Adding upstream version 2.4.1.upstream/2.4.1upstream

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

33 files changed, 5503 insertions, 0 deletions

diff --git a/src/lib/log/tests/Makefile.am b/src/lib/log/tests/Makefile.am
new file mode 100644
index 0000000..55240aa
--- /dev/null
+++ b/src/lib/log/tests/Makefile.am
@@ -0,0 +1,158 @@
+SUBDIRS = .
+
+# Define the flags used in each set of tests.
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES) $(GTEST_INCLUDES) $(LOG4CPLUS_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+AM_LDADD  =
+AM_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+AM_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+AM_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+AM_LDADD += $(LOG4CPLUS_LIBS) $(GTEST_LDADD)
+
+AM_LDFLAGS  =
+if USE_STATIC_LINK
+AM_LDFLAGS += -static
+endif
+
+CLEANFILES = *.gcno *.gcda *.lock
+
+EXTRA_DIST = log_test_messages.mes
+
+# Helper programs used in shell tests
+TEST_HELPERS = logger_example
+logger_example_SOURCES = logger_example.cc
+logger_example_CPPFLAGS = $(AM_CPPFLAGS)
+logger_example_CXXFLAGS = $(AM_CXXFLAGS)
+logger_example_LDADD = $(AM_LDADD)
+logger_example_LDFLAGS = $(AM_LDFLAGS)
+
+TEST_HELPERS += init_logger_test
+init_logger_test_SOURCES = init_logger_test.cc
+init_logger_test_CPPFLAGS = $(AM_CPPFLAGS)
+init_logger_test_CXXFLAGS = $(AM_CXXFLAGS)
+init_logger_test_LDADD = $(AM_LDADD)
+init_logger_test_LDFLAGS = $(AM_LDFLAGS)
+
+TEST_HELPERS += buffer_logger_test
+buffer_logger_test_SOURCES = buffer_logger_test.cc
+buffer_logger_test_CPPFLAGS = $(AM_CPPFLAGS)
+buffer_logger_test_CXXFLAGS = $(AM_CXXFLAGS)
+buffer_logger_test_LDADD = $(AM_LDADD)
+buffer_logger_test_LDFLAGS = $(AM_LDFLAGS)
+
+TEST_HELPERS += logger_lock_test
+logger_lock_test_SOURCES  = logger_lock_test.cc
+logger_lock_test_SOURCES += log_test_messages.cc log_test_messages.h
+logger_lock_test_CPPFLAGS = $(AM_CPPFLAGS)
+logger_lock_test_CXXFLAGS = $(AM_CXXFLAGS)
+logger_lock_test_LDADD = $(AM_LDADD)
+logger_lock_test_LDFLAGS = $(AM_LDFLAGS)
+
+# Don't install helper binaries.
+noinst_PROGRAMS = $(TEST_HELPERS)
+
+# Shell tests. These are principally tests where the global logging environment
+# is affected, and where the output needs to be compared with stored output
+# (where "cut" and "diff" are useful utilities).
+SHTESTS  =
+SHTESTS += buffer_logger_test.sh
+SHTESTS += console_test.sh
+SHTESTS += destination_test.sh
+SHTESTS += init_logger_test.sh
+SHTESTS += local_file_test.sh
+SHTESTS += logger_lock_test.sh
+SHTESTS += severity_test.sh
+
+# As with every file generated by ./configure, clean them up when running
+# "make distclean", but not on "make clean".
+DISTCLEANFILES = tempdir.h
+DISTCLEANFILES += $(SHTESTS)
+
+if HAVE_GTEST
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+# Set of unit tests for the general logging classes
+PROGRAM_TESTS = run_unittests
+run_unittests_SOURCES  = run_unittests.cc
+run_unittests_SOURCES += log_formatter_unittest.cc
+run_unittests_SOURCES += logger_level_impl_unittest.cc
+run_unittests_SOURCES += logger_level_unittest.cc
+run_unittests_SOURCES += logger_manager_unittest.cc
+run_unittests_SOURCES += logger_name_unittest.cc
+run_unittests_SOURCES += logger_support_unittest.cc
+run_unittests_SOURCES += logger_unittest.cc
+run_unittests_SOURCES += logger_specification_unittest.cc
+run_unittests_SOURCES += message_dictionary_unittest.cc
+run_unittests_SOURCES += message_reader_unittest.cc
+run_unittests_SOURCES += output_option_unittest.cc
+run_unittests_SOURCES += buffer_appender_unittest.cc
+run_unittests_SOURCES += log_test_messages.cc log_test_messages.h
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS)
+run_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+run_unittests_LDADD = $(AM_LDADD)
+run_unittests_LDFLAGS = $(AM_LDFLAGS)
+
+# logging initialization tests.  These are put in a separate program to
+# ensure that the initialization status at the start of each test is known,
+# and to prevent circumstances where the execution of one test affects the
+# starting conditions of the next.
+PROGRAM_TESTS += initializer_unittests_1
+initializer_unittests_1_SOURCES  = run_initializer_unittests.cc
+initializer_unittests_1_SOURCES += message_initializer_1_unittest.cc
+initializer_unittests_1_SOURCES += message_initializer_1a_unittest.cc
+initializer_unittests_1_CPPFLAGS = $(AM_CPPFLAGS)
+initializer_unittests_1_CXXFLAGS = $(AM_CXXFLAGS)
+initializer_unittests_1_LDADD = $(AM_LDADD)
+initializer_unittests_1_LDFLAGS = $(AM_LDFLAGS)
+
+# Run C++ tests on "make check".
+TESTS = $(PROGRAM_TESTS)
+
+# Run shell tests on "make check".
+check_SCRIPTS = $(SHTESTS)
+TESTS += $(SHTESTS)
+
+# Don't install test binaries.
+noinst_PROGRAMS += $(PROGRAM_TESTS)
+
+endif
+
+# Don't install shell tests.
