;
+const int StateModelTest::DO_WORK_ST;
+const int StateModelTest::DONE_ST;
+const int StateModelTest::WORK_START_EVT;
+const int StateModelTest::WORK_DONE_EVT;
+const int StateModelTest::ALL_DONE_EVT;
+const int StateModelTest::PAUSE_ALWAYS_ST;
+const int StateModelTest::PAUSE_ONCE_ST;
+
+/// @brief Checks the fundamentals of defining and retrieving events.
+TEST_F(StateModelTest, eventDefinition) {
+    // After construction, the event dictionary should be empty. Verify that
+    // getEvent will throw when event is not defined.
+    EXPECT_THROW(getEvent(NOP_EVT), StateModelError);
+
+    // Verify that we can add a handler to the map.
+    ASSERT_NO_THROW(defineEvent(NOP_EVT, "NOP_EVT"));
+
+    // Verify that we can find the event by value and its content is correct.
+    EXPECT_TRUE(checkEvent(NOP_EVT, "NOP_EVT"));
+
+    // Verify that we cannot add a duplicate.
+    ASSERT_THROW(defineEvent(NOP_EVT, "NOP_EVT"), StateModelError);
+
+    // Verify that we can still find the event.
+    EXPECT_TRUE(checkEvent(NOP_EVT, "NOP_EVT"));
+}
+
+/// @brief Tests event dictionary construction and verification.
+TEST_F(StateModelTest, eventDictionary) {
+    // After construction, the event dictionary should be empty.
+    // Make sure that verifyEvents() throws.
+    EXPECT_THROW(verifyEvents(), StateModelError);
+
+    // Construct the dictionary and verify it.
+    EXPECT_NO_THROW(defineEvents());
+    EXPECT_NO_THROW(verifyEvents());
+
+    // Verify base class events are defined.
+    EXPECT_TRUE(checkEvent(NOP_EVT, "NOP_EVT"));
+    EXPECT_TRUE(checkEvent(START_EVT, "START_EVT"));
+    EXPECT_TRUE(checkEvent(END_EVT, "END_EVT"));
+    EXPECT_TRUE(checkEvent(FAIL_EVT, "FAIL_EVT"));
+
+    // Verify stub class events are defined.
+    EXPECT_TRUE(checkEvent(WORK_START_EVT, "WORK_START_EVT"));
+    EXPECT_TRUE(checkEvent(WORK_DONE_EVT, "WORK_DONE_EVT"));
+    EXPECT_TRUE(checkEvent(ALL_DONE_EVT, "ALL_DONE_EVT"));
+    EXPECT_TRUE(checkEvent(FORCE_UNDEFINED_ST_EVT, "FORCE_UNDEFINED_ST_EVT"));
+    EXPECT_TRUE(checkEvent(SIMULATE_ERROR_EVT, "SIMULATE_ERROR_EVT"));
+
+    // Verify that undefined events are handled correctly.
+    EXPECT_THROW(getEvent(9999), StateModelError);
+    EXPECT_EQ(LabeledValueSet::UNDEFINED_LABEL, getEventLabel(9999));
+}
+
+/// @brief General testing of event context accessors.
+/// Most if not all of these are also tested as a byproduct off larger tests.
+TEST_F(StateModelTest, eventContextAccessors) {
+    // Construct the event definitions, normally done by startModel.
+    ASSERT_NO_THROW(defineEvents());
+    ASSERT_NO_THROW(verifyEvents());
+
+    // Verify the post-construction values.
+    EXPECT_EQ(NOP_EVT, getNextEvent());
+    EXPECT_EQ(NOP_EVT, getLastEvent());
+
+    // Call setEvent which will update both next event and last event.
+    EXPECT_NO_THROW(postNextEvent(START_EVT));
+
+    // Verify the values are what we expect.
+    EXPECT_EQ(START_EVT, getNextEvent());
+    EXPECT_EQ(NOP_EVT, getLastEvent());
+
+    // Call setEvent again.
+    EXPECT_NO_THROW(postNextEvent(WORK_START_EVT));
+
+    // Verify the values are what we expect.
+    EXPECT_EQ(WORK_START_EVT, getNextEvent());
+    EXPECT_EQ(START_EVT, getLastEvent());
+
+    // Verify that posting an undefined event throws.
+    EXPECT_THROW(postNextEvent(9999), StateModelError);
+}
+
+/// @brief Tests the fundamental methods used for state handler mapping.
+/// Verifies the ability to search for and add entries in the state handler map.
+TEST_F(StateModelTest, stateDefinition) {
+    // After construction, the state dictionary should be empty. Verify that
+    // getState will throw when, state is not defined.
+    EXPECT_THROW(getState(READY_ST), StateModelError);
+
+    // Verify that we can add a state to the dictionary.
+    ASSERT_NO_THROW(defineState(READY_ST, "READY_ST",
+                                std::bind(&StateModelTest::dummyHandler,
+                                          this)));
+
+    // Verify that we can find the state by its value.
+    StatePtr state;
+    EXPECT_NO_THROW(state = getState(READY_ST));
+    EXPECT_TRUE(state);
+
+    // Verify the state's value and label.
+    EXPECT_EQ(READY_ST, state->getValue());
+    EXPECT_EQ("READY_ST", state->getLabel());
+
+    // Now verify that retrieved state's handler executes the correct method.
+    // Make sure the dummy called flag is false prior to invocation.
+    EXPECT_FALSE(getDummyCalled());
+
+    // Invoke the state's handler.
+    EXPECT_NO_THROW(state->run());
+
+    // Verify the dummy called flag is now true.
+    EXPECT_TRUE(getDummyCalled());
+
+    // Verify that we cannot add a duplicate.
+    EXPECT_THROW(defineState(READY_ST, "READY_ST",
+                             std::bind(&StateModelTest::readyHandler, this)),
+                 StateModelError);
+
+    // Verify that we can still find the state.
+    EXPECT_NO_THROW(getState(READY_ST));
+}
+
+/// @brief Tests state dictionary initialization and validation.
+/// This tests the basic concept of state dictionary initialization and
+/// verification by manually invoking the methods normally called by startModel.
+TEST_F(StateModelTest, stateDictionary) {
+    // Verify that the map validation throws prior to the dictionary being
+    // initialized.
+    EXPECT_THROW(verifyStates(), StateModelError);
+
+    // Construct the dictionary and verify it.
+    ASSERT_NO_THROW(defineStates());
+    EXPECT_NO_THROW(verifyStates());
+
+    // Verify the base class states.
+    EXPECT_TRUE(checkState(NEW_ST, "NEW_ST"));
+    EXPECT_TRUE(checkState(END_ST, "END_ST"));
+
+    // Verify stub class states.
+    EXPECT_TRUE(checkState(DUMMY_ST, "DUMMY_ST"));
+    EXPECT_TRUE(checkState(READY_ST, "READY_ST"));
+    EXPECT_TRUE(checkState(DO_WORK_ST, "DO_WORK_ST"));
+    EXPECT_TRUE(checkState(DONE_ST, "DONE_ST"));
+
+    // Verify that undefined states are handled correctly.
+    EXPECT_THROW(getState(9999), StateModelError);
+    EXPECT_EQ(LabeledValueSet::UNDEFINED_LABEL, getStateLabel(9999));
+}
+
+/// @brief General testing of state context accessors.
+/// Most if not all of these are also tested as a byproduct off larger tests.
+TEST_F(StateModelTest, stateContextAccessors) {
+    // setState will throw unless we initialize the handler map.
+    ASSERT_NO_THROW(defineStates());
+    ASSERT_NO_THROW(verifyStates());
+
+    // Verify post-construction state values.
+    EXPECT_EQ(NEW_ST, getCurrState());
+    EXPECT_EQ(NEW_ST, getPrevState());
+
+    // Call setState which will update both state and previous state.
+    EXPECT_NO_THROW(setState(READY_ST));
+
+    // Verify the values are what we expect.
+    EXPECT_EQ(READY_ST, getCurrState());
+    EXPECT_EQ(NEW_ST, getPrevState());
+
+    // Call setState again.
+    EXPECT_NO_THROW(setState(DO_WORK_ST));
+
+    // Verify the values are what we expect.
+    EXPECT_EQ(DO_WORK_ST, getCurrState());
+    EXPECT_EQ(READY_ST, getPrevState());
+
+    // Verify that calling setState with an state that has no handler
+    // will throw.
+    EXPECT_THROW(setState(-1), StateModelError);
+
+    // Verify that calling setState with NEW_ST is ok.
+    EXPECT_NO_THROW(setState(NEW_ST));
+
+    // Verify that calling setState with END_ST is ok.
+    EXPECT_NO_THROW(setState(END_ST));
+
+    // Verify that calling setState with an undefined state throws.
+    EXPECT_THROW(setState(9999), StateModelError);
+}
+
+/// @brief Checks that invoking runModel prior to startModel is not allowed.
+TEST_F(StateModelTest, runBeforeStart) {
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+
+    // Attempt to call runModel before startModel.  This should result in an
+    // orderly model failure.
+    ASSERT_NO_THROW(runModel(START_EVT));
+
+    // Check that state and event are correct.
+    EXPECT_EQ(END_ST, getCurrState());
+    EXPECT_EQ(FAIL_EVT, getNextEvent());
+
+    // Verify that failure explanation is not empty.
+    EXPECT_FALSE(getFailureExplanation().empty());
+}
+
+/// @brief Tests that the endModel may be used to transition the model to
+/// a normal conclusion.
+TEST_F(StateModelTest, transitionWithEnd) {
+    // Init dictionaries manually, normally done by startModel.
+    initDictionaries();
+
+    // call transition to move from NEW_ST to DUMMY_ST with START_EVT
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+    //  Verify that state and event members are as expected.
+    EXPECT_EQ(DUMMY_ST, getCurrState());
+    EXPECT_EQ(NEW_ST, getPrevState());
+    EXPECT_EQ(START_EVT, getNextEvent());
+    EXPECT_EQ(NOP_EVT, getLastEvent());
+
+    // Call endModel to transition us to the end of the model.
+    EXPECT_NO_THROW(endModel());
+
+    // Verify state and event members are correctly set.
+    EXPECT_EQ(END_ST, getCurrState());
+    EXPECT_EQ(DUMMY_ST, getPrevState());
+    EXPECT_EQ(END_EVT, getNextEvent());
+    EXPECT_EQ(START_EVT, getLastEvent());
+}
+
+/// @brief Tests that the abortModel may be used to transition the model to
+/// failed conclusion.
+TEST_F(StateModelTest, transitionWithAbort) {
+    // Init dictionaries manually, normally done by startModel.
+    initDictionaries();
+
+    // call transition to move from NEW_ST to DUMMY_ST with START_EVT
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+    //  Verify that state and event members are as expected.
+    EXPECT_EQ(DUMMY_ST, getCurrState());
+    EXPECT_EQ(NEW_ST, getPrevState());
+    EXPECT_EQ(START_EVT, getNextEvent());
+    EXPECT_EQ(NOP_EVT, getLastEvent());
+
+    // Call endModel to transition us to the end of the model.
+    EXPECT_NO_THROW(abortModel("test invocation"));
+
+    // Verify state and event members are correctly set.
+    EXPECT_EQ(END_ST, getCurrState());
+    EXPECT_EQ(DUMMY_ST, getPrevState());
+    EXPECT_EQ(FAIL_EVT, getNextEvent());
+    EXPECT_EQ(START_EVT, getLastEvent());
+}
+
+/// @brief Tests that the boolean indicators for on state entry and exit
+/// work properly.
+TEST_F(StateModelTest, doFlags) {
+    // Init dictionaries manually, normally done by startModel.
+    initDictionaries();
+
+    // Verify that "do" flags are false.
+    EXPECT_FALSE(doOnEntry());
+    EXPECT_FALSE(doOnExit());
+
+    // call transition to move from NEW_ST to DUMMY_ST with START_EVT
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+    // We are transitioning states, so "do" flags should be true.
+    EXPECT_TRUE(doOnEntry());
+    EXPECT_TRUE(doOnExit());
+
+    // "do" flags are one-shots, so they should now both be false.
+    EXPECT_FALSE(doOnEntry());
+    EXPECT_FALSE(doOnExit());
+
+    // call transition to re-enter same state, "do" flags should be false.
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+    // "do" flags should be false.
+    EXPECT_FALSE(doOnEntry());
+    EXPECT_FALSE(doOnExit());
+
+}
+
+/// @brief Verifies that the model status methods accurately reflect the model
+/// status.  It also verifies that the dictionaries can be modified before
+/// the model is running but not after.
+TEST_F(StateModelTest, statusMethods) {
+    // Init dictionaries manually, normally done by startModel.
+    initDictionaries();
+
+    // After construction, state model is "new", all others should be false.
+    EXPECT_TRUE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_FALSE(isModelDone());
+    EXPECT_FALSE(didModelFail());
+
+    // Verify that events and states can be added before the model is started.
+    EXPECT_NO_THROW(defineEvent(9998, "9998"));
+    EXPECT_NO_THROW(defineState(9998, "9998",
+                                std::bind(&StateModelTest::readyHandler,
+                                          this)));
+
+    // "START" the model.
+    // Fake out starting the model by calling transition to move from NEW_ST
+    // to DUMMY_ST with START_EVT.  If we used startModel this would blow by
+    // the status  of "running" but not "waiting".
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+
+    // Verify that events and states cannot be added after the model is started.
+    EXPECT_THROW(defineEvent(9999, "9999"), StateModelError);
+    EXPECT_THROW(defineState(9999, "9999",
+                             std::bind(&StateModelTest::readyHandler, this)),
+                 StateModelError);
+
+    // The state and event combos set above, should show the model as
+    // "running", all others should be false.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_TRUE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_FALSE(isModelDone());
+    EXPECT_FALSE(didModelFail());
+
+    // call transition to submit NOP_EVT to current state, DUMMY_ST.
+    EXPECT_NO_THROW(transition(DUMMY_ST, NOP_EVT));
+
+    // Verify the status methods are correct: with next event set to NOP_EVT,
+    // model should be "running" and "waiting".
+    EXPECT_FALSE(isModelNew());
+    EXPECT_TRUE(isModelRunning());
+    EXPECT_TRUE(isModelWaiting());
+    EXPECT_FALSE(isModelDone());
+    EXPECT_FALSE(didModelFail());
+
+    // Call endModel to transition us to the end of the model.
+    EXPECT_NO_THROW(endModel());
+
+    // With state set to END_ST, model should be done.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+    EXPECT_FALSE(didModelFail());
+}
+
+/// @brief Tests that the model status methods are correct after a model
+/// failure.
+TEST_F(StateModelTest, statusMethodsOnFailure) {
+    // Construct the event and state definitions, normally done by startModel.
+    ASSERT_NO_THROW(defineEvents());
+    ASSERT_NO_THROW(verifyEvents());
+    ASSERT_NO_THROW(defineStates());
+    ASSERT_NO_THROW(verifyStates());
+
+    // call transition to move from NEW_ST to DUMMY_ST with START_EVT
+    EXPECT_NO_THROW(transition(DUMMY_ST, START_EVT));
+
+    // Call endModel to transition us to the end of the model.
