Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

6 files changed, 3057 insertions, 0 deletions

diff --git a/src/lib/stats/tests/Makefile.am b/src/lib/stats/tests/Makefile.am
new file mode 100644
index 0000000..138a657
--- /dev/null
+++ b/src/lib/stats/tests/Makefile.am
@@ -0,0 +1,37 @@
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diff --git a/src/lib/stats/tests/Makefile.in b/src/lib/stats/tests/Makefile.in
new file mode 100644
index 0000000..beee81b
--- /dev/null
+++ b/src/lib/stats/tests/Makefile.in
@@ -0,0 +1,1042 @@
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+	  report=""; \
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+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
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+	  else \
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+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
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+	    || exit 1; \
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+	-rm -f ./$(DEPDIR)/libstats_unittests-run_unittests.Po
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+	-rm -f ./$(DEPDIR)/libstats_unittests-run_unittests.Po
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+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/stats/tests/context_unittest.cc b/src/lib/stats/tests/context_unittest.cc
new file mode 100644
index 0000000..92c754c
--- /dev/null
+++ b/src/lib/stats/tests/context_unittest.cc
@@ -0,0 +1,126 @@
+// Copyright (C) 2015-2020 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 <stats/context.h>
+#include <gtest/gtest.h>
+#include <util/chrono_time_utils.h>
+#include <string>
+
+using namespace isc::data;
+using namespace isc::stats;
+using namespace std;
+using namespace std::chrono;
+
+// Basic test that checks get, add, del methods
+TEST(ContextTest, basic) {
+
+    // Let's create a couple observations. Using floating point,
+    // as they're easiest to initialize.
+    ObservationPtr a(new Observation("alpha", 1.11));
+    ObservationPtr b(new Observation("beta", 2.22));
+    ObservationPtr c(new Observation("gamma", 3.33));
+    string expected_a = a->getJSON()->str();
+    string expected_b = b->getJSON()->str();
+    string expected_c = c->getJSON()->str();
+
+
+    // Context where we will store the observations.
+    StatContext ctx;
+
+    // By default the context does not hold any statistics.
+    EXPECT_EQ(0, ctx.size());
+
+    // It should be possible to add 'a' statistic
+    EXPECT_NO_THROW(ctx.add(a));
+
+    // We can't add a duplicate.
+    EXPECT_THROW(ctx.add(a), DuplicateStat);
+
+    // It should be ok to add other statistics
+    EXPECT_NO_THROW(ctx.add(b));
+    EXPECT_NO_THROW(ctx.add(c));
+
+    // By now we should have 3 statistics recorded
+    EXPECT_EQ(3, ctx.size());
+
+    // Let's try to retrieve them
+    ObservationPtr from_ctx;
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_a, from_ctx->getJSON()->str());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("beta"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_b, from_ctx->getJSON()->str());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_c, from_ctx->getJSON()->str());
+
+    // Let's try to retrieve non-existing stat
+    EXPECT_NO_THROW(from_ctx = ctx.get("delta"));
+    EXPECT_FALSE(from_ctx);
+
+    // Now delete one of the stats...
+    EXPECT_TRUE(ctx.del("beta"));
+
+    // ... and check that it's really gone.
+    EXPECT_FALSE(ctx.get("beta"));
+
+    // Attempt to delete non-existing stat should fail.
+    EXPECT_FALSE(ctx.del("beta"));
+
+    ConstElementPtr result;
+    EXPECT_NO_THROW(result = ctx.getAll());
+
+    ASSERT_TRUE(result);
+    ElementPtr expected_result = Element::createMap();
+    expected_result->set("alpha", a->getJSON());
+    expected_result->set("gamma", c->getJSON());
+    EXPECT_EQ(result->str(), expected_result->str());
+
+    // Reset all statistics.
+    EXPECT_NO_THROW(ctx.resetAll());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_NE(expected_a, from_ctx->getJSON()->str());
+    EXPECT_EQ(0.0, a->getFloat().first);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_NE(expected_c, from_ctx->getJSON()->str());
+    EXPECT_EQ(0.0, c->getFloat().first);
+
+    // Set sample count for all statistics
+    EXPECT_NO_THROW(ctx.setMaxSampleCountAll(50));
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleCount().second, 50);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleCount().second, 50);
+
+    // Set sample age for all statistics
+    const StatsDuration& dur(minutes(4) + seconds(5) + milliseconds(3));
+    EXPECT_NO_THROW(ctx.setMaxSampleAgeAll(dur));
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleAge().second, dur);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleAge().second, dur);
+
+    // Clear all statistics.
+    EXPECT_NO_THROW(ctx.clear());
+    EXPECT_EQ(0, ctx.size());
+}
diff --git a/src/lib/stats/tests/observation_unittest.cc b/src/lib/stats/tests/observation_unittest.cc
new file mode 100644
index 0000000..63fbece
--- /dev/null
+++ b/src/lib/stats/tests/observation_unittest.cc
@@ -0,0 +1,717 @@
+// 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 <exceptions/exceptions.h>
+#include <stats/observation.h>
+#include <util/chrono_time_utils.h>
+#include <util/bigints.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <gtest/gtest.h>
+
+#include <iostream>
+#include <sstream>
+
+#include <unistd.h>
+
+using namespace isc;
+using namespace isc::stats;
+using namespace isc::util;
+using namespace std::chrono;
+
+namespace {
+
+static const StatsDuration& dur1234(hours(1) + minutes(2) + seconds(3) +
+                                    milliseconds(4));
+static const StatsDuration& dur5678(hours(5) + minutes(6) + seconds(7) +
+                                    milliseconds(8));
+static const StatsDuration& dur681012(hours(6) + minutes(8) + seconds(10) +
+                                      milliseconds(12));
+static const StatsDuration& dur453(minutes(4) + seconds(5) + milliseconds(3));
+
+// This test verifies that the number of seconds can be retrieved.