+noinst_SCRIPTS = $(SHTESTS)
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f log_test_messages.h log_test_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: log_test_messages.h log_test_messages.cc
+	@echo Message files regenerated
+
+log_test_messages.h log_test_messages.cc: log_test_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/log/tests/log_test_messages.mes
+
+else
+
+messages log_test_messages.h log_test_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
diff --git a/src/lib/log/tests/Makefile.in b/src/lib/log/tests/Makefile.in
new file mode 100644
index 0000000..721a9e7
--- /dev/null
+++ b/src/lib/log/tests/Makefile.in
@@ -0,0 +1,1602 @@
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+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+# Define the flags used in each set of tests.
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+	$(BOOST_INCLUDES) $(GTEST_INCLUDES) $(LOG4CPLUS_INCLUDES)
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+	logger_lock_test
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+	log_test_messages.h
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+logger_lock_test_LDADD = $(AM_LDADD)
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+
+# Shell tests. These are principally tests where the global logging environment
+# is affected, and where the output needs to be compared with stored output
+# (where "cut" and "diff" are useful utilities).
+SHTESTS = buffer_logger_test.sh console_test.sh destination_test.sh \
+	init_logger_test.sh local_file_test.sh logger_lock_test.sh \
+	severity_test.sh
+
+# As with every file generated by ./configure, clean them up when running
+# "make distclean", but not on "make clean".
+DISTCLEANFILES = tempdir.h $(SHTESTS)
+@HAVE_GTEST_TRUE@TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+# Set of unit tests for the general logging classes
+
+# logging initialization tests.  These are put in a separate program to
+# ensure that the initialization status at the start of each test is known,
+# and to prevent circumstances where the execution of one test affects the
+# starting conditions of the next.
+@HAVE_GTEST_TRUE@PROGRAM_TESTS = run_unittests initializer_unittests_1
+@HAVE_GTEST_TRUE@run_unittests_SOURCES = run_unittests.cc \
+@HAVE_GTEST_TRUE@	log_formatter_unittest.cc \
+@HAVE_GTEST_TRUE@	logger_level_impl_unittest.cc \
+@HAVE_GTEST_TRUE@	logger_level_unittest.cc \
+@HAVE_GTEST_TRUE@	logger_manager_unittest.cc \
+@HAVE_GTEST_TRUE@	logger_name_unittest.cc \
+@HAVE_GTEST_TRUE@	logger_support_unittest.cc logger_unittest.cc \
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+@HAVE_GTEST_TRUE@	message_dictionary_unittest.cc \
+@HAVE_GTEST_TRUE@	message_reader_unittest.cc \
+@HAVE_GTEST_TRUE@	output_option_unittest.cc \
+@HAVE_GTEST_TRUE@	buffer_appender_unittest.cc \
+@HAVE_GTEST_TRUE@	log_test_messages.cc log_test_messages.h
+@HAVE_GTEST_TRUE@run_unittests_CPPFLAGS = $(AM_CPPFLAGS)
+@HAVE_GTEST_TRUE@run_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+@HAVE_GTEST_TRUE@run_unittests_LDADD = $(AM_LDADD)
+@HAVE_GTEST_TRUE@run_unittests_LDFLAGS = $(AM_LDFLAGS)
+@HAVE_GTEST_TRUE@initializer_unittests_1_SOURCES =  \
+@HAVE_GTEST_TRUE@	run_initializer_unittests.cc \
+@HAVE_GTEST_TRUE@	message_initializer_1_unittest.cc \
+@HAVE_GTEST_TRUE@	message_initializer_1a_unittest.cc
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+
+# Run shell tests on "make check".
+@HAVE_GTEST_TRUE@check_SCRIPTS = $(SHTESTS)
+
+# Don't install shell tests.
+noinst_SCRIPTS = $(SHTESTS)
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+.SUFFIXES: .cc .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib/log/tests/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib/log/tests/Makefile
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+	  *config.status*) \
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+console_test.sh: $(top_builddir)/config.status $(srcdir)/console_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+destination_test.sh: $(top_builddir)/config.status $(srcdir)/destination_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+init_logger_test.sh: $(top_builddir)/config.status $(srcdir)/init_logger_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+local_file_test.sh: $(top_builddir)/config.status $(srcdir)/local_file_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+logger_lock_test.sh: $(top_builddir)/config.status $(srcdir)/logger_lock_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+severity_test.sh: $(top_builddir)/config.status $(srcdir)/severity_test.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+tempdir.h: $(top_builddir)/config.status $(srcdir)/tempdir.h.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+
+clean-noinstPROGRAMS:
+	@list='$(noinst_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+buffer_logger_test$(EXEEXT): $(buffer_logger_test_OBJECTS) $(buffer_logger_test_DEPENDENCIES) $(EXTRA_buffer_logger_test_DEPENDENCIES) 
+	@rm -f buffer_logger_test$(EXEEXT)
+	$(AM_V_CXXLD)$(buffer_logger_test_LINK) $(buffer_logger_test_OBJECTS) $(buffer_logger_test_LDADD) $(LIBS)
+
+init_logger_test$(EXEEXT): $(init_logger_test_OBJECTS) $(init_logger_test_DEPENDENCIES) $(EXTRA_init_logger_test_DEPENDENCIES) 
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diff --git a/src/lib/log/tests/buffer_appender_unittest.cc b/src/lib/log/tests/buffer_appender_unittest.cc
new file mode 100644
index 0000000..f52d833
--- /dev/null
+++ b/src/lib/log/tests/buffer_appender_unittest.cc
@@ -0,0 +1,138 @@
+// Copyright (C) 2012-2015 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>
+
+#include <log/macros.h>
+#include <log/logger_support.h>
+#include <log/log_messages.h>
+#include <log/buffer_appender_impl.h>
+
+#include <log4cplus/loggingmacros.h>
+#include <log4cplus/logger.h>
+#include <log4cplus/nullappender.h>
+#include <log4cplus/spi/loggingevent.h>
+
+using namespace isc::log;
+using namespace isc::log::internal;
+
+namespace isc {
+namespace log {
+
+/// \brief Specialized test class
+///
+/// In order to test append() somewhat directly, this
+/// class implements one more method (addEvent)
+class TestBufferAppender : public BufferAppender {
+public:
+    void addEvent(const log4cplus::spi::InternalLoggingEvent& event) {
+        append(event);
+    }
+};
+
+class BufferAppenderTest : public ::testing::Test {
+protected:
+    BufferAppenderTest() : buffer_appender1(new TestBufferAppender()),
+                      appender1(buffer_appender1),
+                      buffer_appender2(new TestBufferAppender()),
+                      appender2(buffer_appender2),
+                      logger(log4cplus::Logger::getInstance("buffer"))
+    {
+        logger.setLogLevel(log4cplus::TRACE_LOG_LEVEL);
+    }
+
+    ~BufferAppenderTest() {
+        // If any log messages are left, we don't care, get rid of them,
+        // by flushing them to a null appender
+        // Given the 'messages should not get lost' approach of the logging
+        // system, not flushing them to a null appender would cause them
+        // to be dumped to stdout as the test is destroyed, making
+        // unnecessarily messy test output.