+    EXPECT_NO_THROW(abortModel("test invocation"));
+
+    // With state set to END_ST, model should be done.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+    EXPECT_TRUE(didModelFail());
+}
+
+/// @brief Checks that the context strings accurately reflect context and
+/// are safe to invoke.
+TEST_F(StateModelTest, contextStrs) {
+    // Verify context methods do not throw prior to dictionary init.
+    ASSERT_NO_THROW(getContextStr());
+    ASSERT_NO_THROW(getPrevContextStr());
+
+    // Construct the event and state definitions, normally done by startModel.
+    ASSERT_NO_THROW(defineEvents());
+    ASSERT_NO_THROW(verifyEvents());
+    ASSERT_NO_THROW(defineStates());
+    ASSERT_NO_THROW(verifyStates());
+
+    // transition uses setState and setEvent, testing it tests all three.
+    EXPECT_NO_THROW(transition(READY_ST, START_EVT));
+
+    // Verify the current context string depicts correct state and event.
+    std::string ctx_str;
+    ASSERT_NO_THROW(ctx_str = getContextStr());
+    EXPECT_NE(std::string::npos, ctx_str.find(getStateLabel(READY_ST)));
+    EXPECT_NE(std::string::npos, ctx_str.find(getEventLabel(START_EVT)));
+
+    // Verify the previous context string depicts correct state and event.
+    ASSERT_NO_THROW(ctx_str = getPrevContextStr());
+    EXPECT_NE(std::string::npos, ctx_str.find(getStateLabel(NEW_ST)));
+    EXPECT_NE(std::string::npos, ctx_str.find(getEventLabel(NOP_EVT)));
+}
+
+/// @brief Tests that undefined states are handled gracefully.
+/// This test verifies that attempting to transition to an undefined state,
+/// which constitutes a model violation, results in an orderly model failure.
+TEST_F(StateModelTest, undefinedState) {
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+    EXPECT_FALSE(getWorkCompleted());
+
+    // First, lets execute the state model to a known valid point, by
+    // calling startModel. This should run the model through to DO_WORK_ST.
+    ASSERT_NO_THROW(startModel(READY_ST));
+
+    // Verify we are in the state of DO_WORK_ST with event of NOP_EVT.
+    EXPECT_EQ(DO_WORK_ST, getCurrState());
+    EXPECT_EQ(NOP_EVT, getNextEvent());
+
+    // Resume the model with next event set to cause the DO_WORK_ST handler
+    // to transition to an undefined state. This should cause it to return
+    // without throwing and yield a failed model.
+    EXPECT_NO_THROW(runModel(FORCE_UNDEFINED_ST_EVT));
+
+    // Verify that status methods are correct: model is done but failed.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+    EXPECT_TRUE(didModelFail());
+
+    // Verify that failure explanation is not empty.
+    EXPECT_FALSE(getFailureExplanation().empty());
+
+    // Verify that work completed flag is still false.
+    EXPECT_FALSE(getWorkCompleted());
+}
+
+/// @brief Tests that an unexpected exception thrown by a state handler is
+/// handled gracefully.  State models are supposed to account for and handle
+/// all errors that they actions (i.e. handlers) may cause.  In the event they
+/// do not, this constitutes a model violation.  This test verifies such
+/// violations are handled correctly and result in an orderly model failure.
+TEST_F(StateModelTest, unexpectedError) {
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+    EXPECT_FALSE(getWorkCompleted());
+
+    // First, lets execute the state model to a known valid point, by
+    // calling startModel with a start state of READY_ST.
+    // This should run the model through to DO_WORK_ST.
+    ASSERT_NO_THROW(startModel(READY_ST));
+
+    // Verify we are in the state of DO_WORK_ST with event of NOP_EVT.
+    EXPECT_EQ(DO_WORK_ST, getCurrState());
+    EXPECT_EQ(NOP_EVT, getNextEvent());
+
+    // Resume the model with next event set to cause the DO_WORK_ST handler
+    // to transition to an undefined state. This should cause it to return
+    // without throwing and yield a failed model.
+    EXPECT_NO_THROW(runModel(SIMULATE_ERROR_EVT));
+
+    // Verify that status methods are correct: model is done but failed.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+    EXPECT_TRUE(didModelFail());
+
+    // Verify that failure explanation is not empty.
+    EXPECT_FALSE(getFailureExplanation().empty());
+
+    // Verify that work completed flag is still false.
+    EXPECT_FALSE(getWorkCompleted());
+}
+
+/// @brief Tests that undefined events are handled gracefully.
+/// This test verifies that submitting an undefined event to the state machine
+/// results, which constitutes a model violation, results in an orderly model
+/// failure.
+TEST_F(StateModelTest, undefinedEvent) {
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+    EXPECT_FALSE(getWorkCompleted());
+
+    // First, lets execute the state model to a known valid point, by
+    // calling startModel with a start state of READY_ST.
+    // This should run the model through to DO_WORK_ST.
+    ASSERT_NO_THROW(startModel(READY_ST));
+
+    // Verify we are in the state of DO_WORK_ST with event of NOP_EVT.
+    EXPECT_EQ(DO_WORK_ST, getCurrState());
+    EXPECT_EQ(NOP_EVT, getNextEvent());
+
+    // Attempting to post an undefined event within runModel should cause it
+    // to return without throwing and yield a failed model.
+    EXPECT_NO_THROW(runModel(9999));
+
+    // Verify that status methods are correct: model is done but failed.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+    EXPECT_TRUE(didModelFail());
+
+    // Verify that failure explanation is not empty.
+    EXPECT_FALSE(getFailureExplanation().empty());
+
+    // Verify that work completed flag is still false.
+    EXPECT_FALSE(getWorkCompleted());
+}
+
+/// @brief Test the basic mechanics of state model execution.
+/// This test exercises the ability to execute state model from start to
+/// finish, including the handling of a asynchronous IO operation.
+TEST_F(StateModelTest, stateModelTest) {
+    // Verify that status methods are correct: model is new.
+    EXPECT_TRUE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_FALSE(isModelDone());
+
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+    EXPECT_FALSE(getWorkCompleted());
+
+    // Launch the transaction by calling startModel.  The state model
+    // should run up until the simulated async work operation is initiated
+    // in DO_WORK_ST.
+    ASSERT_NO_THROW(startModel(READY_ST));
+
+    // Verify that we are now in state of DO_WORK_ST, the last event was
+    // WORK_START_EVT, the next event is NOP_EVT.
+    EXPECT_EQ(DO_WORK_ST, getCurrState());
+    EXPECT_EQ(WORK_START_EVT, getLastEvent());
+    EXPECT_EQ(NOP_EVT, getNextEvent());
+
+    // Simulate completion of async work completion by resuming runModel with
+    // an event of WORK_DONE_EVT.
+    ASSERT_NO_THROW(runModel(WORK_DONE_EVT));
+
+    // Verify that the state model has progressed through to completion:
+    // it is in the DONE_ST, the status is ST_COMPLETED, and the next event
+    // is NOP_EVT.
+    EXPECT_EQ(END_ST, getCurrState());
+    EXPECT_EQ(END_EVT, getNextEvent());
+
+    // Verify that status methods are correct: model done.
+    EXPECT_FALSE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_TRUE(isModelDone());
+
+    // Verify that failure explanation is empty.
+    EXPECT_TRUE(getFailureExplanation().empty());
+
+    // Verify that work completed flag is true.
+    EXPECT_TRUE(getWorkCompleted());
+}
+
+// This test verifies the pausing and un-pausing capabilities of the state
+// model.
+TEST_F(StateModelTest, stateModelPause) {
+    // Verify that status methods are correct: model is new.
+    EXPECT_TRUE(isModelNew());
+    EXPECT_FALSE(isModelRunning());
+    EXPECT_FALSE(isModelWaiting());
+    EXPECT_FALSE(isModelDone());
+    EXPECT_FALSE(isModelPaused());
+
+    // Verify that the failure explanation is empty and work is not done.
+    EXPECT_TRUE(getFailureExplanation().empty());
+    EXPECT_FALSE(getWorkCompleted());
+
+    // Transition straight to the state in which the model should always
+    // pause.
+    ASSERT_NO_THROW(startModel(PAUSE_ALWAYS_ST));
+
+    // Verify it was successful and that the model is paused.
+    EXPECT_EQ(PAUSE_ALWAYS_ST, getCurrState());
+    EXPECT_TRUE(isModelPaused());
+
+    // Run the model again. It should still be paused.
+    ASSERT_NO_THROW(runModel(NOP_EVT));
+    EXPECT_TRUE(isModelPaused());
+
+    // Unpause the model and transition to the state in which the model
+    // should be paused at most once.
+    unpauseModel();
+    transition(PAUSE_ONCE_ST, NOP_EVT);
+    EXPECT_EQ(PAUSE_ONCE_ST, getCurrState());
+    EXPECT_TRUE(isModelPaused());
+
+    // The model should still be paused until explicitly unpaused.
+    ASSERT_NO_THROW(runModel(NOP_EVT));
+    EXPECT_EQ(PAUSE_ONCE_ST, getCurrState());
+    EXPECT_TRUE(isModelPaused());
+
+    unpauseModel();
+
+    // Transition back to the first state. The model should pause again.
+    transition(PAUSE_ALWAYS_ST, NOP_EVT);
+    EXPECT_EQ(PAUSE_ALWAYS_ST, getCurrState());
+    EXPECT_TRUE(isModelPaused());
+
+    ASSERT_NO_THROW(runModel(NOP_EVT));
+    EXPECT_EQ(PAUSE_ALWAYS_ST, getCurrState());
+    EXPECT_TRUE(isModelPaused());
+
+    // Unpause the model and transition to the state in which the model
+    // should pause only once. This time it should not pause.
+    unpauseModel();
+    transition(PAUSE_ONCE_ST, NOP_EVT);
+    EXPECT_EQ(PAUSE_ONCE_ST, getCurrState());
+    EXPECT_FALSE(isModelPaused());
+}
+
+}
diff --git a/src/lib/util/tests/stopwatch_unittest.cc b/src/lib/util/tests/stopwatch_unittest.cc
new file mode 100644
index 0000000..a506b6b
--- /dev/null
+++ b/src/lib/util/tests/stopwatch_unittest.cc
@@ -0,0 +1,307 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/stopwatch.h>
+#include <util/stopwatch_impl.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+#include <unistd.h>
+
+namespace {
+
+using namespace isc;
+using namespace isc::util;
+using namespace boost::posix_time;
+
+/// @brief @c StopwatchImpl mock object.
+///
+/// This class derives from the @c StopwatchImpl to override the
+/// @c StopwatchImpl::getCurrentTime. This method is internally called by
+/// the @c StopwatchImpl to determine the current time. By providing the
+/// implementation of this method which returns the fixed (well known)
+/// timestamp value we can obtain the deterministic values from the accessors
+/// of this class.
+///
+/// This class also includes some convenience methods to return the time
+/// durations in milliseconds.
+class StopwatchMock : public StopwatchImpl {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// @param ref_time Reference time, i.e. the arbitrary time value from
+    /// which time is measured. The @c current_time_ value returned by the
+    /// @c StopwatchMock::getCurrentTime is initialized to this value.
+    /// Subsequent calls to the @c StopwatchMock::ffwd move the value of
+    /// the @c current_time_ forward.
+    StopwatchMock(const ptime& ref_time);
+
+    /// @brief Fast forward time.
+    ///
+    /// Moves the value of the @c current_time_ forward by the specified
+    /// number of milliseconds (microseconds). As a result the timestamp
+    /// returned by the @c StopwatchMock::getCurrentTime moves by this value.
+    /// This simulates the time progress.
+    ///
+    /// @param ms Specifies the number of milliseconds to move current time.
+    /// @param us Specifies the number of fractional microseconds to move
+    /// current time.
+    void ffwd(const uint32_t ms, const uint32_t us = 0);
+
+    /// @brief Returns the last duration in milliseconds.
+    uint32_t getLastDurationInMs() const;
+
+    /// @brief Returns the total duration in milliseconds.
+    uint32_t getTotalDurationInMs() const;
+
+protected:
+
+    /// @brief Returns the current time.
+    ///
+    /// This method returns the fixed @c current_time_ timestamp.
+    virtual ptime getCurrentTime() const;
+
+private:
+
+    /// @brief Holds the current time to be returned by the
+    /// @c StopwatchMock::getCurrentTime.
+    ptime current_time_;
+
+};
+
+StopwatchMock::StopwatchMock(const ptime& ref_time)
+    : StopwatchImpl(), current_time_(ref_time) {
+}
+
+void
+StopwatchMock::ffwd(const uint32_t ms, const uint32_t us) {
+    current_time_ += milliseconds(ms);
+    current_time_ += microseconds(us);
+}
+
+uint32_t
+StopwatchMock::getLastDurationInMs() const {
+    return (getLastDuration().total_milliseconds());
+}
+
+uint32_t
+StopwatchMock::getTotalDurationInMs() const {
+    return (getTotalDuration().total_milliseconds());
+}
+
+ptime
+StopwatchMock::getCurrentTime() const {
+    return (current_time_);
+}
+
+/// @brief Test fixture class for testing @c StopwatchImpl.
+class StopwatchTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    StopwatchTest() = default;
+
+    /// @brief Destructor
+    virtual ~StopwatchTest() = default;
+
+protected:
+
+    /// @brief Set up the test.
+    ///
+    /// Initializes the reference time to be used to create the instances
+    /// of the @c StopwatchMock objects.
+    virtual void SetUp();
+
+    /// @brief Holds the reference time to be used to create the instances
+    /// of the @c StopwatchMock objects.
+    ptime ref_time_;
+};
+
+void
+StopwatchTest::SetUp() {
+    ref_time_ = microsec_clock::universal_time();
+}
+
+/// This test checks the behavior of the stopwatch when it is started
+/// and stopped multiple times. It uses the StopwatchMock object to
+/// control the "time flow" by setting the current time to arbitrary
+/// values using the StopwatchMock::ffwd. In addition, this test
+/// checks that the stopwatch can be reset.
+TEST_F(StopwatchTest, multipleMeasurements) {
+    StopwatchMock stopwatch(ref_time_);
+    // The stopwatch shouldn't automatically start. The initial
+    // durations should be set to 0.
+    EXPECT_EQ(0, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(0, stopwatch.getTotalDurationInMs());
+
+    stopwatch.start();
+
+    // Even though the stopwatch is started, the time is still set to
+    // the initial value. The durations should not be affected.
+    EXPECT_EQ(0, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(0, stopwatch.getTotalDurationInMs());
+
+    // Move the time by 10 ms.
+    stopwatch.ffwd(10);
+
+    // It should be possible to retrieve the durations even when the
+    // stopwatch is running.
+    EXPECT_EQ(10, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(10, stopwatch.getTotalDurationInMs());
+
+    // Now stop it and make sure that the same values are returned.
+    stopwatch.stop();
+
+    EXPECT_EQ(10, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(10, stopwatch.getTotalDurationInMs());
+
+    // Start it again, but don't move the time forward yet.
+    stopwatch.start();
+
+    // The new duration should be 0, but the total should be equal to
+    // the previously measured duration.
+    EXPECT_EQ(0, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(10, stopwatch.getTotalDurationInMs());
+
+    // Move time by 5 ms.
+    stopwatch.ffwd(5);
+
+    // New measured duration should be 5 ms. The total should be 15 ms.