+TEST(StatsDurationTest, toSeconds) {
+    StatsDuration dur = StatsDuration::zero();
+    dur += hours(1) + minutes(1) + seconds(1) + milliseconds(1);
+    EXPECT_EQ(3661, toSeconds(dur));
+}
+
+/// @brief Test class for Observation
+///
+/// This simple fixture class initializes four observations:
+/// a (integer), b (float), c(time duration) and d (string).
+class ObservationTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    /// Initializes four observations.
+    ObservationTest() :
+        a("alpha", static_cast<int64_t>(1234)), // integer
+        b("beta", 12.34), // float
+        c("gamma", dur1234), // duration
+        d("delta", "1234"), // string
+        e("epsilon", int128_t(12e34)) { // big integer
+    }
+
+    Observation a;
+    Observation b;
+    Observation c;
+    Observation d;
+    Observation e;
+};
+
+// Basic tests for the Observation constructors. This test checks whether
+// parameters passed to the constructor initialize the object properly.
+TEST_F(ObservationTest, constructor) {
+    EXPECT_EQ(Observation::STAT_INTEGER, a.getType());
+    EXPECT_EQ(Observation::STAT_FLOAT, b.getType());
+    EXPECT_EQ(Observation::STAT_DURATION, c.getType());
+    EXPECT_EQ(Observation::STAT_STRING, d.getType());
+    EXPECT_EQ(Observation::STAT_BIG_INTEGER, e.getType());
+
+    EXPECT_EQ(1234, a.getInteger().first);
+    EXPECT_EQ(12.34, b.getFloat().first);
+    EXPECT_EQ(dur1234, c.getDuration().first);
+    EXPECT_EQ("1234", d.getString().first);
+    EXPECT_EQ(int128_t(12e34), e.getBigInteger().first);
+
+    // Let's check that attempting to get a different type
+    // than used will cause an exception.
+    EXPECT_THROW(a.getFloat(), InvalidStatType);
+    EXPECT_THROW(a.getDuration(), InvalidStatType);
+    EXPECT_THROW(a.getString(), InvalidStatType);
+    EXPECT_THROW(a.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(b.getInteger(), InvalidStatType);
+    EXPECT_THROW(b.getDuration(), InvalidStatType);
+    EXPECT_THROW(b.getString(), InvalidStatType);
+    EXPECT_THROW(b.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(c.getInteger(), InvalidStatType);
+    EXPECT_THROW(c.getFloat(), InvalidStatType);
+    EXPECT_THROW(c.getString(), InvalidStatType);
+    EXPECT_THROW(c.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(d.getInteger(), InvalidStatType);
+    EXPECT_THROW(d.getFloat(), InvalidStatType);
+    EXPECT_THROW(d.getDuration(), InvalidStatType);
+    EXPECT_THROW(d.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(e.getInteger(), InvalidStatType);
+    EXPECT_THROW(e.getFloat(), InvalidStatType);
+    EXPECT_THROW(e.getDuration(), InvalidStatType);
+    EXPECT_THROW(e.getString(), InvalidStatType);
+}
+
+// This test checks whether it is possible to set to an absolute value for all
+// given types.
+TEST_F(ObservationTest, setValue) {
+    EXPECT_NO_THROW(a.setValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.setValue(56e+78));
+    EXPECT_NO_THROW(c.setValue(dur5678));
+    EXPECT_NO_THROW(d.setValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.setValue(int128_t(43e21)));
+
+    EXPECT_EQ(5678, a.getInteger().first);
+    EXPECT_EQ(56e+78, b.getFloat().first);
+    EXPECT_EQ(dur5678, c.getDuration().first);
+    EXPECT_EQ("fiveSixSevenEight", d.getString().first);
+    EXPECT_EQ(int128_t(43e21), e.getBigInteger().first);
+
+    // Now check whether setting value to a different type does
+    // throw an exception
+    EXPECT_THROW(a.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(a.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(a.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(a.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(b.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(b.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(b.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(b.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(c.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(c.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(c.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(c.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(d.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(d.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(d.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(d.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(e.setValue(int64_t(5678)), InvalidStatType);
+    EXPECT_THROW(e.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(e.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(e.setValue("fiveSixSevenEight"), InvalidStatType);
+}
+
+// This test checks whether it is possible to add value to existing
+// counter.
+TEST_F(ObservationTest, addValue) {
+    // Note: all Observations were set to 1234, 12.34 or similar in
+    // ObservationTest constructor.
+
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    EXPECT_EQ(6912, a.getInteger().first);
+    EXPECT_EQ(69.12, b.getFloat().first);
+    EXPECT_EQ(dur681012, c.getDuration().first);
+    EXPECT_EQ("1234fiveSixSevenEight", d.getString().first);
+    EXPECT_EQ(int128_t(12e34) + int128_t(43e21), e.getBigInteger().first);
+
+    ASSERT_EQ(a.getSize(), 2);
+    ASSERT_EQ(b.getSize(), 2);
+    ASSERT_EQ(c.getSize(), 2);
+    ASSERT_EQ(d.getSize(), 2);
+    ASSERT_EQ(e.getSize(), 2);
+}
+
+// This test checks if collecting more than one sample
+// works well.