+        log4cplus::SharedAppenderPtr null_appender(
+            new log4cplus::NullAppender());
+        logger.removeAllAppenders();
+        logger.addAppender(null_appender);
+        buffer_appender1->flush();
+        buffer_appender2->flush();
+    }
+
+    TestBufferAppender* buffer_appender1;
+    log4cplus::SharedAppenderPtr appender1;
+    TestBufferAppender* buffer_appender2;
+    log4cplus::SharedAppenderPtr appender2;
+    log4cplus::Logger logger;
+};
+
+// Test that log events are indeed stored, and that they are
+// flushed to the new appenders of their logger
+TEST_F(BufferAppenderTest, flush) {
+    ASSERT_EQ(0, buffer_appender1->getBufferSize());
+    ASSERT_EQ(0, buffer_appender2->getBufferSize());
+
+    // Create a Logger, log a few messages with the first appender
+    logger.addAppender(appender1);
+    LOG4CPLUS_INFO(logger, "Foo");
+    ASSERT_EQ(1, buffer_appender1->getBufferSize());
+    LOG4CPLUS_INFO(logger, "Foo");
+    ASSERT_EQ(2, buffer_appender1->getBufferSize());
+    LOG4CPLUS_INFO(logger, "Foo");
+    ASSERT_EQ(3, buffer_appender1->getBufferSize());
+
+    // Second buffer should still be empty
+    ASSERT_EQ(0, buffer_appender2->getBufferSize());
+
+    // Replace the appender by the second one, and call flush;
+    // this should cause all events to be moved to the second buffer
+    logger.removeAllAppenders();
+    logger.addAppender(appender2);
+    buffer_appender1->flush();
+    ASSERT_EQ(0, buffer_appender1->getBufferSize());
+    ASSERT_EQ(3, buffer_appender2->getBufferSize());
+}
+
+// Once flushed, logging new messages with the same buffer should fail
+TEST_F(BufferAppenderTest, addAfterFlush) {
+    logger.addAppender(appender1);
+    buffer_appender1->flush();
+    EXPECT_THROW(LOG4CPLUS_INFO(logger, "Foo"), LogBufferAddAfterFlush);
+    // It should not have been added
+    ASSERT_EQ(0, buffer_appender1->getBufferSize());
+
+    // But logging should work again as long as a different buffer is used
+    logger.removeAllAppenders();
+    logger.addAppender(appender2);
+    LOG4CPLUS_INFO(logger, "Foo");
+    ASSERT_EQ(1, buffer_appender2->getBufferSize());
+}
+
+TEST_F(BufferAppenderTest, addDirectly) {
+    // A few direct calls
+    log4cplus::spi::InternalLoggingEvent event("buffer",
+                                               log4cplus::INFO_LOG_LEVEL,
+                                               "Bar", "file", 123);
+    buffer_appender1->addEvent(event);
+    ASSERT_EQ(1, buffer_appender1->getBufferSize());
+
+    // Do one from a smaller scope to make sure destruction doesn't harm
+    {
+        log4cplus::spi::InternalLoggingEvent event2("buffer",
+                                                    log4cplus::INFO_LOG_LEVEL,
+                                                    "Bar", "file", 123);
+        buffer_appender1->addEvent(event2);
+    }
+    ASSERT_EQ(2, buffer_appender1->getBufferSize());
+
+    // And flush them to the next
+    logger.removeAllAppenders();
+    logger.addAppender(appender2);
+    buffer_appender1->flush();
+    ASSERT_EQ(0, buffer_appender1->getBufferSize());
+    ASSERT_EQ(2, buffer_appender2->getBufferSize());
+}
+
+}
+}
diff --git a/src/lib/log/tests/buffer_logger_test.cc b/src/lib/log/tests/buffer_logger_test.cc
new file mode 100644
index 0000000..956e2f1
--- /dev/null
+++ b/src/lib/log/tests/buffer_logger_test.cc
@@ -0,0 +1,66 @@
+// Copyright (C) 2012-2015 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 <log/macros.h>
+#include <log/logger_support.h>
+#include <log/logger_manager.h>
+#include <log/log_messages.h>
+#include <log/interprocess/interprocess_sync_null.h>
+
+using namespace isc::log;
+
+namespace {
+void usage() {
+    std::cout << "Usage: buffer_logger_test [-n]" << std::endl;
+}
+} // end unnamed namespace
+
+/// \brief Test InitLogger
+///
+/// A program used in testing the logger that initializes logging with
+/// buffering enabled, so that initial log messages are not immediately
+/// logged, but are not lost (they should be logged the moment process()
+/// is called.