+    EXPECT_EQ(5, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(15, stopwatch.getTotalDurationInMs());
+
+    // Stop it again and make sure the values returned are the same.
+    stopwatch.stop();
+
+    EXPECT_EQ(5, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(15, stopwatch.getTotalDurationInMs());
+
+    // Move the time forward while the stopwatch is stopped.
+    stopwatch.ffwd(8);
+
+    // The measured values should not be affected.
+    EXPECT_EQ(5, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(15, stopwatch.getTotalDurationInMs());
+
+    // Stop should be no-op in this case.
+    stopwatch.stop();
+
+    EXPECT_EQ(5, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(15, stopwatch.getTotalDurationInMs());
+
+    // Start the stopwatch again.
+    stopwatch.start();
+
+    // Move time by 3 ms.
+    stopwatch.ffwd(3);
+
+    // Since the stopwatch is running, the measured duration should
+    // get updated again.
+    EXPECT_EQ(3, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(18, stopwatch.getTotalDurationInMs());
+
+    // Move the time by 2 ms.
+    stopwatch.ffwd(2);
+
+    // Start should be no-op in this case.
+    stopwatch.start();
+
+    // But the durations should be updated.
+    EXPECT_EQ(5, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(20, stopwatch.getTotalDurationInMs());
+
+    // Make sure we can reset.
+    stopwatch.reset();
+
+    EXPECT_EQ(0, stopwatch.getLastDurationInMs());
+    EXPECT_EQ(0, stopwatch.getTotalDurationInMs());
+}
+
+// This test checks that the stopwatch works when the real clock is in use.
+TEST_F(StopwatchTest, realTime) {
+    // Initially, the measured time should be 0.
+    Stopwatch stopwatch;
+    EXPECT_EQ(0, stopwatch.getLastMilliseconds());
+    EXPECT_EQ(0, stopwatch.getTotalMilliseconds());
+
+    // Start the stopwatch.
+    stopwatch.start();
+
+    // Sleep for 1 ms. The stopwatch should measure this duration.
+    usleep(1000);
+
+    stopwatch.stop();
+
+    // The measured duration should be greater or equal 1 ms.
+    long current_duration = stopwatch.getLastMilliseconds();
+    EXPECT_GE(current_duration, 1);
+    EXPECT_EQ(current_duration, stopwatch.getTotalMilliseconds());
+
+    // Sleep for another 2 ms while the stopwatch is in the stopped state.
+    usleep(2000);
+
+    // In the stopped state, we should still have old durations measured.
+    EXPECT_EQ(current_duration, stopwatch.getLastMilliseconds());
+    EXPECT_EQ(current_duration, stopwatch.getTotalMilliseconds());
+
+    // Start it again.
+    stopwatch.start();
+
+    // Sleep for 1 ms.
+    usleep(1000);
+
+    // The durations should get updated as appropriate.
+    EXPECT_GE(stopwatch.getLastMilliseconds(), 1);
+    EXPECT_GE(stopwatch.getTotalMilliseconds(), 2);
+}
+
+// Make sure that we can obtain the durations as microseconds.
+TEST_F(StopwatchTest, getLastMicroseconds) {
+    Stopwatch stopwatch;
+    stopwatch.start();
+
+    usleep(1000);
+
+    stopwatch.stop();
+
+    long current_duration = stopwatch.getLastMicroseconds();
+    EXPECT_GE(current_duration, 1000);
+    EXPECT_EQ(current_duration, stopwatch.getTotalMicroseconds());
+}
+
+// Make sure that we can use the "autostart" option to start the time
+// measurement in the constructor.
+TEST_F(StopwatchTest, autostart) {
+    Stopwatch stopwatch(true);
+    usleep(1000);
+
+    stopwatch.stop();
+
+    EXPECT_GE(stopwatch.getLastMilliseconds(), 1);
+    EXPECT_EQ(stopwatch.getLastMilliseconds(), stopwatch.getTotalMilliseconds());
+}
+
+// Make sure that the conversion to the loggable string works as expected.
+TEST_F(StopwatchTest, logFormat) {
+    time_duration duration = microseconds(223043);
+    EXPECT_EQ("223.043 ms", StopwatchImpl::logFormat(duration));
+
+    duration = microseconds(1234);
+    EXPECT_EQ("1.234 ms", StopwatchImpl::logFormat(duration));
+
+    duration = microseconds(2000);
+    EXPECT_EQ("2.000 ms", StopwatchImpl::logFormat(duration));
+
+    duration = milliseconds(2100);
+    EXPECT_EQ("2.10 s", StopwatchImpl::logFormat(duration));
+
+    duration = milliseconds(3123);
+    EXPECT_EQ("3.12 s", StopwatchImpl::logFormat(duration));
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/str_unittests.cc b/src/lib/util/tests/str_unittests.cc
new file mode 100644
index 0000000..78d28ce
--- /dev/null
+++ b/src/lib/util/tests/str_unittests.cc
@@ -0,0 +1,529 @@
+// Copyright (C) 2011-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <testutils/gtest_utils.h>
+#include <util/encode/encode.h>
+#include <util/str.h>
+
+#include <cstdint>
+#include <exception>
+#include <sstream>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::util;
+using namespace isc::util::encode;
+using namespace isc::util::str;
+using namespace std;
+
+namespace {
+
+/// @brief Fixture used to test StringSanitizer.
+struct StringUtilTest : ::testing::Test {
+    /// @brief Pass string through scrub and check the result.
+    ///
+    /// @param original The string to sanitize.
+    /// @param char_set The regular expression string describing invalid characters.
+    /// @param char_replacement - character(s) which replace invalid
+    /// characters
+    /// @param expected - expected sanitized string
+    void checkScrub(const string& original,
+                    const string& char_set,
+                    const string& char_replacement,
+                    const string& expected) {
+        StringSanitizerPtr ss;
+        string sanitized;
+
+        try {
+            ss.reset(new StringSanitizer(char_set, char_replacement));
+        } catch (const exception& ex) {
+            ADD_FAILURE() << "Could not construct sanitizer:" << ex.what();
+            return;
+        }
+
+        try {
+            sanitized = ss->scrub(original);
+        } catch (const exception& ex) {
+            ADD_FAILURE() << "Could not scrub string:" << ex.what();
+            return;
+        }
+
+        EXPECT_EQ(sanitized, expected);
+    }
+
+    /// @brief Check that hex strings with colons can be decoded.
+    ///
+    /// @param input Input string to be decoded.
+    /// @param reference The expected result.
+    void checkColonSeparated(const string& input, const string& reference) {
+        // Create a reference vector.
+        vector<uint8_t> reference_vector;
+        ASSERT_NO_THROW_LOG(decodeHex(reference, reference_vector));
+
+        // Fill the output vector with some garbage to make sure that
+        // the data is erased when a string is decoded successfully.
+        vector<uint8_t> decoded(1, 10);
+        ASSERT_NO_THROW_LOG(decodeColonSeparatedHexString(input, decoded));
+
+        // Get the string representation of the decoded data for logging
+        // purposes.
+        string encoded;
+        ASSERT_NO_THROW_LOG(encoded = encodeHex(decoded));
+
+        // Check if the decoded data matches the reference.
+        EXPECT_EQ(decoded, reference_vector) << "decoded data don't match the reference, input='"
+                                             << input << "', reference='" << reference
+                                             << "'"
+                                                ", decoded='"
+                                             << encoded << "'";
+    }
+
+    /// @brief Check that formatted hex strings can be decoded.
+    ///
+    /// @param input Input string to be decoded.
+    /// @param reference The expected result.
+    void checkFormatted(const string& input, const string& reference) {
+        // Create a reference vector.
+        vector<uint8_t> reference_vector;
+        ASSERT_NO_THROW_LOG(decodeHex(reference, reference_vector));
+
+        // Fill the output vector with some garbage to make sure that
+        // the data is erased when a string is decoded successfully.
+        vector<uint8_t> decoded(1, 10);
+        ASSERT_NO_THROW_LOG(decodeFormattedHexString(input, decoded));
+
+        // Get the string representation of the decoded data for logging
+        // purposes.
+        string encoded;
+        ASSERT_NO_THROW_LOG(encoded = encodeHex(decoded));
+
+        // Check if the decoded data matches the reference.
+        EXPECT_EQ(decoded, reference_vector)
+            << "decoded data don't match the reference, input='" << input << "', reference='"
+            << reference << "', decoded='" << encoded << "'";
+    }
+
+    /// @brief Convenience function which calls quotedStringToBinary
+    /// and converts returned vector back to string.
+    ///
+    /// @param s Input string.
+    ///
+    /// @return String holding a copy of a vector returned by the
+    /// quotedStringToBinary.
+    string checkQuoted(const string& s) {
+        vector<uint8_t> vec = quotedStringToBinary(s);
+        string s2(vec.begin(), vec.end());
+        return (s2);
+    }
+};
+
+// Check that leading and trailing space trimming works.
+TEST_F(StringUtilTest, Trim) {
+    // Empty and full string.
+    EXPECT_EQ("", trim(""));
+    EXPECT_EQ("abcxyz", trim("abcxyz"));
+
+    // Trim right-most blanks
+    EXPECT_EQ("ABC", trim("ABC   "));
+    EXPECT_EQ("ABC", trim("ABC\t\t  \n\t"));
+
+    // Left-most blank trimming
+    EXPECT_EQ("XYZ", trim("  XYZ"));
+    EXPECT_EQ("XYZ", trim("\t\t  \tXYZ"));
+
+    // Right and left, with embedded spaces
+    EXPECT_EQ("MN \t OP", trim("\t\tMN \t OP \t"));
+}
+
+// Check tokenization.
+TEST_F(StringUtilTest, Tokens) {
+    vector<string> result;
+
+    // Default delimiters
+
+    // Degenerate cases
+    result = tokens("");  // Empty string
+    EXPECT_EQ(0, result.size());
+
+    result = tokens(" \n ");  // String is all delimiters
+    EXPECT_EQ(0, result.size());
+
+    result = tokens("abc");  // String has no delimiters
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("abc"), result[0]);
+
+    // String containing leading and/or trailing delimiters, no embedded ones.
+    result = tokens("\txyz");  // One leading delimiter
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("xyz"), result[0]);
+
+    result = tokens("\t \nxyz");  // Multiple leading delimiters
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("xyz"), result[0]);
+
+    result = tokens("xyz\n");  // One trailing delimiter
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("xyz"), result[0]);
+
+    result = tokens("xyz  \t");  // Multiple trailing
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("xyz"), result[0]);
+
+    result = tokens("\t xyz \n");  // Leading and trailing
+    ASSERT_EQ(1, result.size());
+    EXPECT_EQ(string("xyz"), result[0]);
+
+    // Embedded delimiters
+    result = tokens("abc\ndef");  // 2 tokens, one separator
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("abc"), result[0]);
+    EXPECT_EQ(string("def"), result[1]);
+
+    result = tokens("abc\t\t\ndef");  // 2 tokens, 3 separators
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("abc"), result[0]);
+    EXPECT_EQ(string("def"), result[1]);
+
+    result = tokens("abc\n  \tdef\t\tghi");
+    ASSERT_EQ(3, result.size());  // Multiple tokens, many delims
+    EXPECT_EQ(string("abc"), result[0]);
+    EXPECT_EQ(string("def"), result[1]);
+    EXPECT_EQ(string("ghi"), result[2]);
+
+    // Embedded and non-embedded delimiters
+
+    result = tokens("\t\t  \nabc\n  \tdef\t\tghi   \n\n");
+    ASSERT_EQ(3, result.size());  // Multiple tokens, many delims
+    EXPECT_EQ(string("abc"), result[0]);
+    EXPECT_EQ(string("def"), result[1]);
+    EXPECT_EQ(string("ghi"), result[2]);
+
+    // Non-default delimiter
+    result = tokens("alpha/beta/ /gamma//delta/epsilon/", "/");
+    ASSERT_EQ(6, result.size());
+    EXPECT_EQ(string("alpha"), result[0]);
+    EXPECT_EQ(string("beta"), result[1]);
+    EXPECT_EQ(string(" "), result[2]);
+    EXPECT_EQ(string("gamma"), result[3]);
+    EXPECT_EQ(string("delta"), result[4]);
+    EXPECT_EQ(string("epsilon"), result[5]);
+
+    // Non-default delimiters (plural)
+    result = tokens("+*--alpha*beta+ -gamma**delta+epsilon-+**", "*+-");
+    ASSERT_EQ(6, result.size());
+    EXPECT_EQ(string("alpha"), result[0]);
+    EXPECT_EQ(string("beta"), result[1]);
+    EXPECT_EQ(string(" "), result[2]);
+    EXPECT_EQ(string("gamma"), result[3]);
+    EXPECT_EQ(string("delta"), result[4]);
+    EXPECT_EQ(string("epsilon"), result[5]);
+
+    // Escaped delimiter
+    result = tokens("foo\\,bar", ",", true);
+    EXPECT_EQ(1, result.size());
+    EXPECT_EQ(string("foo,bar"), result[0]);
+
+    // Escaped escape
+    result = tokens("foo\\\\,bar", ",", true);
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("foo\\"), result[0]);
+    EXPECT_EQ(string("bar"), result[1]);
+
+    // Double escapes
+    result = tokens("foo\\\\\\\\,\\bar", ",", true);
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("foo\\\\"), result[0]);
+    EXPECT_EQ(string("\\bar"), result[1]);
+
+    // Escaped standard character
+    result = tokens("fo\\o,bar", ",", true);
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("fo\\o"), result[0]);
+    EXPECT_EQ(string("bar"), result[1]);
+
+    // Escape at the end
+    result = tokens("foo,bar\\", ",", true);
+    ASSERT_EQ(2, result.size());
+    EXPECT_EQ(string("foo"), result[0]);
+    EXPECT_EQ(string("bar\\"), result[1]);
+
+    // Escape opening a token
+    result = tokens("foo,\\,,bar", ",", true);
+    ASSERT_EQ(3, result.size());
+    EXPECT_EQ(string("foo"), result[0]);
+    EXPECT_EQ(string(","), result[1]);
+    EXPECT_EQ(string("bar"), result[2]);
+}
+
+// Check changing of case.
+TEST_F(StringUtilTest, ChangeCase) {
+    string mixed("abcDEFghiJKLmno123[]{=+--+]}");
+    string upper("ABCDEFGHIJKLMNO123[]{=+--+]}");
+    string lower("abcdefghijklmno123[]{=+--+]}");
+
+    string test = mixed;
+    lowercase(test);
+    EXPECT_EQ(lower, test);
+
+    test = mixed;
+    uppercase(test);
+    EXPECT_EQ(upper, test);
+}
+
+TEST_F(StringUtilTest, quotedStringToBinary) {
+    // No opening or closing quote should result in empty string.
+    EXPECT_TRUE(quotedStringToBinary("'").empty());
+    EXPECT_TRUE(quotedStringToBinary("").empty());
+    EXPECT_TRUE(quotedStringToBinary("  ").empty());
+    EXPECT_TRUE(quotedStringToBinary("'circuit id").empty());
+    EXPECT_TRUE(quotedStringToBinary("circuit id'").empty());
+
+    // If there is only opening and closing quote, an empty
+    // vector should be returned.