+TEST_F(ObservationTest, moreThanOne) {
+    // Arrays of 4 types of samples
+    int64_t int_samples[3] = {1234, 6912, 5678};
+    double float_samples[3] = {12.34, 69.12, 56e+78};
+    StatsDuration duration_samples[3] = {dur1234, dur681012, dur5678};
+    std::string string_samples[3] = {"1234", "1234fiveSixSevenEight", "fiveSixSevenEight"};
+    int128_t bigint_samples[3] = {int128_t(12e34), int128_t(12e34) + int128_t(43e21),
+                                  int128_t(43e21)};
+
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    EXPECT_NO_THROW(a.setValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.setValue(56e+78));
+    EXPECT_NO_THROW(c.setValue(dur5678));
+    EXPECT_NO_THROW(d.setValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.setValue(int128_t(43e21)));
+
+    ASSERT_EQ(a.getSize(), 3);
+    ASSERT_EQ(b.getSize(), 3);
+    ASSERT_EQ(c.getSize(), 3);
+    ASSERT_EQ(d.getSize(), 3);
+    ASSERT_EQ(e.getSize(), 3);
+
+    ASSERT_NO_THROW(a.getIntegers());
+    ASSERT_NO_THROW(b.getFloats());
+    ASSERT_NO_THROW(c.getDurations());
+    ASSERT_NO_THROW(d.getStrings());
+    ASSERT_NO_THROW(e.getBigIntegers());
+
+    std::list<IntegerSample> samples_int = a.getIntegers(); // List of all integer samples
+    std::list<FloatSample> samples_float = b.getFloats(); // List of all float samples
+    std::list<DurationSample> samples_dur = c.getDurations(); // List of all duration samples
+    std::list<StringSample> samples_str = d.getStrings(); // List of all string samples
+    std::list<BigIntegerSample> samples_bigint = e.getBigIntegers(); // List of all big integer samples
+
+    uint32_t i = 2; // Index pointed to the end of array of samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ(int_samples[i], static_cast<int64_t>((*it).first));
+        --i;
+    }
+    i = 2;
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ(float_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (std::list<DurationSample>::iterator it = samples_dur.begin(); it != samples_dur.end(); ++it) {
+        EXPECT_EQ(duration_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (std::list<StringSample>::iterator it = samples_str.begin(); it != samples_str.end(); ++it) {
+        EXPECT_EQ(string_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(bigint_samples[i], sample.first);
+        --i;
+    }
+}
+
+// This test checks whether the size of storage
+// is equal to the true value
+TEST_F(ObservationTest, getSize) {
+    // Check if size of storages is equal to 1
+    ASSERT_EQ(a.getSize(), 1);
+    ASSERT_EQ(b.getSize(), 1);
+    ASSERT_EQ(c.getSize(), 1);
+    ASSERT_EQ(d.getSize(), 1);
+    ASSERT_EQ(e.getSize(), 1);
+
+    a.addValue(static_cast<int64_t>(5678));
+    b.addValue(56.78);
+    c.addValue(dur5678);
+    d.addValue("fiveSixSevenEight");
+    e.addValue(int128_t(43e21));
+
+    EXPECT_NO_THROW(a.getSize());
+    EXPECT_NO_THROW(b.getSize());
+    EXPECT_NO_THROW(c.getSize());
+    EXPECT_NO_THROW(d.getSize());
+    EXPECT_NO_THROW(e.getSize());
+
+    // Check if size of storages is equal to 2
+    ASSERT_EQ(a.getSize(), 2);
+    ASSERT_EQ(b.getSize(), 2);
+    ASSERT_EQ(c.getSize(), 2);
+    ASSERT_EQ(d.getSize(), 2);
+    ASSERT_EQ(e.getSize(), 2);
+
+    a.setValue(static_cast<int64_t>(5678));
+    b.setValue(56e+78);
+    c.setValue(dur5678);
+    d.setValue("fiveSixSevenEight");
+    e.setValue(int128_t(43e21));
+
+    EXPECT_NO_THROW(a.getSize());
+    EXPECT_NO_THROW(b.getSize());
+    EXPECT_NO_THROW(c.getSize());
+    EXPECT_NO_THROW(d.getSize());
+
+    // Check if size of storages is equal to 3
+    ASSERT_EQ(a.getSize(), 3);
+    ASSERT_EQ(b.getSize(), 3);
+    ASSERT_EQ(c.getSize(), 3);
+    ASSERT_EQ(d.getSize(), 3);
+    ASSERT_EQ(e.getSize(), 3);
+}
+
+// Checks whether setting amount limits works properly
+TEST_F(ObservationTest, setCountLimit) {
+    // Preparing of 21 test's samples for each type of storage
+    int64_t int_samples[22] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+            14, 15, 16, 17, 18, 19, 20, 21};
+    double float_samples[22] = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
+            9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0,
+            20.0, 21.0};
+    std::string string_samples[22] = {"a", "b", "c", "d", "e", "f", "g", "h",
+            "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
+            "v"};
+    StatsDuration duration_samples[22];
+
+    for (uint32_t i = 0; i < 22; ++i) {
+        duration_samples[i] = milliseconds(i);
+    }
+
+    // By default the max_sample_count is set to 20 and max_sample_age
+    // is deactivated
+    // Adding 21 samples to each type of Observation
+    for (uint32_t i = 0; i < 21; ++i) {
+        a.setValue(int_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        b.setValue(float_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        c.setValue(duration_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        d.setValue(string_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        e.setValue(int128_t(int_samples[i]));
+    }
+
+    // Getting all 4 types of samples after inserting 21 values
+    std::list<IntegerSample> samples_int = a.getIntegers();
+    std::list<FloatSample> samples_float = b.getFloats();
+    std::list<DurationSample> samples_duration = c.getDurations();
+    std::list<StringSample> samples_string = d.getStrings();
+    std::list<BigIntegerSample> samples_bigint = e.getBigIntegers();
+
+    // Check if size of storages is equal to 20
+    ASSERT_EQ(a.getSize(), 20);
+    ASSERT_EQ(b.getSize(), 20);
+    ASSERT_EQ(c.getSize(), 20);
+    ASSERT_EQ(d.getSize(), 20);
+    ASSERT_EQ(e.getSize(), 20);
+
+    // And whether stored values are correct