+///
+/// If -n is given as an argument, process() is never called. In this
+/// case, upon exit, all leftover log messages should be printed to
+/// stdout, but without normal logging additions (such as time and
+/// logger name)
+int
+main(int argc, char** argv) {
+    bool do_process = true;
+    int opt;
+    while ((opt = getopt(argc, argv, "n")) != -1) {
+        switch (opt) {
+        case 'n':
+            do_process = false;
+            break;
+        default:
+            usage();
+            return (1);
+        }
+    }
+
+    // Note, level is INFO, so DEBUG should normally not show
+    // up. Unless process is never called (at which point it
+    // will end up in the dump at the end).
+    initLogger("buffertest", isc::log::INFO, 0, NULL, true);
+    Logger logger("log");
+    // No need for file interprocess locking in this test
+    logger.setInterprocessSync(
+        new isc::log::interprocess::InterprocessSyncNull("logger"));
+    LOG_INFO(logger, LOG_BAD_SEVERITY).arg("info");
+    LOG_DEBUG(logger, 50, LOG_BAD_DESTINATION).arg("debug-50");
+    LOG_INFO(logger, LOG_BAD_SEVERITY).arg("info");
+    // process should cause them to be logged
+    if (do_process) {
+        LoggerManager logger_manager;
+        logger_manager.process();
+    }
+    return (0);
+}
diff --git a/src/lib/log/tests/buffer_logger_test.sh.in b/src/lib/log/tests/buffer_logger_test.sh.in
new file mode 100644
index 0000000..975df97
--- /dev/null
+++ b/src/lib/log/tests/buffer_logger_test.sh.in
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+# Copyright (C) 2012-2020 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/.
+
+# Checks that the initLogger() call uses for unit tests respects the setting of
+# the buffer value
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/buffer_logger_test_tempfile_$$"
+
+printf 'Checking that buffer initialization works:\n'
+
+test_start 'buffer-logger.buffer-including-process()-call'
+cat > $tempfile << .
+INFO  [buffertest.log] LOG_BAD_SEVERITY unrecognized log severity: info
+INFO  [buffertest.log] LOG_BAD_SEVERITY unrecognized log severity: info
+.
+./buffer_logger_test 2>&1 | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish 0
+
+test_start 'buffer-logger.buffer-excluding-process()-call'
+cat > $tempfile << .
+INFO [buffertest.log]: LOG_BAD_SEVERITY unrecognized log severity: info
+DEBUG [buffertest.log]: LOG_BAD_DESTINATION unrecognized log destination: debug-50
+INFO [buffertest.log]: LOG_BAD_SEVERITY unrecognized log severity: info
+.
+./buffer_logger_test -n 2>&1 | diff $tempfile -
+test_finish 0
+
+# Tidy up.
+rm -f $tempfile
diff --git a/src/lib/log/tests/console_test.sh.in b/src/lib/log/tests/console_test.sh.in
new file mode 100644
index 0000000..7c5ebeb
--- /dev/null
+++ b/src/lib/log/tests/console_test.sh.in
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+# Copyright (C) 2011-2020 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/.
+
+# The logger supports the idea of a "console" logger than logs to either stdout
+# or stderr.  This test checks that both these options work.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/console_test_tempfile_$$"
+
+# Look at tempfile and check that the count equals the expected count
+passfail() {
+    count=$(wc -l $tempfile | awk '{print $1}')
+    if [ "${count}" -eq "${1}" ]; then
+        test_finish 0
+    else
+        test_finish 1
+    fi
+}
+
+test_start 'console-output.stdout'
+rm -f $tempfile
+./logger_example -c stdout -s error 1> $tempfile 2> /dev/null
+passfail 4
+
+test_start 'console-output.stdout-not-stderr'
+rm -f $tempfile
+./logger_example -c stdout -s error 1> /dev/null 2> $tempfile
+passfail 0
+
+test_start 'console-output.stderr'
+rm -f $tempfile
+./logger_example -c stderr -s error 1> /dev/null 2> $tempfile
+passfail 4
+
+test_start 'console-output.stderr-not-stdout'
+rm -f $tempfile
+./logger_example -c stderr -s error 1> $tempfile 2> /dev/null
+passfail 0
+
+# Tidy up
+rm -f $tempfile
diff --git a/src/lib/log/tests/destination_test.sh.in b/src/lib/log/tests/destination_test.sh.in
new file mode 100644
index 0000000..86fc415
--- /dev/null
+++ b/src/lib/log/tests/destination_test.sh.in
@@ -0,0 +1,85 @@
+#!/bin/sh
+
+# Copyright (C) 2011-2020 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Checks that the logger will route messages to the chosen destination.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/destination_test_tempfile_$$"
+destfile1_tmp="@abs_builddir@/destination_test_destfile_1_tmp_$$"
+destfile2_tmp="@abs_builddir@/destination_test_destfile_2_tmp_$$"
+destfile1="@abs_builddir@/destination_test_destfile_1_$$"
+destfile2="@abs_builddir@/destination_test_destfile_2_$$"
+
+printf '1. One logger, multiple destinations:\n'
+
+cat > $tempfile << .
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+.
+rm -f $destfile1 $destfile2
+./logger_example -s error -f $destfile1_tmp -f $destfile2_tmp
+
+# strip the pids and thread ids
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile1_tmp > $destfile1
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile2_tmp > $destfile2
+# strip the thread ids
+
+test_start 'logger-destination.one-logger-file-1'
+cut -d' ' -f3- $destfile1 | diff $tempfile -
+test_finish $?
+
+test_start 'logger-destination.one-logger-file-2'
+cut -d' ' -f3- $destfile2 | diff $tempfile -
+test_finish $?
+
+# Tidy up.
+rm -f $tempfile $destfile1_tmp $destfile2_tmp $destfile1 $destfile2
+
+printf '2. Two loggers, different destinations and severities:\n'
+rm -f $destfile1 $destfile2
+./logger_example -l example -s info -f $destfile1_tmp -l alpha -s warn -f $destfile2_tmp
+
+# strip the pids and thread ids
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile1_tmp > $destfile1
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile2_tmp > $destfile2
+
+# All output for example and example.beta should have gone to destfile1.