+    EXPECT_TRUE(quotedStringToBinary("''").empty());
+
+    // Both opening and ending quote is present.
+    EXPECT_EQ("circuit id", checkQuoted("'circuit id'"));
+    EXPECT_EQ("remote id", checkQuoted("  ' remote id'"));
+    EXPECT_EQ("duid", checkQuoted("  ' duid'"));
+    EXPECT_EQ("duid", checkQuoted("'duid    '  "));
+    EXPECT_EQ("remote'id", checkQuoted("  ' remote'id  '"));
+    EXPECT_EQ("remote id'", checkQuoted("'remote id''"));
+    EXPECT_EQ("'remote id", checkQuoted("''remote id'"));
+
+    // Multiple quotes.
+    EXPECT_EQ("'", checkQuoted("'''"));
+    EXPECT_EQ("''", checkQuoted("''''"));
+}
+
+TEST_F(StringUtilTest, decodeColonSeparatedHexString) {
+    // Test valid strings.
+    checkColonSeparated("A1:02:C3:d4:e5:F6", "A102C3D4E5F6");
+    checkColonSeparated("A:02:3:d:E5:F6", "0A02030DE5F6");
+    checkColonSeparated("A:B:C:D", "0A0B0C0D");
+    checkColonSeparated("1", "01");
+    checkColonSeparated("1e", "1E");
+    checkColonSeparated("", "");
+
+    // Test invalid strings.
+    vector<uint8_t> decoded;
+    // Whitespaces.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("   ", decoded), BadValue,
+                     "invalid format of the decoded string '   '");
+    // Whitespace before digits.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString(" A1", decoded), BadValue,
+                     "invalid format of the decoded string ' A1'");
+    // Two consecutive colons.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("A::01", decoded), BadValue,
+                     "two consecutive separators (':') specified in a decoded string 'A::01'");
+    // Three consecutive colons.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("A:::01", decoded), BadValue,
+                     "two consecutive separators (':') specified in a decoded string 'A:::01'");
+    // Whitespace within a string.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("A :01", decoded), BadValue,
+                     "' ' is not a valid hexadecimal digit in decoded string 'A :01'");
+    // Terminating colon.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("0A:01:", decoded), BadValue,
+                     "two consecutive separators (':') specified in a decoded string '0A:01:'");
+    // Opening colon.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString(":0A:01", decoded), BadValue,
+                     "two consecutive separators (':') specified in a decoded string ':0A:01'");
+    // Three digits before the colon.
+    EXPECT_THROW_MSG(decodeColonSeparatedHexString("0A1:B1", decoded), BadValue,
+                     "invalid format of the decoded string '0A1:B1'");
+}
+
+TEST_F(StringUtilTest, decodeFormattedHexString) {
+    // Colon separated.
+    checkFormatted("1:A7:B5:4:23", "01A7B50423");
+    // Space separated.
+    checkFormatted("1 A7 B5 4 23", "01A7B50423");
+    // No colons, even number of digits.
+    checkFormatted("17a534", "17A534");
+    // Odd number of digits.
+    checkFormatted("A3A6f78", "0A3A6F78");
+    // '0x' prefix.
+    checkFormatted("0xA3A6f78", "0A3A6F78");
+    // '0x' prefix with a special value of 0.
+    checkFormatted("0x0", "00");
+    // Empty string.
+    checkFormatted("", "");
+
+    vector<uint8_t> decoded;
+    // Dangling colon.
+    EXPECT_THROW_MSG(decodeFormattedHexString("0a:", decoded), BadValue,
+                     "two consecutive separators (':') specified in a decoded string '0a:'");
+    // Dangling space.
+    EXPECT_THROW_MSG(decodeFormattedHexString("0a ", decoded), BadValue,
+                     "two consecutive separators (' ') specified in a decoded string '0a '");
+    // '0x' prefix and spaces.
+    EXPECT_THROW_MSG(decodeFormattedHexString("0x01 02", decoded), BadValue,
+                     "invalid format of the decoded string '0x01 02'");
+    // '0x' prefix and colons.
+    EXPECT_THROW_MSG(decodeFormattedHexString("0x01:02", decoded), BadValue,
+                     "invalid format of the decoded string '0x01:02'");
+    // colon and spaces mixed
+    EXPECT_THROW_MSG(decodeFormattedHexString("01:02 03", decoded), BadValue,
+                     "invalid format of the decoded string '01:02 03'");
+    // Missing colon.
+    EXPECT_THROW_MSG(decodeFormattedHexString("01:0203", decoded), BadValue,
+                     "invalid format of the decoded string '01:0203'");
+    // Missing space.
+    EXPECT_THROW_MSG(decodeFormattedHexString("01 0203", decoded), BadValue,
+                     "invalid format of the decoded string '01 0203'");
+    // Invalid prefix.
+    EXPECT_THROW_MSG(decodeFormattedHexString("x0102", decoded), BadValue,
+                     "'x0102' is not a valid string of hexadecimal digits");
+    // Invalid prefix again.
+    EXPECT_THROW_MSG(decodeFormattedHexString("1x0102", decoded), BadValue,
+                     "'1x0102' is not a valid string of hexadecimal digits");
+}
+
+// Verifies StringSantizer class
+TEST_F(StringUtilTest, stringSanitizer) {
+    // Bad regular expression should throw.
+    StringSanitizerPtr ss;
+
+    try {
+        ss.reset(new StringSanitizer("[bogus-regex", ""));
+    } catch (BadValue const& ex) {
+        unordered_set<string> expected{
+            // BSD
+            "invalid regex: '[bogus-regex', The expression contained mismatched [ and ].",
+            // Linux
+            "invalid regex: '[bogus-regex', Invalid range in bracket expression.",
+        };
+        if (!expected.count(ex.what())) {
+            FAIL() << "unexpected BadValue exception message: " << ex.what();
+        }
+    } catch (exception const& ex) {
+        FAIL() << "unexpected exception: " << ex.what();
+    }
+
+    string good_data(StringSanitizer::MAX_DATA_SIZE, '0');
+    string bad_data(StringSanitizer::MAX_DATA_SIZE + 1, '0');
+
+    ASSERT_NO_THROW_LOG(ss.reset(new StringSanitizer(good_data, good_data)));
+
+    ASSERT_THROW_MSG(ss.reset(new StringSanitizer(bad_data, "")), BadValue,
+                     "char set size: '4097' exceeds max size: '4096'");
+    ASSERT_THROW_MSG(ss.reset(new StringSanitizer("", bad_data)), BadValue,
+                     "char replacement size: '4097' exceeds max size: '4096'");
+
+    // List of invalid chars should work: (b,c,2 are invalid)
+    checkScrub("abc.123", "[b-c2]", "*", "a**.1*3");
+    // Inverted list of valid chars should work: (b,c,2 are valid)
+    checkScrub("abc.123", "[^b-c2]", "*", "*bc**2*");
+
+    // A string of all valid chars should return an identical string.
+    checkScrub("-_A--B__Cabc34567_-", "[^A-Ca-c3-7_-]", "x", "-_A--B__Cabc34567_-");
+
+    // Replacing with a character should work.
+    checkScrub("A[b]c\12JoE3-_x!B$Y#e", "[^A-Za-z0-9_]", "*", "A*b*c*JoE3*_x*B*Y*e");
+
+    // Removing (i.e.replacing with an "empty" string) should work.
+    checkScrub("A[b]c\12JoE3-_x!B$Y#e", "[^A-Za-z0-9_]", "", "AbcJoE3_xBYe");
+
+    // More than one non-matching in a row should work.
+    checkScrub("%%A%%B%%C%%", "[^A-Za-z0-9_]", "x", "xxAxxBxxCxx");
+
+    // Removing more than one non-matching in a row should work.
+    checkScrub("%%A%%B%%C%%", "[^A-Za-z0-9_]", "", "ABC");
+
+    // Replacing with a string should work.
+    checkScrub("%%A%%B%%C%%", "[^A-Za-z0-9_]", "xyz", "xyzxyzAxyzxyzBxyzxyzCxyzxyz");
+
+    // Dots as valid chars work.
+    checkScrub("abc.123", "[^A-Za-z0-9_.]", "*", "abc.123");
+
+    string withNulls("\000ab\000c.12\0003", 10);
+    checkScrub(withNulls, "[^A-Za-z0-9_.]", "*", "*ab*c.12*3");
+}
+
+// Verifies templated buffer iterator seekTrimmed() function
+TEST_F(StringUtilTest, seekTrimmed) {
+    // Empty buffer should be fine.
+    vector<uint8_t> buffer;
+    auto begin = buffer.end();
+    auto end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 0));
+    EXPECT_EQ(0, distance(begin, end));
+
+    // Buffer of only trim values, should be fine.
+    buffer = {1, 1};
+    begin = buffer.begin();
+    end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 1));
+    EXPECT_EQ(0, distance(begin, end));
+
+    // One trailing null should trim off.
+    buffer = {'o', 'n', 'e', 0};
+    begin = buffer.begin();
+    end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 0));
+    EXPECT_EQ(3, distance(begin, end));
+
+    // More than one trailing null should trim off.
+    buffer = {'t', 'h', 'r', 'e', 'e', 0, 0, 0};
+    begin = buffer.begin();
+    end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 0));
+    EXPECT_EQ(5, distance(begin, end));
+
+    // Embedded null should be left in place.
+    buffer = {'e', 'm', 0, 'b', 'e', 'd'};
+    begin = buffer.begin();
+    end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 0));
+    EXPECT_EQ(6, distance(begin, end));
+
+    // Leading null should be left in place.
+    buffer = {0, 'l', 'e', 'a', 'd', 'i', 'n', 'g'};
+    begin = buffer.begin();
+    end = buffer.end();
+    ASSERT_NO_THROW_LOG(end = seekTrimmed(begin, end, 0));
+    EXPECT_EQ(8, distance(begin, end));
+}
+
+// Verifies isPrintable predicate on strings.
+TEST_F(StringUtilTest, stringIsPrintable) {
+    string content;
+
+    // Empty is printable.
+    EXPECT_TRUE(isPrintable(content));
+
+    // Check Abcd.
+    content = "Abcd";
+    EXPECT_TRUE(isPrintable(content));
+
+    // Add a control character (not printable).
+    content += "\a";
+    EXPECT_FALSE(isPrintable(content));
+}
+
+// Verifies isPrintable predicate on byte vectors.
+TEST_F(StringUtilTest, vectorIsPrintable) {
+    vector<uint8_t> content;
+
+    // Empty is printable.
+    EXPECT_TRUE(isPrintable(content));
+
+    // Check Abcd.
+    content = {0x41, 0x62, 0x63, 0x64};
+    EXPECT_TRUE(isPrintable(content));
+
+    // Add a control character (not printable).