+    uint32_t i = 20; // index of the last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+
+    // Change size of storage to smaller one
+    ASSERT_NO_THROW(a.setMaxSampleCount(10));
+    ASSERT_NO_THROW(b.setMaxSampleCount(10));
+    ASSERT_NO_THROW(c.setMaxSampleCount(10));
+    ASSERT_NO_THROW(d.setMaxSampleCount(10));
+    ASSERT_NO_THROW(e.setMaxSampleCount(10));
+
+    samples_int = a.getIntegers();
+    samples_float = b.getFloats();
+    samples_duration = c.getDurations();
+    samples_string = d.getStrings();
+    samples_bigint = e.getBigIntegers();
+
+    // Check if size of storages is equal to 10
+    ASSERT_EQ(a.getSize(), 10);
+    ASSERT_EQ(b.getSize(), 10);
+    ASSERT_EQ(c.getSize(), 10);
+    ASSERT_EQ(d.getSize(), 10);
+    ASSERT_EQ(e.getSize(), 10);
+
+    // And whether storages contain only the 10 newest values
+    i = 20; // index of last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+
+    // Resize max_sample_count to greater
+    ASSERT_NO_THROW(a.setMaxSampleCount(50));
+    ASSERT_NO_THROW(b.setMaxSampleCount(50));
+    ASSERT_NO_THROW(c.setMaxSampleCount(50));
+    ASSERT_NO_THROW(d.setMaxSampleCount(50));
+    ASSERT_NO_THROW(e.setMaxSampleCount(50));
+
+    // Check if size of storages did not change without adding new value
+    ASSERT_EQ(a.getSize(), 10);
+    ASSERT_EQ(b.getSize(), 10);
+    ASSERT_EQ(c.getSize(), 10);
+    ASSERT_EQ(d.getSize(), 10);
+    ASSERT_EQ(e.getSize(), 10);
+
+    // Add new values to each type of Observation
+    a.setValue(static_cast<int64_t>(21));
+    b.setValue(21.0);
+    c.setValue(milliseconds(21));
+    d.setValue("v");
+    e.setValue(int128_t(21));
+
+    samples_int = a.getIntegers();
+    samples_float = b.getFloats();
+    samples_duration = c.getDurations();
+    samples_string = d.getStrings();
+    samples_bigint = e.getBigIntegers();
+
+    ASSERT_EQ(a.getSize(), 11);
+    ASSERT_EQ(b.getSize(), 11);
+    ASSERT_EQ(c.getSize(), 11);
+    ASSERT_EQ(d.getSize(), 11);
+    ASSERT_EQ(e.getSize(), 11);
+
+    i = 21; // index of last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+}
+
+// Checks whether setting age limits works properly
+TEST_F(ObservationTest, setAgeLimit) {
+    // Set max_sample_age to 1 second
+    ASSERT_NO_THROW(c.setMaxSampleAge(seconds(1)));
+    // Add some value
+    c.setValue(milliseconds(5));
+    // Wait 1 second
+    sleep(1);
+    // and add new value
+    c.setValue(milliseconds(3));
+
+    // get the list of all samples
+    std::list<DurationSample> samples_duration = c.getDurations();
+    // check whether the size of samples is equal to 1
+    ASSERT_EQ(c.getSize(), 1);
+    // and whether it contains an expected value
+    EXPECT_EQ((*samples_duration.begin()).first, milliseconds(3));
+
+    // Wait 1 second to ensure removing previously set value
+    sleep(1);
+    // add 10 new values
+    for (uint32_t i = 0; i < 10; ++i) {
+        c.setValue(milliseconds(i));
+    }
+    // change the max_sample_age to smaller
+    ASSERT_NO_THROW(c.setMaxSampleAge(milliseconds(300)));
+
+    samples_duration = c.getDurations();
+    // check whether the size of samples is equal to 10
+    ASSERT_EQ(c.getSize(), 10);
+
+    // and whether it contains expected values
+    uint32_t i = 9;
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, milliseconds(i));
+        --i;
+    }
+}
+
+// Test checks whether we can get max_sample_age_ and max_sample_count_
+// properly.
+TEST_F(ObservationTest, getLimits) {
+    // First checks whether getting default values works properly
+    EXPECT_EQ(a.getMaxSampleAge().first, false);
+    EXPECT_EQ(b.getMaxSampleAge().first, false);
+    EXPECT_EQ(c.getMaxSampleAge().first, false);
+    EXPECT_EQ(d.getMaxSampleAge().first, false);
+    EXPECT_EQ(e.getMaxSampleAge().first, false);
+
+    EXPECT_EQ(a.getMaxSampleCount().first, true);
+    EXPECT_EQ(b.getMaxSampleCount().first, true);
+    EXPECT_EQ(c.getMaxSampleCount().first, true);
+    EXPECT_EQ(d.getMaxSampleCount().first, true);
+    EXPECT_EQ(e.getMaxSampleCount().first, true);
+
+    EXPECT_EQ(a.getMaxSampleCount().second, 20);
+    EXPECT_EQ(b.getMaxSampleCount().second, 20);
+    EXPECT_EQ(c.getMaxSampleCount().second, 20);
+    EXPECT_EQ(d.getMaxSampleCount().second, 20);
+    EXPECT_EQ(e.getMaxSampleCount().second, 20);
+
+    // change limit to time duration
+    ASSERT_NO_THROW(a.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(b.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(c.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(d.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(e.setMaxSampleAge(dur453));
+
+    EXPECT_EQ(a.getMaxSampleAge().first, true);
+    EXPECT_EQ(b.getMaxSampleAge().first, true);
+    EXPECT_EQ(c.getMaxSampleAge().first, true);
+    EXPECT_EQ(d.getMaxSampleAge().first, true);
+    EXPECT_EQ(e.getMaxSampleAge().first, true);
+
+    EXPECT_EQ(a.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(b.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(c.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(d.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(e.getMaxSampleAge().second, dur453);
+
+    EXPECT_EQ(a.getMaxSampleCount().first, false);
+    EXPECT_EQ(b.getMaxSampleCount().first, false);
+    EXPECT_EQ(c.getMaxSampleCount().first, false);
+    EXPECT_EQ(d.getMaxSampleCount().first, false);
+    EXPECT_EQ(e.getMaxSampleCount().first, false);
+
+    EXPECT_EQ(a.getMaxSampleCount().second, 20);
+    EXPECT_EQ(b.getMaxSampleCount().second, 20);
+    EXPECT_EQ(c.getMaxSampleCount().second, 20);
+    EXPECT_EQ(d.getMaxSampleCount().second, 20);
+    EXPECT_EQ(e.getMaxSampleCount().second, 20);
+}
+
+// limit defaults are tested with StatsMgr.