+# Output for example.alpha should have done to destfile2.
+
+test_start 'logger-destination.multiples-loggers-file-1'
+cat > $tempfile << .
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+WARN  [example] LOG_BAD_STREAM bad log console output stream: example
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+WARN  [example.beta] LOG_BAD_STREAM bad log console output stream: beta_warn
+INFO  [example.beta] LOG_READ_ERROR error reading from message file beta: info
+.
+cut -d' ' -f3- $destfile1 | diff $tempfile -
+test_finish $?
+
+test_start 'logger-destination.multiples-loggers-file-2'
+cat > $tempfile << .
+WARN  [example.alpha] LOG_READ_ERROR error reading from message file a.txt: dummy reason
+.
+cut -d' ' -f3- $destfile2 | diff $tempfile -
+test_finish $?
+
+# Tidy up.
+rm -f $tempfile $destfile1_tmp $destfile2_tmp $destfile1 $destfile2
diff --git a/src/lib/log/tests/init_logger_test.cc b/src/lib/log/tests/init_logger_test.cc
new file mode 100644
index 0000000..02862fd
--- /dev/null
+++ b/src/lib/log/tests/init_logger_test.cc
@@ -0,0 +1,36 @@
+// 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 <log/macros.h>
+#include <log/logger_support.h>
+#include <log/log_messages.h>
+
+using namespace isc::log;
+
+/// \brief Test InitLogger
+///
+/// A program used in testing the logger that initializes logging using
+/// initLogger(), then outputs several messages at different severities and
+/// debug levels.  An external script sets the environment variables and checks
+/// that they have the desired effect.
+
+int
+main(int, char**) {
+    initLogger();
+    Logger logger("log");
+
+    LOG_DEBUG(logger, 0, LOG_BAD_DESTINATION).arg("debug-0");
+    LOG_DEBUG(logger, 50, LOG_BAD_DESTINATION).arg("debug-50");
+    LOG_DEBUG(logger, 99, LOG_BAD_DESTINATION).arg("debug-99");
+    LOG_INFO(logger, LOG_BAD_SEVERITY).arg("info");
+    LOG_WARN(logger, LOG_BAD_STREAM).arg("warn");
+    LOG_ERROR(logger, LOG_DUPLICATE_MESSAGE_ID).arg("error");
+    LOG_FATAL(logger, LOG_NO_MESSAGE_ID).arg("fatal");
+
+    return (0);
+}
diff --git a/src/lib/log/tests/init_logger_test.sh.in b/src/lib/log/tests/init_logger_test.sh.in
new file mode 100644
index 0000000..348008d
--- /dev/null
+++ b/src/lib/log/tests/init_logger_test.sh.in
@@ -0,0 +1,96 @@
+#!/bin/sh
+
+# Copyright (C) 2011-2020 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/.
+
+# Checks that the initLogger() call uses for unit tests respects the setting of
+# the environment variables.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/init_logger_test_tempfile_$$"
+destfile_tmp="@abs_builddir@/init_logger_test_destfile_tmp_$$"
+destfile="@abs_builddir@/init_logger_test_destfile_$$"
+
+printf '1. Checking that KEA_LOGGER_SEVERITY/KEA_LOGGER_DBGLEVEL work:\n'
+
+test_start 'init-logger.severity=DEBUG,dbglevel=99'
+cat > $tempfile << .
+DEBUG [kea.log] LOG_BAD_DESTINATION unrecognized log destination: debug-0
+DEBUG [kea.log] LOG_BAD_DESTINATION unrecognized log destination: debug-50
+DEBUG [kea.log] LOG_BAD_DESTINATION unrecognized log destination: debug-99
+INFO  [kea.log] LOG_BAD_SEVERITY unrecognized log severity: info
+WARN  [kea.log] LOG_BAD_STREAM bad log console output stream: warn
+ERROR [kea.log] LOG_DUPLICATE_MESSAGE_ID duplicate message ID (error) in compiled code
+FATAL [kea.log] LOG_NO_MESSAGE_ID line fatal: message definition line found without a message ID
+.
+KEA_LOGGER_DESTINATION=stdout KEA_LOGGER_SEVERITY=DEBUG KEA_LOGGER_DBGLEVEL=99 ./init_logger_test | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+test_start 'init-logger.severity=DEBUG,dbglevel=50'
+cat > $tempfile << .
+DEBUG [kea.log] LOG_BAD_DESTINATION unrecognized log destination: debug-0
+DEBUG [kea.log] LOG_BAD_DESTINATION unrecognized log destination: debug-50
+INFO  [kea.log] LOG_BAD_SEVERITY unrecognized log severity: info
+WARN  [kea.log] LOG_BAD_STREAM bad log console output stream: warn
+ERROR [kea.log] LOG_DUPLICATE_MESSAGE_ID duplicate message ID (error) in compiled code
+FATAL [kea.log] LOG_NO_MESSAGE_ID line fatal: message definition line found without a message ID
+.
+KEA_LOGGER_DESTINATION=stdout KEA_LOGGER_SEVERITY=DEBUG KEA_LOGGER_DBGLEVEL=50 ./init_logger_test | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+test_start 'init-logger.severity=WARN'
+cat > $tempfile << .
+WARN  [kea.log] LOG_BAD_STREAM bad log console output stream: warn
+ERROR [kea.log] LOG_DUPLICATE_MESSAGE_ID duplicate message ID (error) in compiled code
+FATAL [kea.log] LOG_NO_MESSAGE_ID line fatal: message definition line found without a message ID
+.
+KEA_LOGGER_DESTINATION=stdout KEA_LOGGER_SEVERITY=WARN ./init_logger_test | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+printf '2. Checking that KEA_LOGGER_DESTINATION works:\n'
+
+test_start 'init-logger.stdout'
+cat > $tempfile << .
+FATAL [kea.log] LOG_NO_MESSAGE_ID line fatal: message definition line found without a message ID
+.