+    content.push_back('\a');
+    EXPECT_FALSE(isPrintable(content));
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/thread_pool_unittest.cc b/src/lib/util/tests/thread_pool_unittest.cc
new file mode 100644
index 0000000..976960a
--- /dev/null
+++ b/src/lib/util/tests/thread_pool_unittest.cc
@@ -0,0 +1,804 @@
+// Copyright (C) 2018-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <exceptions/exceptions.h>
+#include <util/thread_pool.h>
+
+#include <signal.h>
+
+using namespace isc;
+using namespace isc::util;
+using namespace std;
+
+namespace {
+
+/// @brief define CallBack type
+typedef function<void()> CallBack;
+
+/// @brief Test Fixture for testing isc::dhcp::ThreadPool
+class ThreadPoolTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    ThreadPoolTest() : thread_count_(0), count_(0), wait_(false) {
+    }
+
+    /// @brief task function which registers the thread id and signals main
+    /// thread to stop waiting and then waits for main thread to signal to exit
+    void runAndWait() {
+        // run task
+        run();
+        // wait for main thread signal to exit
+        unique_lock<mutex> lk(wait_mutex_);
+        wait_cv_.wait(lk, [&]() {return (wait() == false);});
+    }
+
+    /// @brief task function which registers the thread id and signals main
+    /// thread to stop waiting
+    void run() {
+        {
+            // make sure this thread has started and it is accounted for
+            lock_guard<mutex> lk(mutex_);
+            auto id = this_thread::get_id();
+            // register this thread as doing work on items
+            ids_.emplace(id);
+            // finish task
+            ++count_;
+            // register this task on the history of this thread
+            history_[id].push_back(count_);
+        }
+        // wake main thread if it is waiting for this thread to process
+        cv_.notify_all();
+    }
+
+    /// @brief task function which tries to stop the thread pool and then calls
+    /// @ref runAndWait
+    ///
+    /// @param thread_pool the thread pool
+    void runStopResetAndWait(ThreadPool<CallBack>* thread_pool) {
+        EXPECT_THROW(thread_pool->stop(), MultiThreadingInvalidOperation);
+        EXPECT_THROW(thread_pool->reset(), MultiThreadingInvalidOperation);
+        EXPECT_THROW(thread_pool->wait(), MultiThreadingInvalidOperation);
+        EXPECT_THROW(thread_pool->wait(0), MultiThreadingInvalidOperation);
+        sigset_t nsset;
+        pthread_sigmask(SIG_SETMASK, 0, &nsset);
+        EXPECT_EQ(1, sigismember(&nsset, SIGCHLD));
+        EXPECT_EQ(1, sigismember(&nsset, SIGINT));
+        EXPECT_EQ(1, sigismember(&nsset, SIGHUP));
+        EXPECT_EQ(1, sigismember(&nsset, SIGTERM));
+        EXPECT_NO_THROW(runAndWait());
+    }
+
+    /// @brief reset all counters and internal test state
+    ///
+    /// @param thread_count number of threads
+    void reset(uint32_t thread_count) {
+        // stop test threads
+        stopThreads();
+        // reset the internal state of the test
+        thread_count_ = thread_count;
+        count_ = 0;
+        wait_ = true;
+        ids_.clear();
+        history_.clear();
+    }
+
+    /// @brief start test threads and block main thread until all tasks have
+    /// been processed
+    ///
+    /// @param thread_count number of threads to be started
+    /// @param items_count number of items to wait for being processed
+    /// @param start create processing threads
+    /// @param signal give main thread control over the threads exit
+    void waitTasks(uint32_t thread_count, uint32_t items_count,
+                   bool start = false, bool signal = true) {
+        // make sure we have all threads running when performing all the checks
+        unique_lock<mutex> lck(mutex_);
+        if (start) {
+            // start test threads if explicitly specified
+            startThreads(thread_count, signal);
+        }
+        // wait for the threads to process all the items
+        cv_.wait(lck, [&]() {return (count() == items_count);});
+    }
+
+    /// @brief start test threads
+    ///
+    /// @param thread_count number of threads to be started
+    /// @param signal give main thread control over the threads exit
+    void startThreads(uint32_t thread_count, bool signal = true) {
+        // set default task function to wait for main thread signal
+        auto runFunction = &ThreadPoolTest::runAndWait;
+        if (!signal) {
+            // set the task function to finish immediately
+            runFunction = &ThreadPoolTest::run;
+        }
+        // start test threads
+        for (uint32_t i = 0; i < thread_count; ++i) {
+            threads_.push_back(boost::make_shared<std::thread>(runFunction, this));
+        }
+    }
+
+    /// @brief stop test threads
+    void stopThreads() {
+        // signal threads that are waiting
+        signalThreads();
+        // wait for all test threads to exit
+        for (auto const& thread : threads_) {
+            thread->join();
+        }
+        // reset all threads
+        threads_.clear();
+    }
+
+    /// @brief function used by main thread to unblock processing threads
+    void signalThreads() {
+        {
+            lock_guard<mutex> lk(wait_mutex_);
+            // clear the wait flag so that threads will no longer wait for the main
+            // thread signal
+            wait_ = false;
+        }
+        // wake all threads if waiting for main thread signal
+        wait_cv_.notify_all();
+    }
+
+    /// @brief number of completed tasks
+    ///
+    /// @return the number of completed tasks
+    uint32_t count() {
+        return (count_);
+    }
+
+    /// @brief flag which indicates if working thread should wait for main
+    /// thread signal
+    ///
+    /// @return the wait flag
+    bool wait() {
+        return (wait_);
+    }
+
+    /// @brief check the total number of tasks that have been processed
+    /// Some of the tasks may have been run on the same thread and none may have
+    /// been processed by other threads
+    ///
+    /// @param items_count the number of tasks
+    void checkRunHistory(uint32_t items_count) {
+        uint32_t count = 0;
+        // iterate over all threads history and count all the processed tasks
+        for (auto const& element : history_) {
+            count += element.second.size();
+        }
+        ASSERT_EQ(count, items_count);
+    }
+
+    /// @brief check the total number of threads that have processed tasks
+    ///
+    /// @param number of threads processing tasks
+    void checkIds(uint32_t count) {
+        ASSERT_EQ(ids_.size(), count);
+    }
+
+    /// @brief check the thread pool state
+    ///
+    /// @param thread_pool the thread pool
+    /// @param count the number of tasks
+    /// @param size the thread pool size
+    void checkState(ThreadPool<CallBack>& thread_pool, uint32_t count, uint32_t size) {
+        // the item count should match
+        ASSERT_EQ(thread_pool.count(), count);
+        // the thread count should match
+        ASSERT_EQ(thread_pool.size(), size);
+    }
+
+private:
+    /// @brief thread count used by the test
+    uint32_t thread_count_;
+
+    /// @brief mutex used to keep the internal state consistent
+    std::mutex mutex_;
+
+    /// @brief condition variable used to signal main thread that all threads
+    /// have started processing
+    condition_variable cv_;
+
+    /// @brief mutex used to keep the internal state consistent
+    /// related to the control of the main thread over the working threads exit
+    std::mutex wait_mutex_;
+
+    /// @brief condition variable used to signal working threads to exit
+    condition_variable wait_cv_;
+
+    /// @brief number of completed tasks
+    uint32_t count_;
+
+    /// @brief flag which indicates if working thread should wait for main
+    /// thread signal
+    bool wait_;
+
+    /// @brief the set of thread ids which have completed tasks
+    set<std::thread::id> ids_;
+
+    /// @brief the list of completed tasks run by each thread
+    map<std::thread::id, list<uint32_t>> history_;
+
+    /// @brief the list of test threads
+    list<boost::shared_ptr<std::thread>> threads_;
+};
+
+/// @brief test ThreadPool add and count
+TEST_F(ThreadPoolTest, addAndCount) {
+    uint32_t items_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    checkState(thread_pool, 0, 0);
+
+    items_count = 4;
+
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    // the item count should match
+    ASSERT_EQ(thread_pool.count(), items_count);
+
+    // calling reset should clear all threads and should remove all queued items
+    EXPECT_NO_THROW(thread_pool.reset());
+    checkState(thread_pool, 0, 0);
+}
+
+/// @brief test ThreadPool start and stop
+TEST_F(ThreadPoolTest, startAndStop) {
+    uint32_t items_count;
+    uint32_t thread_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    checkState(thread_pool, 0, 0);
+
+    items_count = 4;
+    thread_count = 4;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which block thread pool threads until signaled by main
+    // thread to force all threads of the thread pool to run exactly one task
+    call_back = std::bind(&ThreadPoolTest::runAndWait, this);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_THROW(thread_pool.start(0), InvalidParameter);
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    checkState(thread_pool, 0, thread_count);
+
+    // do it once again to check if it works
+    EXPECT_THROW(thread_pool.start(thread_count), InvalidOperation);
+    checkState(thread_pool, 0, thread_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    // do it once again to check if it works
+    EXPECT_THROW(thread_pool.stop(), InvalidOperation);
+    checkState(thread_pool, 0, 0);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_THROW(thread_pool.stop(), InvalidOperation);
+    checkState(thread_pool, items_count, 0);
+
+    // calling reset should clear all threads and should remove all queued items
+    EXPECT_NO_THROW(thread_pool.reset());
+    checkState(thread_pool, 0, 0);
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.reset());
+    checkState(thread_pool, 0, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    checkState(thread_pool, 0, thread_count);
+
+    // add items to running thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // as each thread pool thread is still waiting on main to unblock, each
+    // thread should have been registered in ids list
+    checkIds(items_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // signal thread pool tasks to continue
+    signalThreads();
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 64;
+    thread_count = 16;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which do not block the thread pool threads so that several
+    // tasks can be run on the same thread and some of the threads never even
+    // having a chance to run
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 16;
+    thread_count = 16;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which try to stop the thread pool and then block thread pool
+    // threads until signaled by main thread to force all threads of the thread
+    // pool to run exactly one task
+    call_back = std::bind(&ThreadPoolTest::runStopResetAndWait, this, &thread_pool);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    checkState(thread_pool, 0, thread_count);
+
+    // add items to running thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // as each thread pool thread is still waiting on main to unblock, each
+    // thread should have been registered in ids list
+    checkIds(items_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // signal thread pool tasks to continue
+    signalThreads();
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    /// statistics
+    std::cout << "stat10: " << thread_pool.getQueueStat(10) << std::endl;
+    std::cout << "stat100: " << thread_pool.getQueueStat(100) << std::endl;
+    std::cout << "stat1000: " << thread_pool.getQueueStat(1000) << std::endl;
+}
+
+/// @brief test ThreadPool wait
+TEST_F(ThreadPoolTest, wait) {
+    uint32_t items_count;
+    uint32_t thread_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    checkState(thread_pool, 0, 0);
+
+    // calling wait should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.wait());
+    checkState(thread_pool, 0, 0);
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.wait());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 16;
+    thread_count = 16;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which block thread pool threads until signaled by main
+    // thread to force all threads of the thread pool to run exactly one task
+    call_back = std::bind(&ThreadPoolTest::runAndWait, this);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // as each thread pool thread is still waiting on main to unblock, each
+    // thread should have been registered in ids list
+    checkIds(items_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // check that waiting on tasks does timeout
+    ASSERT_FALSE(thread_pool.wait(1));
+
+    // signal thread pool tasks to continue
+    signalThreads();
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 64;
+    thread_count = 16;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which do not block the thread pool threads so that several
+    // tasks can be run on the same thread and some of the threads never even
+    // having a chance to run
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    thread_pool.wait();
+    checkState(thread_pool, 0, thread_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 16;
+    thread_count = 256;
+    // prepare setup
+    reset(thread_count);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    // wait for all items to be processed
+    ASSERT_TRUE(thread_pool.wait(1));
+    checkState(thread_pool, 0, 0);
+}
+
+/// @brief test ThreadPool pause and resume
+TEST_F(ThreadPoolTest, pauseAndResume) {
+    uint32_t items_count;
+    uint32_t thread_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    checkState(thread_pool, 0, 0);
+
+    items_count = 4;
+    thread_count = 4;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which block thread pool threads until signaled by main
+    // thread to force all threads of the thread pool to run exactly one task
+    call_back = std::bind(&ThreadPoolTest::runAndWait, this);
+
+    // calling resume should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.resume());
+    checkState(thread_pool, 0, 0);
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.resume());
+    checkState(thread_pool, 0, 0);
+
+    // calling pause should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, 0, 0);
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, 0, 0);
+
+    // calling resume should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.resume());
+    checkState(thread_pool, 0, 0);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling pause should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, items_count, 0);
+
+    // calling resume should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.resume());
+    checkState(thread_pool, items_count, 0);
+
+    // calling pause should do nothing if not started
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    checkState(thread_pool, items_count, thread_count);
+
+    // calling resume should resume threads
+    EXPECT_NO_THROW(thread_pool.resume());
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // as each thread pool thread is still waiting on main to unblock, each
+    // thread should have been registered in ids list
+    checkIds(items_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // signal thread pool tasks to continue
+    signalThreads();
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.resume());
+    checkState(thread_pool, 0, thread_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+
+    items_count = 64;
+    thread_count = 16;
+    // prepare setup
+    reset(thread_count);
+
+    // create tasks which do not block the thread pool threads so that several
+    // tasks can be run on the same thread and some of the threads never even
+    // having a chance to run
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, 0);
+
+    // calling start should create the threads and should keep the queued items
+    EXPECT_NO_THROW(thread_pool.start(thread_count));
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // calling pause should pause threads
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, 0, thread_count);
+
+    // do it once again to check if it works
+    EXPECT_NO_THROW(thread_pool.pause());
+    checkState(thread_pool, 0, thread_count);
+
+    // prepare setup
+    reset(thread_count);
+
+    // add items to paused thread pool
+    for (uint32_t i = 0; i < items_count; ++i) {
+        bool ret = true;
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    checkState(thread_pool, items_count, thread_count);
+
+    // calling resume should resume threads
+    EXPECT_NO_THROW(thread_pool.resume());
+    // the thread count should match
+    ASSERT_EQ(thread_pool.size(), thread_count);
+
+    // wait for all items to be processed
+    waitTasks(thread_count, items_count);
+    checkState(thread_pool, 0, thread_count);
+    // all items should have been processed
+    ASSERT_EQ(count(), items_count);
+
+    // check that the number of processed tasks matches the number of items
+    checkRunHistory(items_count);
+
+    // calling stop should clear all threads and should keep queued items
+    EXPECT_NO_THROW(thread_pool.stop());
+    checkState(thread_pool, 0, 0);
+}
+
+/// @brief test ThreadPool max queue size
+TEST_F(ThreadPoolTest, maxQueueSize) {
+    uint32_t items_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    // the item count should be 0
+    ASSERT_EQ(thread_pool.count(), 0);
+    // the thread count should be 0
+    ASSERT_EQ(thread_pool.size(), 0);
+
+    items_count = 20;
+
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    bool ret = true;
+    for (uint32_t i = 0; i < items_count; ++i) {
+        EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    // the item count should match
+    ASSERT_EQ(thread_pool.count(), items_count);
+
+    // change the max count
+    ASSERT_EQ(thread_pool.getMaxQueueSize(), 0);
+    size_t max_queue_size = 10;
+    thread_pool.setMaxQueueSize(max_queue_size);
+    EXPECT_EQ(thread_pool.getMaxQueueSize(), max_queue_size);
+
+    // adding an item should squeeze the queue
+    EXPECT_EQ(thread_pool.count(), items_count);
+    EXPECT_NO_THROW(ret = thread_pool.add(boost::make_shared<CallBack>(call_back)));
+    EXPECT_FALSE(ret);
+    EXPECT_EQ(thread_pool.count(), max_queue_size);
+}
+
+/// @brief test ThreadPool add front.
+TEST_F(ThreadPoolTest, addFront) {
+    uint32_t items_count;
+    CallBack call_back;
+    ThreadPool<CallBack> thread_pool;
+    // the item count should be 0
+    ASSERT_EQ(thread_pool.count(), 0);
+    // the thread count should be 0
+    ASSERT_EQ(thread_pool.size(), 0);
+
+    items_count = 20;
+
+    call_back = std::bind(&ThreadPoolTest::run, this);
+
+    // add items to stopped thread pool
+    bool ret = true;
+    for (uint32_t i = 0; i < items_count; ++i) {
+        EXPECT_NO_THROW(ret = thread_pool.addFront(boost::make_shared<CallBack>(call_back)));
+        EXPECT_TRUE(ret);
+    }
+
+    // the item count should match
+    ASSERT_EQ(thread_pool.count(), items_count);
+
+    // change the max count
+    ASSERT_EQ(thread_pool.getMaxQueueSize(), 0);
+    size_t max_queue_size = 10;
+    thread_pool.setMaxQueueSize(max_queue_size);
+    EXPECT_EQ(thread_pool.getMaxQueueSize(), max_queue_size);
+
+    // adding an item at front should change nothing queue
+    EXPECT_EQ(thread_pool.count(), items_count);
+    EXPECT_NO_THROW(ret = thread_pool.addFront(boost::make_shared<CallBack>(call_back)));
+    EXPECT_FALSE(ret);
+    EXPECT_EQ(thread_pool.count(), items_count);
+}
+
+/// @brief test ThreadPool get queue statistics.
+TEST_F(ThreadPoolTest, getQueueStat) {
+    ThreadPool<CallBack> thread_pool;
+    EXPECT_THROW(thread_pool.getQueueStat(0), InvalidParameter);
+    EXPECT_THROW(thread_pool.getQueueStat(1), InvalidParameter);
+    EXPECT_THROW(thread_pool.getQueueStat(-10), InvalidParameter);
+    EXPECT_THROW(thread_pool.getQueueStat(10000), InvalidParameter);
+    EXPECT_NO_THROW(thread_pool.getQueueStat(10));
+    EXPECT_NO_THROW(thread_pool.getQueueStat(100));
+    EXPECT_NO_THROW(thread_pool.getQueueStat(1000));
+}
+
+}  // namespace
diff --git a/src/lib/util/tests/triplet_unittest.cc b/src/lib/util/tests/triplet_unittest.cc
new file mode 100644
index 0000000..9736011
--- /dev/null
+++ b/src/lib/util/tests/triplet_unittest.cc
@@ -0,0 +1,125 @@
+// Copyright (C) 2012-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/triplet.h>
+#include <exceptions/exceptions.h>
+
+#include <gtest/gtest.h>
+
+#include <stdint.h>
+
+using namespace isc::util;
+using namespace isc;
+
+namespace {
+
+// constructor validation
+TEST(TripletTest, constructor) {
+
+    const uint32_t min = 10;
+    const uint32_t value = 20;
+    const uint32_t max = 30;
+
+    Triplet<uint32_t> x(min, value, max);
+
+    EXPECT_EQ(min, x.getMin());
+    EXPECT_EQ(value, x.get());
+    EXPECT_EQ(max, x.getMax());
+    EXPECT_FALSE(x.unspecified());
+
+    // requested values below min should return allowed min value
+    EXPECT_EQ(min, x.get(min - 5));
+
+    EXPECT_EQ(min, x.get(min));
+
+    // requesting a value from within the range (min < x < max) should
+    // return the requested value
+    EXPECT_EQ(17, x.get(17));
+
+    EXPECT_EQ(max, x.get(max));
+
+    EXPECT_EQ(max, x.get(max + 5));
+
+    // this will be boring. It is expected to return 42 no matter what
+    Triplet<uint32_t> y(42);
+
+    EXPECT_EQ(42, y.getMin()); // min, default and max are equal to 42
+    EXPECT_EQ(42, y.get());    // it returns ...
+    EXPECT_EQ(42, y.getMax()); // the exact value...