+
+// Test checks whether timing is reported properly.
+TEST_F(ObservationTest, timers) {
+    auto before = SampleClock::now();
+    b.setValue(123.0); // Set it to a random value and record the time.
+
+    // Allow a bit of imprecision. This test allows 500ms. That should be ok,
+    // when running on virtual machines.
+    auto after = before + milliseconds(500);
+
+    // Now wait some time. We want to confirm that the timestamp recorded is the
+    // time the observation took place, not current time.
+    sleep(1);
+
+    FloatSample sample = b.getFloat();
+
+    // Let's check that the timestamp is within (before, after) range:
+    // before < sample-time < after
+    EXPECT_TRUE(before <= sample.second);
+    EXPECT_TRUE(sample.second <= after);
+}
+
+// Checks whether an integer statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+/// for details.
+TEST_F(ObservationTest, integerToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 1234, \"" +
+        isc::util::clockToText(a.getInteger().second) + "\" ] ]";
+
+    a.setValue(static_cast<int64_t>(1234));
+
+    std::string exp = "[ [ 1234, \"" +
+        isc::util::clockToText(a.getInteger().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, a.getJSON()->str());
+}
+
+// Checks whether a floating point statistic can generate proper JSON
+// structures. See
+/// https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+/// for details.
+TEST_F(ObservationTest, floatToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 12.34, \"" +
+        isc::util::clockToText(b.getFloat().second) + "\" ] ]";
+
+    // Let's use a value that converts easily to floating point.
+    // No need to deal with infinite fractions in binary systems.
+
+    b.setValue(1234.5);
+
+    std::string exp = "[ [ 1234.5, \"" +
+        isc::util::clockToText(b.getFloat().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, b.getJSON()->str());
+}
+
+// Checks whether a time duration statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design for
+// details.
+TEST_F(ObservationTest, durationToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(c.getDuration().second) + "\" ] ]";
+
+    // 1 hour 2 minutes 3 seconds and 4 milliseconds
+    c.setValue(dur1234);
+
+    std::string exp = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(c.getDuration().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, c.getJSON()->str());
+}
+
+// Checks whether a string statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+// for details.
+TEST_F(ObservationTest, stringToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ \"1234\", \"" +
+        isc::util::clockToText(d.getString().second) + "\" ] ]";
+
+    d.setValue("Lorem ipsum dolor sit amet");
+
+    std::string exp = "[ [ \"Lorem ipsum dolor sit amet\", \"" +
+        isc::util::clockToText(d.getString().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, d.getJSON()->str());
+}
+
+// Checks whether a big integer statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+// for details.
+TEST_F(ObservationTest, bigIntegerToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 120000000000000007304085773727301632, \"" +
+        isc::util::clockToText(e.getBigInteger().second) + "\" ] ]";
+
+    e.setValue(int128_t(43e21));
+
+    std::string exp = "[ [ 43000000000000002097152, \"" +
+        isc::util::clockToText(e.getBigInteger().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, e.getJSON()->str());
+}
+
+// Checks whether reset() resets the statistics properly.
+TEST_F(ObservationTest, reset) {
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    a.reset(); // integer
+    b.reset(); // float
+    c.reset(); // duration
+    d.reset(); // string
+    e.reset(); // big integer
+
+    EXPECT_EQ(0, a.getInteger().first);
+    EXPECT_EQ(0.0, b.getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(), c.getDuration().first);
+    EXPECT_EQ("", d.getString().first);
+    EXPECT_EQ(0, e.getBigInteger().first);
+
+    ASSERT_EQ(a.getSize(), 1);
+    ASSERT_EQ(b.getSize(), 1);
+    ASSERT_EQ(c.getSize(), 1);
+    ASSERT_EQ(d.getSize(), 1);
+    ASSERT_EQ(e.getSize(), 1);
+}
+
+// Checks whether an observation can keep its name.
+TEST_F(ObservationTest, names) {
+    EXPECT_EQ("alpha", a.getName());
+    EXPECT_EQ("beta", b.getName());
+    EXPECT_EQ("gamma", c.getName());
+    EXPECT_EQ("delta", d.getName());
+    EXPECT_EQ("epsilon", e.getName());
+}
+
+}  // namespace
diff --git a/src/lib/stats/tests/run_unittests.cc b/src/lib/stats/tests/run_unittests.cc
new file mode 100644
index 0000000..9d621ae
--- /dev/null
+++ b/src/lib/stats/tests/run_unittests.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 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 <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/stats/tests/stats_mgr_unittest.cc b/src/lib/stats/tests/stats_mgr_unittest.cc
new file mode 100644
index 0000000..734d134
--- /dev/null
+++ b/src/lib/stats/tests/stats_mgr_unittest.cc
@@ -0,0 +1,1117 @@
+// Copyright (C) 2015-2020 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 <stats/stats_mgr.h>
+#include <exceptions/exceptions.h>
+#include <cc/data.h>
+#include <cc/command_interpreter.h>
+#include <util/chrono_time_utils.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <iostream>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::data;
+using namespace isc::stats;
+using namespace isc::config;
+using namespace std::chrono;
+
+namespace {
+
+static const StatsDuration& dur1234(hours(1) + minutes(2) + seconds(3) +
+                                    milliseconds(4));
+static const StatsDuration& dur5678(hours(5) + minutes(6) + seconds(7) +
+                                    milliseconds(8));
+static const StatsDuration& dur1245(hours(1) + minutes(2) + seconds(45));
+
+/// @brief Fixture class for StatsMgr testing
+///
+/// Very simple class that makes sure that StatsMgr is indeed instantiated
+/// before the test and any statistics are wiped out after it.