+rm -f $destfile_tmp $destfile
+KEA_LOGGER_SEVERITY=FATAL KEA_LOGGER_DESTINATION=stdout ./init_logger_test 1> $destfile_tmp
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile_tmp > $destfile
+cut -d' ' -f3- $destfile | diff $tempfile -
+test_finish $?
+
+test_start 'init-logger.stderr'
+rm -f $destfile_tmp $destfile
+KEA_LOGGER_SEVERITY=FATAL KEA_LOGGER_DESTINATION=stderr ./init_logger_test 2> $destfile_tmp
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile_tmp > $destfile
+cut -d' ' -f3- $destfile | diff $tempfile -
+test_finish $?
+
+test_start 'init-logger.file'
+rm -f $destfile_tmp $destfile
+KEA_LOGGER_SEVERITY=FATAL KEA_LOGGER_DESTINATION=$destfile_tmp ./init_logger_test
+sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' < $destfile_tmp > $destfile
+cut -d' ' -f3- $destfile | diff $tempfile -
+test_finish $?
+
+# Note: can't automatically test syslog output.
+
+# Tidy up.
+rm -f $tempfile $destfile_tmp $destfile
diff --git a/src/lib/log/tests/local_file_test.sh.in b/src/lib/log/tests/local_file_test.sh.in
new file mode 100644
index 0000000..c1e7a53
--- /dev/null
+++ b/src/lib/log/tests/local_file_test.sh.in
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+# Copyright (C) 2011-2020 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/.
+
+# Checks that a local message file can override the definitions in the message
+# dictionary.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+localmes="@abs_builddir@/localdef_mes_$$"
+tempfile="@abs_builddir@/run_time_init_test_tempfile_$$"
+
+# Create the local message file for testing
+
+cat > $localmes << .
+% LOG_NOTHERE this message is not in the global dictionary
+% LOG_READ_ERROR replacement read error, parameters: '%1' and '%2'
+% LOG_READING_LOCAL_FILE replacement read local message file, parameter is '%1'
+.
+
+test_start 'local-file.local-message-replacement'
+cat > $tempfile << .
+WARN  [example.log] LOG_NO_SUCH_MESSAGE could not replace message text for 'LOG_NOTHERE': no such message
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE replacement read local message file, parameter is 'dummy/file'
+WARN  [example] LOG_BAD_STREAM bad log console output stream: example
+WARN  [example.alpha] LOG_READ_ERROR replacement read error, parameters: 'a.txt' and 'dummy reason'
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+WARN  [example.beta] LOG_BAD_STREAM bad log console output stream: beta_warn
+.
+./logger_example -c stdout -s warn $localmes | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+test_start 'local-file.read-error-reporting'
+cat > $tempfile << .
+ERROR [example.log] LOG_INPUT_OPEN_FAIL unable to open message file $localmes for input: No such file or directory
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+WARN  [example] LOG_BAD_STREAM bad log console output stream: example
+WARN  [example.alpha] LOG_READ_ERROR error reading from message file a.txt: dummy reason
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+WARN  [example.beta] LOG_BAD_STREAM bad log console output stream: beta_warn
+.
+rm -f $localmes
+./logger_example -c stdout -s warn $localmes | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+# Tidy up.
+rm -f $tempfile
diff --git a/src/lib/log/tests/log_formatter_unittest.cc b/src/lib/log/tests/log_formatter_unittest.cc
new file mode 100644
index 0000000..4bd0405
--- /dev/null
+++ b/src/lib/log/tests/log_formatter_unittest.cc
@@ -0,0 +1,181 @@
+// Copyright (C) 2011-2022 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 <gtest/gtest.h>
+
+#include <util/unittests/resource.h>
+#include <util/unittests/check_valgrind.h>
+
+#include <log/log_formatter.h>
+#include <log/logger_level.h>
+
+#include <vector>
+#include <string>
+
+using namespace std;
+
+namespace {
+
+class FormatterTest : public ::testing::Test {
+protected:
+    typedef pair<isc::log::Severity, string> Output;
+    typedef isc::log::Formatter<FormatterTest> Formatter;
+    vector<Output> outputs;
+public:
+    void output(const isc::log::Severity& prefix, const string& message) {
+        outputs.push_back(Output(prefix, message));
+    }
+    // Just shortcut for new string
+    boost::shared_ptr<string> s(const char* text) {
+        return (boost::make_shared<string>(text));
+    }
+};
+
+// Create an inactive formatter and check it doesn't produce any output
+TEST_F(FormatterTest, inactive) {
+    Formatter();
+    EXPECT_EQ(0, outputs.size());
+}
+
+// Create an active formatter and check it produces output. Does no arg
+// substitution yet
+TEST_F(FormatterTest, active) {
+    Formatter(isc::log::INFO, s("Text of message"), this);
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("Text of message", outputs[0].second);
+}
+
+// No output even when we have an arg on the inactive formatter
+TEST_F(FormatterTest, inactiveArg) {
+    Formatter().arg("Hello");
+    EXPECT_EQ(0, outputs.size());
+}
+
+// Create an active formatter and replace a placeholder with string
+TEST_F(FormatterTest, stringArg) {
+    {
+        SCOPED_TRACE("C++ string");
+        Formatter(isc::log::INFO, s("Hello %1"), this).arg(string("World"));
+        ASSERT_EQ(1, outputs.size());
+        EXPECT_EQ(isc::log::INFO, outputs[0].first);
+        EXPECT_EQ("Hello World", outputs[0].second);
+    }
+    {
+        SCOPED_TRACE("C++ string");
+        Formatter(isc::log::INFO, s("Hello %1"), this).arg(string("Internet"));
+        ASSERT_EQ(2, outputs.size());
+        EXPECT_EQ(isc::log::INFO, outputs[1].first);
+        EXPECT_EQ("Hello Internet", outputs[1].second);
+    }
+}
+
+// Test the .deactivate() method
+TEST_F(FormatterTest, deactivate) {
+    Formatter(isc::log::INFO, s("Text of message"), this).deactivate();
+    // If there was no .deactivate, it should have output it.