+    EXPECT_FALSE(x.unspecified());
+
+    // requested values below or above are ignore
+    EXPECT_EQ(42, y.get(5));   // all...
+    EXPECT_EQ(42, y.get(42));  // the...
+    EXPECT_EQ(42, y.get(80));  // time!
+}
+
+TEST(TripletTest, unspecified) {
+    Triplet<uint32_t> x;
+    // When using the constructor without parameters, the triplet
+    // value is unspecified.
+    EXPECT_EQ(0, x.getMin());
+    EXPECT_EQ(0, x.get());
+    EXPECT_EQ(0, x.getMax());
+    EXPECT_TRUE(x.unspecified());
+
+    // For the triplet which has unspecified value we can call accessors
+    // without an exception.
+    uint32_t exp_unspec = 0;
+    EXPECT_EQ(exp_unspec, x);
+
+    x = 72;
+    // Check if the new value has been assigned.
+    EXPECT_EQ(72, x.getMin());
+    EXPECT_EQ(72, x.get());
+    EXPECT_EQ(72, x.getMax());
+    // Triplet is now specified.
+    EXPECT_FALSE(x.unspecified());
+}
+
+// Triplets must be easy to use.
+// Simple to/from int conversions must be done on the fly.
+TEST(TripletTest, operator) {
+
+    uint32_t x = 47;
+
+    Triplet<uint32_t> foo(1,2,3);
+    Triplet<uint32_t> bar(4,5,6);
+
+    foo = bar;
+
+    EXPECT_EQ(4, foo.getMin());
+    EXPECT_EQ(5, foo.get());
+    EXPECT_EQ(6, foo.getMax());
+    EXPECT_FALSE(foo.unspecified());
+
+    // assignment operator: uint32_t => triplet
+    Triplet<uint32_t> y(0);
+    y = x;
+
+    EXPECT_EQ(x, y.get());
+
+    // let's try the other way around: triplet => uint32_t
+    uint32_t z = 0;
+    z = y;
+
+    EXPECT_EQ(x, z);
+}
+
+// check if specified values are sane
+TEST(TripletTest, sanityCheck) {
+
+    // min is larger than default
+    EXPECT_THROW(Triplet<uint32_t>(6,5,5), BadValue);
+
+    // max is smaller than default
+    EXPECT_THROW(Triplet<uint32_t>(5,5,4), BadValue);
+
+}
+
+}; // end of anonymous namespace
diff --git a/src/lib/util/tests/unlock_guard_unittests.cc b/src/lib/util/tests/unlock_guard_unittests.cc
new file mode 100644
index 0000000..baaf0e7
--- /dev/null
+++ b/src/lib/util/tests/unlock_guard_unittests.cc
@@ -0,0 +1,236 @@
+// Copyright (C) 2020-2024 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <util/unlock_guard.h>
+#include <exceptions/exceptions.h>
+
+#include <mutex>
+#include <thread>
+
+using namespace isc::util;
+using namespace std;
+
+namespace {
+
+/// @brief test mutex class used to check the internal state of a 'fictional'
+/// mutex so that the functionality of the UnlockGuard can be tested
+/// @note the test mutex can be recursive which means that a lock can be called
+/// on the same thread and not resulting in a dead lock
+class TestMutex {
+public:
+    /// @brief Constructor
+    ///
+    /// @param recursive sets the mutex as recursive mutex
+    TestMutex(bool recursive = false) : lock_(0), dead_lock_(false),
+        lock_count_(0), unlock_count_(0), recursive_(recursive) {
+    }
+
+    /// @brief lock the mutex
+    void lock() {
+        lock_guard<mutex> lk(mutex_);
+        if (lock_ >= 1) {
+            // mutex is already locked
+            if (!recursive_) {
+                // lock on a non-recursive mutex resulting in a dead lock
+                dead_lock_ = true;
+                isc_throw(isc::InvalidOperation,
+                          "recursive lock on already locked mutex resulting in "
+                          "dead lock");
+            } else {
+                // lock on a recursive mutex
+                if (this_thread::get_id() != id_) {
+                    // lock on a recursive mutex on a different thread resulting
+                    // in a dead lock
+                    dead_lock_ = true;
+                    isc_throw(isc::InvalidOperation,
+                              "recursive lock on a different thread on already "
+                              "locked mutex resulting in dead lock");
+                }
+            }
+        }
+        // increment the total number of locks
+        lock_count_++;
+        // increment the lock state
+        lock_++;
+        // save the thread id
+        id_ = this_thread::get_id();
+    }
+
+    /// @brief unlock the mutex
+    void unlock() {
+        lock_guard<mutex> lk(mutex_);
+        if (lock_ <= 0) {
+            // unlock an unlocked mutex
+            isc_throw(isc::InvalidOperation, "unlock on non locked mutex "
+                      "resulting in undefined behavior");
+        }
+        if (lock_ == 1) {
+            // only one thread has the lock
+            // self healing mutex resetting the dead lock flag
+            dead_lock_ = false;
+            // reset the thread id
+            id_ = std::thread::id();
+        }
+        // increment the total number of unlocks
+        unlock_count_++;
+        // decrement the lock state
+        lock_--;
+    }
+
+    /// @brief get the mutex lock state
+    ///
+    /// @return the mutex lock state
+    int32_t getLock() {
+        lock_guard<mutex> lk(mutex_);
+        return lock_;
+    }
+
+    /// @brief get the mutex dead lock state
+    ///
+    /// @return the mutex dead lock state
+    bool getDeadLock() {
+        lock_guard<mutex> lk(mutex_);
+        return dead_lock_;
+    }
+
+    /// @brief get the number of locks performed on mutex
+    ///
+    /// @return the mutex number of locks
+    uint32_t getLockCount() {
+        lock_guard<mutex> lk(mutex_);
+        return lock_count_;
+    }
+
+    /// @brief get the number of unlocks performed on mutex
+    ///
+    /// @return the mutex number of unlocks
+    uint32_t getUnlockCount() {
+        lock_guard<mutex> lk(mutex_);
+        return unlock_count_;
+    }
+
+    /// @brief test the internal state of the mutex
+    ///
+    /// @param expected_lock check equality of this value with lock state
+    /// @param expected_lock_count check equality of this value with lock count
+    /// @param expected_unlock_count check equality of this value with unlock count
+    /// @param expected_dead_lock check equality of this value with dead lock state
+    void testMutexState(int32_t expected_lock,
+                        uint32_t expected_lock_count,
+                        uint32_t expected_unlock_count,
+                        bool expected_dead_lock) {
+        ASSERT_EQ(getLock(), expected_lock);
+        ASSERT_EQ(getLockCount(), expected_lock_count);
+        ASSERT_EQ(getUnlockCount(), expected_unlock_count);
+        ASSERT_EQ(getDeadLock(), expected_dead_lock);
+    }
+
+private:
+    /// @brief internal lock state of the mutex
+    int32_t lock_;
+
+    /// @brief state which indicates that the mutex is in dead lock
+    bool dead_lock_;
+
+    /// @brief total number of locks performed on the mutex
+    uint32_t lock_count_;
+
+    /// @brief total number of unlocks performed on the mutex
+    uint32_t unlock_count_;
+
+    /// @brief flag to indicate if the mutex is recursive or not
+    bool recursive_;
+
+    /// @brief mutex used to keep the internal state consistent
+    mutex mutex_;
+
+    /// @brief the id of the thread holding the mutex
+    std::thread::id id_;
+};
+
+/// @brief Test Fixture for testing isc::util::UnlockGuard
+class UnlockGuardTest : public ::testing::Test {
+};
+
+/// @brief test TestMutex functionality with non-recursive mutex, and recursive
+/// mutex
+TEST_F(UnlockGuardTest, testMutex) {
+    shared_ptr<TestMutex> test_mutex;
+    // test non-recursive lock
+    test_mutex = make_shared<TestMutex>();
+    test_mutex->testMutexState(0, 0, 0, false);
+    {
+        // call lock_guard constructor which locks mutex
+        lock_guard<TestMutex> lock(*test_mutex.get());
+        // expect lock 1 lock_count 1 unlock_count 0 dead_lock false
+        test_mutex->testMutexState(1, 1, 0, false);
+        {
+            // call lock_guard constructor which locks mutex resulting in an
+            // exception as the mutex is already locked (dead lock)
+            EXPECT_THROW(lock_guard<TestMutex> lock2(*test_mutex.get()),
+                         isc::InvalidOperation);
+            // expect lock 1 lock_count 1 unlock_count 0 dead_lock true
+            // you should not be able to get here...using a real mutex
+            test_mutex->testMutexState(1, 1, 0, true);
+        }
+        // expect lock 1 lock_count 1 unlock_count 0 dead_lock true
+        // you should not be able to get here...using a real mutex
+        test_mutex->testMutexState(1, 1, 0, true);
+    }
+    // expect lock 0 lock_count 1 unlock_count 1 dead_lock false
+    // the implementation is self healing when completely unlocking the mutex
+    test_mutex->testMutexState(0, 1, 1, false);
+    // test recursive lock
+    test_mutex = make_shared<TestMutex>(true);
+    test_mutex->testMutexState(0, 0, 0, false);
+    {
+        // call lock_guard constructor which locks mutex
+        lock_guard<TestMutex> lock(*test_mutex.get());
+        // expect lock 1 lock_count 1 unlock_count 0 dead_lock false
+        test_mutex->testMutexState(1, 1, 0, false);
+        {
+            // call lock_guard constructor which locks mutex but does not block
+            // as this is done on the same thread and the mutex is recursive
+            EXPECT_NO_THROW(lock_guard<TestMutex> lock2(*test_mutex.get()));
+            // expect lock 1 lock_count 2 unlock_count 1 dead_lock false
+            // the destructor was already called in EXPECT_NO_THROW scope
+            test_mutex->testMutexState(1, 2, 1, false);
+        }
+        // expect lock 1 lock_count 2 unlock_count 1 dead_lock false
+        test_mutex->testMutexState(1, 2, 1, false);
+    }
+    // expect lock 0 lock_count 2 unlock_count 2 dead_lock false
+    test_mutex->testMutexState(0, 2, 2, false);
+}
+
+/// @brief test UnlockGuard functionality with non-recursive mutex
+TEST_F(UnlockGuardTest, testUnlockGuard) {
+    shared_ptr<TestMutex> test_mutex;
+    // test non-recursive lock
+    test_mutex = make_shared<TestMutex>();
+    test_mutex->testMutexState(0, 0, 0, false);
+    {
+        // call lock_guard constructor which locks mutex
+        lock_guard<TestMutex> lock(*test_mutex.get());
+        // expect lock 1 lock_count 1 unlock_count 0 dead_lock false
+        test_mutex->testMutexState(1, 1, 0, false);
+        {
+            UnlockGuard<TestMutex> unlock_guard(*test_mutex.get());
+            // expect lock 0 lock_count 1 unlock_count 1 dead_lock false
+            test_mutex->testMutexState(0, 1, 1, false);
+        }
+        // expect lock 1 lock_count 2 unlock_count 1 dead_lock false
+        test_mutex->testMutexState(1, 2, 1, false);
+    }
+    // expect lock 0 lock_count 2 unlock_count 2 dead_lock false
+    test_mutex->testMutexState(0, 2, 2, false);
+}
+
+} // namespace
diff --git a/src/lib/util/tests/utf8_unittest.cc b/src/lib/util/tests/utf8_unittest.cc
new file mode 100644
index 0000000..168f38b
--- /dev/null
+++ b/src/lib/util/tests/utf8_unittest.cc
@@ -0,0 +1,50 @@
+// Copyright (C) 2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/encode/utf8.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc::util;
+using namespace isc::util::encode;
+using namespace std;
+
+namespace {
+
+// Verify it does nothing for ASCII.
+TEST(Utf8Test, foobar) {
+    string str("foobar");
+    vector<uint8_t> vec8 = encodeUtf8(str);
+    ASSERT_FALSE(vec8.empty());
+    const char* start = reinterpret_cast<const char*>(&vec8[0]);
+    string str8(start, start + vec8.size());
+    EXPECT_EQ(str, str8);
+}
+
+// Verify it encodes not ASCII as expected.
+TEST(Utf8Test, eightc) {
+    string str("-\x8c-");
+    vector<uint8_t> vec8 = encodeUtf8(str);
+    ASSERT_FALSE(vec8.empty());
+    const char* start = reinterpret_cast<const char*>(&vec8[0]);
+    string str8(start, start + vec8.size());
+    string expected("-\xc2\x8c-");
+    EXPECT_EQ(expected, str8);
+}
+
+// Verify it handles correctly control characters.
+TEST(Utf8Test, control) {
+    string str("fo\x00\n\bar");
+    vector<uint8_t> vec8 = encodeUtf8(str);
+    ASSERT_FALSE(vec8.empty());
+    const char* start = reinterpret_cast<const char*>(&vec8[0]);
+    string str8(start, start + vec8.size());
+    EXPECT_EQ(str, str8);
+}
+
+}
diff --git a/src/lib/util/tests/versioned_csv_file_unittest.cc b/src/lib/util/tests/versioned_csv_file_unittest.cc
new file mode 100644
index 0000000..36a1f91
--- /dev/null
+++ b/src/lib/util/tests/versioned_csv_file_unittest.cc
@@ -0,0 +1,501 @@
+// Copyright (C) 2015-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <util/versioned_csv_file.h>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+#include <fstream>
+#include <sstream>
+#include <string>
+
+#include <boost/algorithm/string/classification.hpp>
+#include <boost/algorithm/string/constants.hpp>
+#include <boost/algorithm/string/split.hpp>
+
+namespace {
+
+using namespace isc::util;
+
+/// @brief Test fixture class for testing operations on VersionedCSVFile.
+///
+/// It implements basic operations on files, such as reading writing
+/// file removal and checking presence of the file. This is used by
+/// unit tests to verify correctness of the file created by the
+/// CSVFile class.
+class VersionedCSVFileTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Sets the path to the CSV file used throughout the tests.
+    /// The name of the file is test.csv and it is located in the
+    /// current build folder.
+    ///
+    /// It also deletes any dangling files after previous tests.
+    VersionedCSVFileTest();
+
+    /// @brief Destructor.
+    ///
+    /// Deletes the test CSV file if any.
+    virtual ~VersionedCSVFileTest();
+
+    /// @brief Prepends the absolute path to the file specified
+    /// as an argument.
+    ///
+    /// @param filename Name of the file.
+    /// @return Absolute path to the test file.
+    static std::string absolutePath(const std::string& filename);
+
+    /// @brief Check if test file exists on disk.
+    bool exists() const;
+
+    /// @brief Reads whole CSV file.
+    ///
+    /// @return Contents of the file.
+    std::string readFile() const;
+
+    /// @brief Removes existing file (if any).
+    int removeFile() const;
+
+    /// @brief Creates file with contents.
+    ///
+    /// @param contents Contents of the file.
+    void writeFile(const std::string& contents) const;
+
+    /// @brief Absolute path to the file used in the tests.