+class StatsMgrTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    /// Makes sure that the Statistics Manager is instantiated.
+    StatsMgrTest() {
+        StatsMgr::instance();
+        StatsMgr::instance().removeAll();
+    }
+
+    /// @brief Destructor
+    /// Removes all statistics and restores class defaults.
+    ~StatsMgrTest() {
+        StatsMgr::instance().removeAll();
+        StatsMgr::instance().setMaxSampleAgeDefault(StatsDuration::zero());
+        StatsMgr::instance().setMaxSampleCountDefault(20);
+    }
+};
+
+// Basic test for statistics manager interface.
+TEST_F(StatsMgrTest, basic) {
+    // Getting an instance
+    EXPECT_NO_THROW(StatsMgr::instance());
+
+    // Check that there are no statistics recorded by default.
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// Test checks whether it's possible to record and later report
+// an integer statistic.
+TEST_F(StatsMgrTest, integerStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("alpha",
+                                                  static_cast<int64_t>(1234)));
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    std::string exp = "{ \"alpha\": [ [ 1234, \"" +
+        isc::util::clockToText(alpha->getInteger().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("alpha")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a floating point statistic.
+TEST_F(StatsMgrTest, floatStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("beta", 12.34));
+
+    ObservationPtr beta;
+    EXPECT_NO_THROW(beta = StatsMgr::instance().getObservation("beta"));
+    ASSERT_TRUE(beta);
+
+    std::string exp = "{ \"beta\": [ [ 12.34, \"" +
+        isc::util::clockToText(beta->getFloat().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("beta")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a duration statistic.
+TEST_F(StatsMgrTest, durationStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("gamma", dur1234));
+
+    ObservationPtr gamma;
+    EXPECT_NO_THROW(gamma = StatsMgr::instance().getObservation("gamma"));
+    ASSERT_TRUE(gamma);
+
+    std::string exp = "{ \"gamma\": [ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(gamma->getDuration().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("gamma")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a string statistic.
+TEST_F(StatsMgrTest, stringStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("delta",
+                                                  "Lorem ipsum"));
+
+    ObservationPtr delta;
+    EXPECT_NO_THROW(delta = StatsMgr::instance().getObservation("delta"));
+    ASSERT_TRUE(delta);
+
+    std::string exp = "{ \"delta\": [ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(delta->getString().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("delta")->str());
+}
+
+// Basic test of getSize function.
+TEST_F(StatsMgrTest, getSize) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("alpha"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("beta"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("gamma"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("delta"));
+
+    EXPECT_EQ(StatsMgr::instance().getSize("alpha"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("beta"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("gamma"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("delta"), 1);
+}
+
+// Test checks whether setting age limit and count limit works properly.
+TEST_F(StatsMgrTest, setLimits) {
+    // Initializing of an integer type observation
+    StatsMgr::instance().setValue("foo", static_cast<int64_t>(1));
+
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAge("foo",
+                                                         seconds(1)));
+
+    for (uint32_t i = 0; i < 10; ++i) {
+        if (i == 5) {
+            sleep(1); // wait one second to force exceeding the time limit
+        }
+        StatsMgr::instance().setValue("foo", static_cast<int64_t>(i));
+    }
+
+    EXPECT_EQ(StatsMgr::instance().getSize("foo"), 5);
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCount("foo", 100));
+
+    for (int64_t i = 0; i < 200; ++i) {
+        StatsMgr::instance().setValue("foo", i);
+    }
+
+    EXPECT_EQ(StatsMgr::instance().getSize("foo"), 100);
+}
+
+// Test checks whether setting age limit and count limit to existing
+// statistics works properly.
+TEST_F(StatsMgrTest, setLimitsAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // check the setting of time limit to existing statistics
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeAll(seconds(1)));
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+
+    // check the setting of count limit to existing statistics
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountAll(1200));
+
+    // check if count limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+}
+
+// Test checks whether setting default age limit and count limit works
+// properly.
+TEST_F(StatsMgrTest, setLimitsDefault) {
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 20);
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), StatsDuration::zero());
+
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // check what default applied
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, StatsDuration::zero());
+
+    // Retry with another default count limits.
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(10));
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeDefault(seconds(5)));
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 10);
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), seconds(5));
+
+    // Check the existing statistics were not updated.
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, StatsDuration::zero());
+
+    // Remove all test statistics.
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    // Retry with count limit disable.
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(0));
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 0);
+
+    // Check the existing statistics were not updated.
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    // Remove all test statistics.
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(20));
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeDefault(StatsDuration::zero()));
+}
+
+// This test checks whether a single (get("foo")) and all (getAll())
+// statistics are reported properly.