+    // But not now.
+    ASSERT_EQ(0, outputs.size());
+}
+
+// Can convert to string
+TEST_F(FormatterTest, intArg) {
+    Formatter(isc::log::INFO, s("The answer is %1"), this).arg(42);
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("The answer is 42", outputs[0].second);
+}
+
+// Can use multiple arguments at different places
+TEST_F(FormatterTest, multiArg) {
+    Formatter(isc::log::INFO, s("The %2 are %1"), this).arg("switched").
+        arg("arguments");
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("The arguments are switched", outputs[0].second);
+}
+
+#ifdef ENABLE_LOGGER_CHECKS
+
+TEST_F(FormatterTest, mismatchedPlaceholders) {
+    // Throws MismatchedPlaceholders exception if the placeholder is missing
+    // for a supplied argument.
+    EXPECT_THROW(Formatter(isc::log::INFO, s("Missing the second %1"), this).
+                 arg("argument").arg("missing"),
+                 isc::log::MismatchedPlaceholders);
+
+#ifdef EXPECT_DEATH
+    // Likewise, if there's a redundant placeholder (or missing argument), the
+    // check detects it and aborts the program.  Due to the restriction of the
+    // current implementation, it doesn't throw.
+    if (!isc::util::unittests::runningOnValgrind()) {
+        EXPECT_DEATH({
+            isc::util::unittests::dontCreateCoreDumps();
+            Formatter(isc::log::INFO, s("Too many arguments in %1 %2"), this).
+                arg("only one");
+        }, ".*");
+    }
+#endif /* EXPECT_DEATH */
+    // Mixed case of above two: the exception will be thrown due to the missing
+    // placeholder. The other check is disabled due to that.
+    EXPECT_THROW(Formatter(isc::log::INFO, s("Missing the first %2"), this).
+                 arg("missing").arg("argument"),
+                 isc::log::MismatchedPlaceholders);
+}
+
+#else
+
+// If logger checks are not enabled, nothing is thrown
+TEST_F(FormatterTest, mismatchedPlaceholders) {
+    Formatter(isc::log::INFO, s("Missing the second %1"), this).
+        arg("argument").arg("missing");
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("Missing the second argument "
+              "@@Missing logger placeholder '%2' for value 'missing'@@",
+              outputs[0].second);
+
+    EXPECT_NO_THROW(Formatter(isc::log::INFO,
+                              s("Too many arguments in %1 %2"), this).
+                    arg("only one"));
+    ASSERT_EQ(2, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[1].first);
+    EXPECT_EQ("Too many arguments in only one %2 "
+              "@@Excess logger placeholder '%2' still exists@@",
+              outputs[1].second);
+
+    EXPECT_NO_THROW(Formatter(isc::log::INFO, s("Missing the first %2"), this).
+                    arg("missing").arg("argument"));
+    ASSERT_EQ(3, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[2].first);
+    EXPECT_EQ("Missing the first argument "
+              "@@Missing logger placeholder '%1' for value 'missing'@@",
+              outputs[2].second);
+}
+
+#endif /* ENABLE_LOGGER_CHECKS */
+
+// Can replace multiple placeholders
+TEST_F(FormatterTest, multiPlaceholder) {
+    Formatter(isc::log::INFO, s("The %1 is the %1"), this).
+        arg("first rule of tautology club");
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("The first rule of tautology club is "
+              "the first rule of tautology club", outputs[0].second);
+}
+
+// Test we can cope with replacement containing the placeholder
+TEST_F(FormatterTest, noRecurse) {
+    // If we recurse, this will probably eat all the memory and crash
+    Formatter(isc::log::INFO, s("%1"), this).arg("%1 %1");
+    ASSERT_EQ(1, outputs.size());
+    EXPECT_EQ(isc::log::INFO, outputs[0].first);
+    EXPECT_EQ("%1 %1", outputs[0].second);
+}
+
+}
diff --git a/src/lib/log/tests/log_test_messages.cc b/src/lib/log/tests/log_test_messages.cc
new file mode 100644
index 0000000..5cb25ad
--- /dev/null
+++ b/src/lib/log/tests/log_test_messages.cc
@@ -0,0 +1,25 @@
+// File created from ../../../../src/lib/log/tests/log_test_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace log {
+
+extern const isc::log::MessageID LOG_LOCK_TEST_MESSAGE = "LOG_LOCK_TEST_MESSAGE";
+
+} // namespace log
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "LOG_LOCK_TEST_MESSAGE", "this is a test message.",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/lib/log/tests/log_test_messages.h b/src/lib/log/tests/log_test_messages.h
new file mode 100644
index 0000000..96553f5
--- /dev/null
+++ b/src/lib/log/tests/log_test_messages.h
@@ -0,0 +1,16 @@
+// File created from ../../../../src/lib/log/tests/log_test_messages.mes
+
+#ifndef LOG_TEST_MESSAGES_H
+#define LOG_TEST_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace log {
+
+extern const isc::log::MessageID LOG_LOCK_TEST_MESSAGE;
+
+} // namespace log
+} // namespace isc
+
+#endif // LOG_TEST_MESSAGES_H
diff --git a/src/lib/log/tests/log_test_messages.mes b/src/lib/log/tests/log_test_messages.mes
new file mode 100644
index 0000000..f7bee43
--- /dev/null
+++ b/src/lib/log/tests/log_test_messages.mes
@@ -0,0 +1,18 @@
+# Copyright (C) 2012-2015 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/.
+
+# \brief Message Utility Message File
+#
+# This is the source of the set of messages generated by the message and
+# logging components.  The associated .h and .cc files are created by hand from
+# this file though and are not built during the build process; this is to avoid
+# the chicken-and-egg situation where we need the files to build the message
+# compiler, yet we need the compiler to build the files.
+
+$NAMESPACE isc::log
+
+% LOG_LOCK_TEST_MESSAGE this is a test message.