+    std::string testfile_;
+
+};
+
+VersionedCSVFileTest::VersionedCSVFileTest()
+    : testfile_(absolutePath("test.csv")) {
+    static_cast<void>(removeFile());
+}
+
+VersionedCSVFileTest::~VersionedCSVFileTest() {
+    static_cast<void>(removeFile());
+}
+
+std::string
+VersionedCSVFileTest::absolutePath(const std::string& filename) {
+    std::ostringstream s;
+    s << TEST_DATA_BUILDDIR << "/" << filename;
+    return (s.str());
+}
+
+bool
+VersionedCSVFileTest::exists() const {
+    std::ifstream fs(testfile_.c_str());
+    bool ok = fs.good();
+    fs.close();
+    return (ok);
+}
+
+std::string
+VersionedCSVFileTest::readFile() const {
+    std::ifstream fs(testfile_.c_str());
+    if (!fs.is_open()) {
+        return ("");
+    }
+    std::string contents((std::istreambuf_iterator<char>(fs)),
+                         std::istreambuf_iterator<char>());
+    fs.close();
+    return (contents);
+}
+
+int
+VersionedCSVFileTest::removeFile() const {
+    return (remove(testfile_.c_str()));
+}
+
+void
+VersionedCSVFileTest::writeFile(const std::string& contents) const {
+    std::ofstream fs(testfile_.c_str(), std::ofstream::out);
+    if (fs.is_open()) {
+        fs << contents;
+        fs.close();
+    }
+}
+
+// This test checks that the function which is used to add columns of the
+// CSV file works as expected.
+TEST_F(VersionedCSVFileTest, addColumn) {
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+
+    // Verify that we're not allowed to open it without the schema
+    ASSERT_THROW(csv->open(), VersionedCSVFileError);
+
+    // Add two columns.
+    ASSERT_NO_THROW(csv->addColumn("animal", "1.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "blue"));
+
+    // Make sure we can't add duplicates.
+    EXPECT_THROW(csv->addColumn("animal", "1.0", ""), CSVFileError);
+    EXPECT_THROW(csv->addColumn("color", "2.0", "blue"), CSVFileError);
+
+    // But we should still be able to add unique columns.
+    EXPECT_NO_THROW(csv->addColumn("age", "3.0", "21"));
+
+    // Assert that the file is opened, because the rest of the test relies
+    // on this.
+    ASSERT_NO_THROW(csv->recreate());
+    ASSERT_TRUE(exists());
+
+    // We should have 3 defined columns
+    // Input Header should match defined columns on new files
+    // Valid columns should match defined columns on new files
+    // Minimum valid columns wasn't set. (Remember it's optional)
+    EXPECT_EQ(3, csv->getColumnCount());
+    EXPECT_EQ(3, csv->getInputHeaderCount());
+    EXPECT_EQ(3, csv->getValidColumnCount());
+    EXPECT_EQ(0, csv->getMinimumValidColumns());
+
+    // Schema versions for new files should always match
+    EXPECT_EQ("3.0", csv->getInputSchemaVersion());
+    EXPECT_EQ("3.0", csv->getSchemaVersion());
+
+    // Input Schema State should be current for new files
+    EXPECT_EQ(VersionedCSVFile::CURRENT, csv->getInputSchemaState());
+    EXPECT_FALSE(csv->needsConversion());
+
+    // Make sure we can't add columns (even unique) when the file is open.
+    ASSERT_THROW(csv->addColumn("zoo", "3.0", ""), CSVFileError);
+
+    // Close the file.
+    ASSERT_NO_THROW(csv->close());
+    // And check that now it is possible to add the column.
+    EXPECT_NO_THROW(csv->addColumn("zoo", "3.0", ""));
+}
+
+// Verifies that a current schema version file loads correctly.
+TEST_F(VersionedCSVFileTest, currentSchemaTest) {
+
+    // Create our versioned file, with three columns
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    ASSERT_NO_THROW(csv->addColumn("animal", "2.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "grey"));
+    ASSERT_NO_THROW(csv->addColumn("age", "2.0", "0"));
+
+    // Write a file compliant with the current schema version.
+    writeFile("animal,color,age\n"
+              "cat,black,2\n"
+              "lion,yellow,17\n"
+              "dog,brown,5\n");
+
+    // Header should pass validation and allow the open to succeed.
+    ASSERT_NO_THROW(csv->open());
+
+    // For schema current file We should have:
+    // 3 defined columns
+    // 3 columns total found in the header
+    // 3 valid columns found in the header
+    // Minimum valid columns wasn't set. (Remember it's optional)
+    EXPECT_EQ(3, csv->getColumnCount());
+    EXPECT_EQ(3, csv->getInputHeaderCount());
+    EXPECT_EQ(3, csv->getValidColumnCount());
+    EXPECT_EQ(0, csv->getMinimumValidColumns());
+
+    // Input schema and current schema should both be  2.0
+    EXPECT_EQ("2.0", csv->getInputSchemaVersion());
+    EXPECT_EQ("2.0", csv->getSchemaVersion());
+
+    // Input Schema State should be CURRENT
+    EXPECT_EQ(VersionedCSVFile::CURRENT, csv->getInputSchemaState());
+    EXPECT_FALSE(csv->needsConversion());
+
+    // First row is correct.
+    CSVRow row;
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("black", row.readAt(1));
+    EXPECT_EQ("2", row.readAt(2));
+
+    // Second row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("yellow", row.readAt(1));
+    EXPECT_EQ("17", row.readAt(2));
+
+    // Third row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("dog", row.readAt(0));
+    EXPECT_EQ("brown", row.readAt(1));
+    EXPECT_EQ("5", row.readAt(2));
+}
+
+
+// Verifies the basic ability to upgrade valid files.
+// It starts with a version 1.0 file and updates
+// it through two schema evolutions.
+TEST_F(VersionedCSVFileTest, upgradeOlderVersions) {
+
+    // Create version 1.0 schema  CSV file
+    writeFile("animal\n"
+              "cat\n"
+              "lion\n"
+              "dog\n");
+
+    // Create our versioned file, with two columns, one for each
+    // schema version
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    ASSERT_NO_THROW(csv->addColumn("animal", "1.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "blue"));
+
+    // Header should pass validation and allow the open to succeed.
+    ASSERT_NO_THROW(csv->open());
+
+    // We should have:
+    // 2 defined columns
+    // 1 column found in the header
+    // 1 valid column in the header
+    // Minimum valid columns wasn't set. (Remember it's optional)
+    EXPECT_EQ(2, csv->getColumnCount());
+    EXPECT_EQ(1, csv->getInputHeaderCount());
+    EXPECT_EQ(1, csv->getValidColumnCount());
+    EXPECT_EQ(0, csv->getMinimumValidColumns());
+
+    // Input schema should be 1.0, while our current schema should be 2.0
+    EXPECT_EQ("1.0", csv->getInputSchemaVersion());
+    EXPECT_EQ("2.0", csv->getSchemaVersion());
+
+    // Input Schema State should be NEEDS_UPGRADE
+    EXPECT_EQ(VersionedCSVFile::NEEDS_UPGRADE, csv->getInputSchemaState());
+    EXPECT_TRUE(csv->needsConversion());
+
+    // First row is correct.
+    CSVRow row;
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+
+    // Second row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+
+    // Third row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("dog", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+
+    // Now, let's try to append something to this file.
+    CSVRow row_write(2);
+    row_write.writeAt(0, "bird");
+    row_write.writeAt(1, "yellow");
+    ASSERT_NO_THROW(csv->append(row_write));
+
+    // Close the file
+    ASSERT_NO_THROW(csv->flush());
+    ASSERT_NO_THROW(csv->close());
+
+
+    // Check the file contents are correct.
+    EXPECT_EQ("animal\n"
+              "cat\n"
+              "lion\n"
+              "dog\n"
+              "bird,yellow\n",
+              readFile());
+
+    // Create a third schema by adding a column
+    ASSERT_NO_THROW(csv->addColumn("age", "3.0", "21"));
+    ASSERT_EQ(3, csv->getColumnCount());
+
+    // Header should pass validation and allow the open to succeed
+    ASSERT_NO_THROW(csv->open());
+
+    // We should have:
+    // 3 defined columns
+    // 1 column found in the header
+    // 1 valid column in the header
+    // Minimum valid columns wasn't set. (Remember it's optional)
+    EXPECT_EQ(3, csv->getColumnCount());
+    EXPECT_EQ(1, csv->getInputHeaderCount());
+    EXPECT_EQ(1, csv->getValidColumnCount());
+    EXPECT_EQ(0, csv->getMinimumValidColumns());
+
+    // Make sure schema versions are accurate
+    EXPECT_EQ("1.0", csv->getInputSchemaVersion());
+    EXPECT_EQ("3.0", csv->getSchemaVersion());
+
+    // Input Schema State should be NEEDS_UPGRADE
+    EXPECT_EQ(VersionedCSVFile::NEEDS_UPGRADE, csv->getInputSchemaState());
+    EXPECT_TRUE(csv->needsConversion());
+
+    // First row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+
+    // Second row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+
+    // Third row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("dog", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+
+    // Fourth row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("bird", row.readAt(0));
+    EXPECT_EQ("yellow", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+}
+
+TEST_F(VersionedCSVFileTest, minimumValidColumn) {
+    // Create version 1.0 schema  CSV file
+    writeFile("animal\n"
+              "cat\n"
+              "lion\n"
+              "dog\n");
+
+    // Create our versioned file, with three columns, one for each
+    // schema version
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    ASSERT_NO_THROW(csv->addColumn("animal", "1.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "blue"));
+    ASSERT_NO_THROW(csv->addColumn("age", "3.0", "21"));
+
+    // Verify we can't set minimum columns with a non-existent column
+    EXPECT_THROW(csv->setMinimumValidColumns("bogus"), VersionedCSVFileError);
+
+    // Set the minimum number of columns to "color"
+    csv->setMinimumValidColumns("color");
+    EXPECT_EQ(2, csv->getMinimumValidColumns());
+
+    // Header validation should fail, too few columns
+    ASSERT_THROW(csv->open(), CSVFileError);
+
+    // Set the minimum number of columns to 1.  File should parse now.
+    csv->setMinimumValidColumns("animal");
+    EXPECT_EQ(1, csv->getMinimumValidColumns());
+    ASSERT_NO_THROW(csv->open());
+
+    // First row is correct.
+    CSVRow row;
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("dog", row.readAt(0));
+    EXPECT_EQ("blue", row.readAt(1));
+    EXPECT_EQ("21", row.readAt(2));
+}
+
+TEST_F(VersionedCSVFileTest, invalidHeaderColumn) {
+
+    // Create our version 2.0 schema file
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    ASSERT_NO_THROW(csv->addColumn("animal", "1.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "blue"));
+
+    // Create a file with the correct number of columns but a wrong column name
+    writeFile("animal,colour\n"
+              "cat,red\n"
+              "lion,green\n");
+
+    // Header validation should fail, we have an invalid column
+    ASSERT_THROW(csv->open(), CSVFileError);
+}
+
+TEST_F(VersionedCSVFileTest, downGrading) {
+    // Create our version 2.0 schema file
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    ASSERT_NO_THROW(csv->addColumn("animal", "1.0", ""));
+    ASSERT_NO_THROW(csv->addColumn("color", "2.0", "blue"));
+
+    // Create schema 2.0 file PLUS an extra column
+    writeFile("animal,color,age\n"
+              "cat,red,5\n"
+              "lion,green,8\n");
+
+    // Header should validate and file should open.
+    ASSERT_NO_THROW(csv->open());
+
+    // We should have:
+    // 2 defined columns
+    // 3 columns found in the header
+    // 2 valid columns in the header
+    // Minimum valid columns wasn't set. (Remember it's optional)
+    EXPECT_EQ(2, csv->getColumnCount());
+    EXPECT_EQ(3, csv->getInputHeaderCount());
+    EXPECT_EQ(2, csv->getValidColumnCount());
+    EXPECT_EQ(0, csv->getMinimumValidColumns());
+
+    // Input schema and current schema should both be 2.0
+    EXPECT_EQ("2.0", csv->getInputSchemaVersion());
+    EXPECT_EQ("2.0", csv->getSchemaVersion());
+
+    // Input Schema State should be NEEDS_DOWNGRADE
+    EXPECT_EQ(VersionedCSVFile::NEEDS_DOWNGRADE, csv->getInputSchemaState());
+    EXPECT_TRUE(csv->needsConversion());
+
+    // First row is correct.
+    CSVRow row;
+    EXPECT_TRUE(csv->next(row));
+    EXPECT_EQ("cat", row.readAt(0));
+    EXPECT_EQ("red", row.readAt(1));
+
+    // No data beyond the second column
+    EXPECT_THROW(row.readAt(2), CSVFileError);
+
+    // Second row is correct.
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("green", row.readAt(1));
+
+    // No data beyond the second column
+    EXPECT_THROW(row.readAt(2), CSVFileError);
+}
+
+
+TEST_F(VersionedCSVFileTest, rowChecking) {
+    // Create version 2.0 schema CSV file with a
+    // - valid header
+    // - row 0 has too many values
+    // - row 1 is valid
+    // - row 3 is too few values
+    writeFile("animal,color\n"
+              "cat,red,bogus_row_value\n"
+              "lion,green\n"
+              "too_few\n");
+
+    // Create our versioned file, with two columns, one for each
+    // schema version
+    boost::scoped_ptr<VersionedCSVFile> csv(new VersionedCSVFile(testfile_));
+    csv->addColumn("animal", "1.0", "");
+    csv->addColumn("color", "2.0", "blue");
+
+    // Header validation should pass, so we can open
+    ASSERT_NO_THROW(csv->open());
+
+    CSVRow row;
+    // First row has too many
+    EXPECT_FALSE(csv->next(row));
+
+    // Second row is valid
+    ASSERT_TRUE(csv->next(row));
+    EXPECT_EQ("lion", row.readAt(0));
+    EXPECT_EQ("green", row.readAt(1));
+
+    // Third row has too few
+    EXPECT_FALSE(csv->next(row));
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/watch_socket_unittests.cc b/src/lib/util/tests/watch_socket_unittests.cc
new file mode 100644
index 0000000..b503844
--- /dev/null
+++ b/src/lib/util/tests/watch_socket_unittests.cc
@@ -0,0 +1,263 @@
+// Copyright (C) 2014-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+#include <config.h>
+#include <util/watch_socket.h>
+
+#include <gtest/gtest.h>
+
+#include <sys/select.h>
+#include <sys/ioctl.h>
+
+#ifdef HAVE_SYS_FILIO_H
+// FIONREAD is here on Solaris
+#include <sys/filio.h>
+#endif
+
+using namespace std;
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Returns the result of select() given an fd to check for read status.
+///
+/// @param fd_to_check The file descriptor to test
+///
+/// @return Returns less than one on an error, 0 if the fd is not ready to
+/// read, > 0 if it is ready to read. 
+int selectCheck(int fd_to_check) {
+    fd_set read_fds;
+    int maxfd = 0;
+
+    FD_ZERO(&read_fds);
+
+    // Add this socket to listening set
+    FD_SET(fd_to_check,  &read_fds);
+    maxfd = fd_to_check;
+
+    struct timeval select_timeout;
+    select_timeout.tv_sec = 0;
+    select_timeout.tv_usec = 0;
+
+    return (select(maxfd + 1, &read_fds, NULL, NULL, &select_timeout));
+}
+
+/// @brief Tests the basic functionality of WatchSocket.
+TEST(WatchSocketTest, basics) {
+    WatchSocketPtr watch;
+
+    /// Verify that we can construct a WatchSocket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    /// Verify that post-construction the state the select-fd is valid.