+TEST_F(StatsMgrTest, getGetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem");
+
+    // The string's representation of firstly added statistics
+    std::string alpha_first = ", [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string beta_first = ", [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string gamma_first = ", [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string delta_first = ", [ \"Lorem\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Now add some values to them
+    StatsMgr::instance().addValue("alpha", static_cast<int64_t>(5678));
+    StatsMgr::instance().addValue("beta", 56.78);
+    StatsMgr::instance().addValue("gamma", dur5678);
+    StatsMgr::instance().addValue("delta", " ipsum");
+
+    // There should be 4 statistics reported
+    EXPECT_EQ(4, StatsMgr::instance().count());
+
+    // Now check whether they can be reported back
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 6912, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ]" + alpha_first;
+    std::string exp_str_beta = "[ [ 69.12, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ]" + beta_first;
+    std::string exp_str_gamma = "[ [ \"06:08:10.012000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ]" + gamma_first;
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ]" + delta_first;
+
+    // Check that individual stats are reported properly
+    EXPECT_EQ("{ \"alpha\": " + exp_str_alpha + " }", rep_alpha->str());
+    EXPECT_EQ("{ \"beta\": " + exp_str_beta + " }", rep_beta->str());
+    EXPECT_EQ("{ \"gamma\": " + exp_str_gamma + " }", rep_gamma->str());
+    EXPECT_EQ("{ \"delta\": " + exp_str_delta + " }", rep_delta->str());
+
+    // Check that non-existent metric is not reported.
+    EXPECT_EQ("{  }", StatsMgr::instance().get("epsilon")->str());
+
+    // Check that all of them can be reported at once
+    ConstElementPtr rep_all = StatsMgr::instance().getAll();
+    ASSERT_TRUE(rep_all);
+
+    // Verifying this is a bit more involved, as we don't know whether the
+    // order would be preserved or not.
+    EXPECT_EQ(4, rep_all->size());
+    ASSERT_TRUE(rep_all->get("alpha"));
+    ASSERT_TRUE(rep_all->get("beta"));
+    ASSERT_TRUE(rep_all->get("delta"));
+    ASSERT_TRUE(rep_all->get("gamma"));
+    EXPECT_FALSE(rep_all->get("epsilon"));
+
+    EXPECT_EQ(exp_str_alpha, rep_all->get("alpha")->str());
+    EXPECT_EQ(exp_str_beta, rep_all->get("beta")->str());
+    EXPECT_EQ(exp_str_gamma, rep_all->get("gamma")->str());
+    EXPECT_EQ(exp_str_delta, rep_all->get("delta")->str());
+}
+
+// This test checks whether existing statistics can be reset.
+TEST_F(StatsMgrTest, reset) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().reset("alpha"));
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+
+    // The other stats should remain untouched
+    EXPECT_EQ(12.34,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(dur1234,
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("Lorem ipsum",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Now let's wipe them, too.
+    EXPECT_NO_THROW(StatsMgr::instance().reset("beta"));
+    EXPECT_NO_THROW(StatsMgr::instance().reset("gamma"));
+    EXPECT_NO_THROW(StatsMgr::instance().reset("delta"));
+    EXPECT_EQ(0.0,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Resetting statistics should not remove them
+    EXPECT_EQ(4, StatsMgr::instance().count());
+}
+
+// This test checks whether existing statistics can be reset.
+TEST_F(StatsMgrTest, resetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().resetAll());
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+    EXPECT_EQ(0.0,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Resetting all statistics should not remove them
+    EXPECT_EQ(4, StatsMgr::instance().count());
+}
+
+// This test checks whether statistics can be removed.
+TEST_F(StatsMgrTest, removeAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    // Resetting all statistics should not remove them
+    EXPECT_EQ(0, StatsMgr::instance().count());
+
+    // There should be no such statistics anymore
+    EXPECT_EQ("{  }", StatsMgr::instance().get("alpha")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("beta")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("gamma")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("delta")->str());
+
+    // There should be no such statistics anymore
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("beta"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("gamma"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("delta"));
+}
+
+// This is a performance benchmark that checks how long does it take
+// to increment a single statistic million times.
+//
+// Data points:
+// It took 00:00:00.363709 (363ms) on late 2013 Mac with Mac OS X 10.9.5.
+TEST_F(StatsMgrTest, DISABLED_performanceSingleAdd) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().addValue("metric1", 0.1 * i);
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Incrementing a single statistic " << cycles << " times took: "
+              << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take
+// to set absolute value of a single statistic million times.
+//
+// Data points:
+// It took 00:00:00.361003 (361ms) on late 2013 Mac with Mac OS X 10.9.5.
+TEST_F(StatsMgrTest, DISABLED_performanceSingleSet) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().setValue("metric1", 0.1 * i);
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Setting a single statistic " << cycles << " times took: "
+              << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take to
+// increment one statistic a million times, when there is 1000 other statistics
+// present.
+//
+// Data points:
+// 00:00:00.436943 (436ms) on late 2013 Mac with Mac OS X 10.9.5
+TEST_F(StatsMgrTest, DISABLED_performanceMultipleAdd) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+    uint32_t stats = 1000;
+
+    for (uint32_t i = 0; i < stats; ++i) {
+        std::stringstream tmp;
+        tmp << "statistic" << i;
+        StatsMgr::instance().setValue(tmp.str(), static_cast<int64_t>(i));
+    }
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().addValue("metric1", static_cast<int64_t>(i));
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Incrementing one of " << stats << " statistics " << cycles
+              << " times took: " << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take to
+// set one statistic to a given value a million times, when there is 1000 other
+// statistics present.
+//
+// Data points:
+// 00:00:00.424518 (424ms) on late 2013 Mac with Mac OS X 10.9.5
+TEST_F(StatsMgrTest, DISABLED_performanceMultipleSet) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+    uint32_t stats = 1000;
+
+    for (uint32_t i = 0; i < stats; ++i) {
+        std::stringstream tmp;
+        tmp << "statistic" << i;
+        StatsMgr::instance().setValue(tmp.str(), static_cast<int64_t>(i));
+    }
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().setValue("metric1", static_cast<int64_t>(i));
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Setting one of " << stats << " statistics " << cycles
+              << " times took: " << isc::util::durationToText(dur) << std::endl;
+}
+
+// Test checks whether statistics name can be generated using various
+// indexes.