+    int select_fd = watch->getSelectFd();
+    EXPECT_NE(select_fd, WatchSocket::SOCKET_NOT_VALID);
+
+    /// Verify that isReady() is false and that a call to select agrees.
+    EXPECT_FALSE(watch->isReady());
+    EXPECT_EQ(0, selectCheck(select_fd));
+
+    /// Verify that the socket can be marked ready.
+    ASSERT_NO_THROW(watch->markReady());
+
+    /// Verify that we have exactly one marker waiting to be read.
+    int count = 0;
+    EXPECT_FALSE(ioctl(select_fd, FIONREAD, &count));
+    EXPECT_EQ(sizeof(WatchSocket::MARKER), count);
+
+    /// Verify that we can call markReady again without error.
+    ASSERT_NO_THROW(watch->markReady());
+
+    /// Verify that we STILL have exactly one marker waiting to be read.
+    EXPECT_FALSE(ioctl(select_fd, FIONREAD, &count));
+    EXPECT_EQ(sizeof(WatchSocket::MARKER), count);
+
+    /// Verify that isReady() is true and that a call to select agrees.
+    EXPECT_TRUE(watch->isReady());
+    EXPECT_EQ(1, selectCheck(select_fd));
+
+    /// Verify that the socket can be cleared.
+    ASSERT_NO_THROW(watch->clearReady());
+
+    /// Verify that isReady() is false and that a call to select agrees.
+    EXPECT_FALSE(watch->isReady());
+    EXPECT_EQ(0, selectCheck(select_fd));
+}
+
+/// @brief Checks behavior when select_fd is closed externally while in the
+/// "cleared" state.
+TEST(WatchSocketTest, closedWhileClear) {
+    WatchSocketPtr watch;
+
+    /// Verify that we can construct a WatchSocket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    /// Verify that post-construction the state the select-fd is valid.
+    int select_fd = watch->getSelectFd();
+    ASSERT_NE(select_fd, WatchSocket::SOCKET_NOT_VALID);
+
+    // Verify that socket does not appear ready.
+    ASSERT_EQ(0, watch->isReady());
+
+    // Interfere by closing the fd.
+    ASSERT_EQ(0, close(select_fd));
+
+    // Verify that socket does not appear ready.
+    ASSERT_EQ(0, watch->isReady());
+
+    // Verify that clear does NOT throw.
+    ASSERT_NO_THROW(watch->clearReady());
+
+    // Verify that trying to mark it fails.
+    ASSERT_THROW(watch->markReady(), WatchSocketError);
+
+    // Verify that clear does NOT throw.
+    ASSERT_NO_THROW(watch->clearReady());
+
+    // Verify that getSelectFd() returns invalid socket.
+    ASSERT_EQ(WatchSocket::SOCKET_NOT_VALID, watch->getSelectFd());
+}
+
+/// @brief Checks behavior when select_fd has closed while in the "ready"
+/// state.
+TEST(WatchSocketTest, closedWhileReady) {
+    WatchSocketPtr watch;
+
+    /// Verify that we can construct a WatchSocket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    /// Verify that post-construction the state the select-fd is valid.
+    int select_fd = watch->getSelectFd();
+    ASSERT_NE(select_fd, WatchSocket::SOCKET_NOT_VALID);
+
+    /// Verify that the socket can be marked ready.
+    ASSERT_NO_THROW(watch->markReady());
+    EXPECT_EQ(1, selectCheck(select_fd));
+    EXPECT_TRUE(watch->isReady());
+
+    // Interfere by closing the fd.
+    ASSERT_EQ(0, close(select_fd));
+
+    // Verify that isReady() does not throw.
+    ASSERT_NO_THROW(watch->isReady());
+
+    // and return false.
+    EXPECT_FALSE(watch->isReady());
+
+    // Verify that trying to clear it does not throw.
+    ASSERT_NO_THROW(watch->clearReady());
+
+    // Verify the select_fd fails as socket is invalid/closed.
+    EXPECT_EQ(-1, selectCheck(select_fd));
+
+    // Verify that subsequent attempts to mark it will fail.
+    ASSERT_THROW(watch->markReady(), WatchSocketError);
+}
+
+/// @brief Checks behavior when select_fd has been marked ready but then
+/// emptied by an external read.
+TEST(WatchSocketTest, emptyReadySelectFd) {
+    WatchSocketPtr watch;
+
+    /// Verify that we can construct a WatchSocket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    /// Verify that post-construction the state the select-fd is valid.
+    int select_fd = watch->getSelectFd();
+    ASSERT_NE(select_fd, WatchSocket::SOCKET_NOT_VALID);
+
+    /// Verify that the socket can be marked ready.
+    ASSERT_NO_THROW(watch->markReady());
+    EXPECT_TRUE(watch->isReady());
+    EXPECT_EQ(1, selectCheck(select_fd));
+
+    // Interfere by reading the fd. This should empty the read pipe.
+    uint32_t buf = 0;
+    ASSERT_EQ((read (select_fd, &buf, sizeof(buf))), sizeof(buf));
+    ASSERT_EQ(WatchSocket::MARKER, buf);
+
+    // Really nothing that can be done to protect against this, but let's
+    // make sure we aren't in a weird state.
+    ASSERT_NO_THROW(watch->clearReady());
+
+    // Verify the select_fd does not fail.
+    EXPECT_FALSE(watch->isReady());
+    EXPECT_EQ(0, selectCheck(select_fd));
+
+    // Verify that getSelectFd() returns is still good.
+    ASSERT_EQ(select_fd, watch->getSelectFd());
+}
+
+/// @brief Checks behavior when select_fd has been marked ready but then
+/// contents have been "corrupted" by a partial read.
+TEST(WatchSocketTest, badReadOnClear) {
+    WatchSocketPtr watch;
+
+    /// Verify that we can construct a WatchSocket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    /// Verify that post-construction the state the select-fd is valid.
+    int select_fd = watch->getSelectFd();
+    ASSERT_NE(select_fd, WatchSocket::SOCKET_NOT_VALID);
+
+    /// Verify that the socket can be marked ready.
+    ASSERT_NO_THROW(watch->markReady());
+    EXPECT_TRUE(watch->isReady());
+    EXPECT_EQ(1, selectCheck(select_fd));
+
+    // Interfere by reading the fd. This should empty the read pipe.
+    uint32_t buf = 0;
+    ASSERT_EQ((read (select_fd, &buf, 1)), 1);
+    ASSERT_NE(WatchSocket::MARKER, buf);
+
+    // Really nothing that can be done to protect against this, but let's
+    // make sure we aren't in a weird state.
+    /// @todo maybe clear should never throw, log only
+    ASSERT_THROW(watch->clearReady(), WatchSocketError);
+
+    // Verify the select_fd does not evaluate to ready.
+    EXPECT_FALSE(watch->isReady());
+    EXPECT_NE(1, selectCheck(select_fd));
+
+    // Verify that getSelectFd() returns INVALID.
+    ASSERT_EQ(WatchSocket::SOCKET_NOT_VALID, watch->getSelectFd());
+
+    // Verify that subsequent attempt to mark it fails.
+    ASSERT_THROW(watch->markReady(), WatchSocketError);
+}
+
+/// @brief Checks if the socket can be explicitly closed.
+TEST(WatchSocketTest, explicitClose) {
+    WatchSocketPtr watch;
+
+    // Create new instance of the socket.
+    ASSERT_NO_THROW(watch.reset(new WatchSocket()));
+    ASSERT_TRUE(watch);
+
+    // Make sure it has been opened by checking that its descriptor
+    // is valid.
+    EXPECT_NE(watch->getSelectFd(), WatchSocket::SOCKET_NOT_VALID);
+
+    // Close the socket.
+    std::string error_string;
+    ASSERT_TRUE(watch->closeSocket(error_string));
+
+    // Make sure that the descriptor is now invalid which indicates
+    // that the socket has been closed.
+    EXPECT_EQ(WatchSocket::SOCKET_NOT_VALID, watch->getSelectFd());
+    // No errors should be reported.
+    EXPECT_TRUE(error_string.empty());
+    // Not ready too.
+    ASSERT_NO_THROW(watch->isReady());
+    EXPECT_FALSE(watch->isReady());
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/util/tests/watched_thread_unittest.cc b/src/lib/util/tests/watched_thread_unittest.cc
new file mode 100644
index 0000000..dd01550
--- /dev/null
+++ b/src/lib/util/tests/watched_thread_unittest.cc
@@ -0,0 +1,218 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <util/watched_thread.h>
+
+#include <gtest/gtest.h>
+
+#include <atomic>
+#include <functional>
+#include <signal.h>
+#include <unistd.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::util;
+
+namespace {
+
+/// @brief Test Fixture for testing @c isc::util::WatchedThread
+class WatchedThreadTest : public ::testing::Test {
+public:
+    /// @brief Maximum number of passes allowed in worker event loop
+    static const int WORKER_MAX_PASSES;
+
+    /// @brief Constructor.
+    WatchedThreadTest() {}
+
+    /// @brief Destructor.
+    ~WatchedThreadTest() {
+    }
+
+    /// @brief Sleeps for a given number of event periods sleep
+    /// Each period is 50 ms.
+    void nap(int periods) {
+        usleep(periods * 50 * 1000);
+    };
+
+    /// @brief Worker function to be used by the WatchedThread's thread
+    ///
+    /// The function runs 10 passes through an "event" loop.
+    /// On each pass:
+    /// - check terminate command
+    /// - instigate the desired event (second pass only)
+    /// - naps for 1 period (50ms)
+    ///
+    /// @param watch_type type of event that should occur
+    void worker(WatchedThread::WatchType watch_type) {
+        sigset_t nsset;
+        pthread_sigmask(SIG_SETMASK, 0, &nsset);
+        EXPECT_EQ(1, sigismember(&nsset, SIGCHLD));
+        EXPECT_EQ(1, sigismember(&nsset, SIGINT));
+        EXPECT_EQ(1, sigismember(&nsset, SIGHUP));
+        EXPECT_EQ(1, sigismember(&nsset, SIGTERM));
+        for (passes_ = 1; passes_ < WORKER_MAX_PASSES; ++passes_) {
+
+            // Stop if we're told to do it.
+            if (wthread_->shouldTerminate()) {
+                return;
+            }
+
+            // On the second pass, set the event.
+            if (passes_ == 2) {
+                switch (watch_type) {
+                case WatchedThread::ERROR:
+                    wthread_->setError("we have an error");
+                    break;
+                case WatchedThread::READY:
+                    wthread_->markReady(watch_type);
+                    break;
+                case WatchedThread::TERMINATE:
+                default:
+                    // Do nothing, we're waiting to be told to stop.
+                    break;
+                }
+            }
+
+            // Take a nap.
+            nap(1);
+        }
+
+        // Indicate why we stopped.
+        wthread_->setError("thread expired");
+    }
+
+    /// @brief Current WatchedThread instance.
+    WatchedThreadPtr wthread_;
+
+    /// @brief Counter used to track the number of passes made
+    /// within the thread worker function.
+    std::atomic<int> passes_;
+};
+
+const int WatchedThreadTest::WORKER_MAX_PASSES = 10;
+
+/// Verifies the basic operation of the WatchedThread class.
+/// It checks that a WatchedThread can be created, can be stopped,
+/// and that in set and clear sockets.
+TEST_F(WatchedThreadTest, watchedThreadClassBasics) {
+
+    /// We'll create a WatchedThread and let it run until it expires.  (Note this is more
+    /// of a test of WatchedThreadTest itself and ensures that the assumptions made in
+    /// our other tests as to why threads have finished are sound.
+    wthread_.reset(new WatchedThread());
+    ASSERT_FALSE(wthread_->isRunning());
+    wthread_->start(std::bind(&WatchedThreadTest::worker, this, WatchedThread::TERMINATE));
+    ASSERT_TRUE(wthread_->isRunning());
+
+    // Wait more long enough (we hope) for the thread to expire.
+    nap(WORKER_MAX_PASSES * 4);
+
+    // It should have done the maximum number of passes.
+    EXPECT_EQ(passes_, WORKER_MAX_PASSES);
+
+    // Error should be ready and error text should be "thread expired".
+    ASSERT_TRUE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+    EXPECT_EQ("thread expired", wthread_->getLastError());
+
+    // Thread is technically still running, so let's stop it.
+    EXPECT_TRUE(wthread_->isRunning());
+    ASSERT_NO_THROW(wthread_->stop());
+    ASSERT_FALSE(wthread_->isRunning());
+
+    /// Now we'll test stopping a thread.
+    /// Start the WatchedThread, let it run a little and then tell it to stop.
+    wthread_->start(std::bind(&WatchedThreadTest::worker, this, WatchedThread::TERMINATE));
+    ASSERT_TRUE(wthread_->isRunning());
+
+    // No watches should be ready.
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+
+    // Wait a little while.
+    nap(3);
+
+    // Tell it to stop.
+    wthread_->stop();
+    ASSERT_FALSE(wthread_->isRunning());
+
+    // It should have done less than the maximum number of passes.
+    EXPECT_LT(passes_, WORKER_MAX_PASSES);
+
+    // No watches should be ready.  Error text should be "thread stopped".
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+    EXPECT_EQ("thread stopped", wthread_->getLastError());
+
+
+    // Next we'll test error notification.
+    // Start the WatchedThread with a thread that sets an error on the second pass.
+    wthread_->start(std::bind(&WatchedThreadTest::worker, this, WatchedThread::ERROR));
+    ASSERT_TRUE(wthread_->isRunning());
+
+    // No watches should be ready.
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+
+    // Wait a little while.
+    nap(6);
+
+    // It should now indicate an error.
+    ASSERT_TRUE(wthread_->isReady(WatchedThread::ERROR));
+    EXPECT_EQ("we have an error", wthread_->getLastError());
+
+    // Tell it to stop.
+    wthread_->stop();
+    ASSERT_FALSE(wthread_->isRunning());
+
+    // It should have done less than the maximum number of passes.
+    EXPECT_LT(passes_, WORKER_MAX_PASSES);
+
+    // No watches should be ready.  Error text should be "thread stopped".
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+    EXPECT_EQ("thread stopped", wthread_->getLastError());
+
+
+    // Finally, we'll test data ready notification.
+    // We'll start the WatchedThread with a thread that indicates data ready on its second pass.
+    wthread_->start(std::bind(&WatchedThreadTest::worker, this, WatchedThread::READY));
+    ASSERT_TRUE(wthread_->isRunning());
+
+    // No watches should be ready.
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+
+    // Wait a little while.
+    nap(6);
+
+    // It should now indicate data ready.
+    ASSERT_TRUE(wthread_->isReady(WatchedThread::READY));
+
+    // Tell it to stop.
+    wthread_->stop();
+    ASSERT_FALSE(wthread_->isRunning());
+
+    // It should have done less than the maximum number of passes.
+    EXPECT_LT(passes_, WORKER_MAX_PASSES);
+
+    // No watches should be ready.  Error text should be "thread stopped".
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::ERROR));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::READY));
+    ASSERT_FALSE(wthread_->isReady(WatchedThread::TERMINATE));
+    EXPECT_EQ("thread stopped", wthread_->getLastError());
+}
+
+}