+TEST_F(StatsMgrTest, generateName) {
+    // generateName is a templated method, so in principle anything printable
+    // to stream can be used as index. However, in practice only integers
+    // and possibly strings will be used.
+
+    // Let's text integer as index.
+    EXPECT_EQ("subnet[123].pkt4-received",
+              StatsMgr::generateName("subnet", 123, "pkt4-received"));
+
+    // Lets' test string as index.
+    EXPECT_EQ("subnet[foo].pkt4-received",
+              StatsMgr::generateName("subnet", "foo", "pkt4-received"));
+}
+
+// Test checks if statistic-get handler is able to return specified statistic.
+TEST_F(StatsMgrTest, commandStatisticGet) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetHandler("statistic-get",
+                                                                   params);
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    std::string exp = "{ \"alpha\": [ [ 1234, \"" +
+        isc::util::clockToText(alpha->getInteger().second) + "\" ] ] }";
+
+    EXPECT_EQ("{ \"arguments\": " + exp + ", \"result\": 0 }", rsp->str());
+}
+
+// Test checks if statistic-get is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticGetNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetHandler("statistic-get",
+                                                                   ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticGetHandler("statistic-get", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticGetHandler("statistic-get", params);
+    EXPECT_EQ("{ \"arguments\": {  }, \"result\": 0 }", rsp->str());
+}
+
+// This test checks whether statistic-get-all command returns all statistics
+// correctly.
+TEST_F(StatsMgrTest, commandGetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Now get them. They're used to generate expected output
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string exp_str_beta = "[ [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string exp_str_gamma = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Check that all of them can be reported at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetAllHandler(
+        "statistic-get-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+
+    // Verifying this is a bit more involved, as we don't know whether the
+    // order would be preserved or not.
+    EXPECT_EQ(4, rep_all->size());
+    ASSERT_TRUE(rep_all->get("alpha"));
+    ASSERT_TRUE(rep_all->get("beta"));
+    ASSERT_TRUE(rep_all->get("delta"));
+    ASSERT_TRUE(rep_all->get("gamma"));
+    EXPECT_FALSE(rep_all->get("epsilon"));
+
+    EXPECT_EQ(exp_str_alpha, rep_all->get("alpha")->str());
+    EXPECT_EQ(exp_str_beta, rep_all->get("beta")->str());
+    EXPECT_EQ(exp_str_gamma, rep_all->get("gamma")->str());
+    EXPECT_EQ(exp_str_delta, rep_all->get("delta")->str());
+}
+
+// Test checks if statistic-reset handler is able to reset specified statistic.
+TEST_F(StatsMgrTest, commandStatisticReset) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    // Check that it was indeed reset
+    EXPECT_EQ(0, alpha->getInteger().first);
+}
+
+// Test checks if statistic-reset is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticResetNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticResetHandler("statistic-reset", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+// This test checks whether statistic-reset-all command really resets all
+// statistics correctly.
+TEST_F(StatsMgrTest, commandResetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Now get them. They're used to generate expected output
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string exp_str_beta = "[ [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string exp_str_gamma = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Check that all of them can be reset at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticResetAllHandler(
+        "statistic-reset-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+
+    // Check that they're indeed reset
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+    EXPECT_EQ(0.0f,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+}
+
+// Test checks if statistic-remove handler is able to remove a statistic.
+TEST_F(StatsMgrTest, commandStatisticRemove) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // It should be gone.
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// Test checks if statistic-remove is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticRemoveNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticRemoveHandler("statistic-remove", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+// This test checks whether statistic-remove-all command really resets all
+// statistics correctly.
+TEST_F(StatsMgrTest, commandRemoveAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Check that all of them can be reset at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticRemoveAllHandler(
+        "statistic-remove-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+    std::string exp = "\"Warning: statistic-remove-all command is deprecated.";
+    exp += " All statistics removed.\"";
+    EXPECT_EQ(exp, rep_all->str());
+
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("beta"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("gamma"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("delta"));
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// This test checks whether statistic-sample-age-set command really set
+// max_sample_age_ limit correctly.
+TEST_F(StatsMgrTest, commandSetMaxSampleAge) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    params->set("duration", Element::create(1245)); // minutes(20) + seconds(45)
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              minutes(20) + seconds(45));
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+}
+
+// Test checks if statistic-sample-age-set is able to handle:
+// - a request without parameters
+// - a request without duration parameter
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandSetMaxSampleAgeNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request without duration parameter
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request with missing statistic name
+    params = Element::createMap();
+    params->set("duration", Element::create(100));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 4: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+TEST_F(StatsMgrTest, commandSetMaxSampleAgeAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    ElementPtr params = Element::createMap();
+    params->set("duration", Element::create(3765)); // set duration to 3765 seconds
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check defaults
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), seconds(3765));
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 0);
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+}
+
+// This test checks whether statistic-sample-count-set command really set
+// max_sample_count_ limit correctly.
+TEST_F(StatsMgrTest, commandSetMaxSampleCount) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    params->set("max-samples", Element::create(15));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check if time limit was set properly and whether duration limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 15);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+}
+
+// Test checks if statistic-sample-count-set is able to handle:
+// - a request without parameters
+// - a request without max-samples parameter
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandSetMaxSampleCountNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request without max-samples parameter
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request with missing statistic name
+    params = Element::createMap();
+    params->set("max-samples", Element::create(10));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 4: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+TEST_F(StatsMgrTest, commandSetMaxSampleCountAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    ElementPtr params = Element::createMap();
+    params->set("max-samples", Element::create(200));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check default
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 200);
+
+    // check if count limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+}
+
+// Test checks if statistics-sample-count-set-all fails on zero.
+TEST_F(StatsMgrTest, commandSetMaxSampleCountAllZero) {
+    ElementPtr params = Element::createMap();
+    params->set("max-samples", Element::create(0));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+}
+
+}