+This is a log message used in testing.
diff --git a/src/lib/log/tests/logger_example.cc b/src/lib/log/tests/logger_example.cc
new file mode 100644
index 0000000..ff3d512
--- /dev/null
+++ b/src/lib/log/tests/logger_example.cc
@@ -0,0 +1,306 @@
+// Copyright (C) 2011-2020 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/.
+
+/// \brief Example Program
+///
+/// Simple example program showing how to use the logger.  The various
+/// command-line options let most aspects of the logger be exercised, so
+/// making this a useful tool for testing.
+///
+/// See the usage() method for details of use.
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <boost/lexical_cast.hpp>
+
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <util/strutil.h>
+
+#include <log/logger.h>
+#include <log/logger_level.h>
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_specification.h>
+#include <log/macros.h>
+
+// Include a set of message definitions.
+#include <log/log_messages.h>
+#include <log/interprocess/interprocess_sync_null.h>
+
+using namespace isc::log;
+using namespace std;
+using isc::log::interprocess::InterprocessSyncNull;
+
+// Print usage information
+
+void usage() {
+    cout <<
+"logger_support_test [-h | [logger_spec] [[logger_spec]...]]\n"
+"\n"
+"     -h            Print this message and exit\n"
+"\n"
+"The rest of the command line comprises the set of logger specifications.\n"
+"Each specification is of the form:\n"
+"\n"
+"    -l logger  [-s severity] [-d dbglevel] output_spec] [[output_spec] ...\n"
+"\n"
+"where:\n"
+"\n"
+"    -l logger      Give the name of the logger to which the following\n"
+"                   output specifications will apply.\n"
+"\n"
+"Each logger is followed by the indication of the severity it is logging\n"
+"and, if applicable, its debug level:\n"
+"\n"
+"   -d dbglevel     Debug level.  Only interpreted if the severity is 'debug'\n"
+"                   this is a number between 0 and 99.\n"
+"   -s severity     Set the severity of messages output.  'severity' is one\n"
+"                   of 'debug', 'info', 'warn', 'error', 'fatal', the default\n"
+"                   being 'info'.\n"
+"\n"
+"The output specifications - there may be more than one per logger - detail\n"
+"the output streams attached to the logger.  These are of the form:\n"
+"\n"
+"   -c stream | -f file [-m maxver] [-z maxsize] | -y facility\n"
+"\n"
+"These are:\n"
+"\n"
+"   -c stream       Send output to the console.  'stream' is one of 'stdout'\n"
+"                   of 'stderr'.\n"
+"   -f file         Send output to specified file, appending to existing file\n"
+"                   if one exists.\n"
+"   -y facility     Send output to the syslog file with the given facility\n"
+"                   name (e.g. local1, cron etc.)\n"
+"\n"
+"The following can be specified for the file logger:\n"
+"\n"
+"   -m maxver       If file rolling is selected (by the maximum file size being\n"
+"                   non-zero), the maximum number of versions to keep (defaults\n"
+"                   to 0)\n"
+"   -z maxsize      Maximum size of the file before the file is closed and a\n"
+"                   new one opened.  The default of 0 means no maximum size.\n"
+"\n"
+"If none of -c, -f or -y is given, by default, output is sent to stdout.  If no\n"
+"logger is specified, the default is the program's root logger ('example').\n";
+
+}
+
+
+// The program sets the attributes on the root logger and logs a set of
+// messages.  Looking at the output determines whether the program worked.
+
+int main(int argc, char** argv) {
+    const char* ROOT_NAME = "example";
+
+    bool                sw_found = false;   // Set true if switch found
+    bool                c_found = false;    // Set true if "-c" found
+    bool                f_found = false;    // Set true if "-f" found
+    bool                y_found = false;    // Set true if "-y" found
+    int                 option;             // For getopt() processing
+    OutputOption        def_opt;            // Default output option - used
+                                            //    for initialization
+    LoggerSpecification cur_spec(ROOT_NAME);// Current specification
+    OutputOption        cur_opt;            // Current output option
+    vector<LoggerSpecification> loggers;    // Set of logger specifications
+    std::string                 severity;   // Severity set for logger
+
+    // Initialize logging system - set the root logger name.
+    LoggerManager manager;
+    manager.init(ROOT_NAME);
+
+    // In the parsing loop that follows, the construction of the logging
+    // specification is always "one behind".  In other words, the parsing of
+    // command-line options updates the current logging specification/output
+    // options.  When the flag indicating a new logger or output specification
+    // is encountered, the previous one is added to the list.
+    //
+    // One complication is that there is deemed to be a default active when
+    // the parsing starts (console output for the Kea root logger).  This
+    // is included in the logging specifications UNLESS the first switch on
+    // the command line is a "-l" flag starting a new logger.  To track this,
+    // the "sw_found" flag is set when a switch is completely processed. The
+    // processing of "-l" will only add information for a previous logger to
+    // the list if this flag is set.
+    while ((option = getopt(argc, argv, "hc:d:f:l:m:s:y:z:")) != -1) {
+        switch (option) {
+        case 'c':   // Console output
+            // New output spec.  If one was currently active, add it to the
+            // list and reset the current output option to the defaults.
+            if (c_found || f_found || y_found) {
+                cur_spec.addOutputOption(cur_opt);
+                cur_opt = def_opt;
+                f_found = y_found = false;
+            }
+
+            // Set the output option for this switch.
+            c_found = true;
+            cur_opt.destination = OutputOption::DEST_CONSOLE;
+            if (strcmp(optarg, "stdout") == 0) {
+                cur_opt.stream = OutputOption::STR_STDOUT;
+
+            } else if (strcmp(optarg, "stderr") == 0) {
+                cur_opt.stream = OutputOption::STR_STDERR;
+
+            } else {
+                cerr << "Unrecognized console option: " << optarg << "\n";
+                return (1);
+            }
+            break;
+
+        case 'd':   // Debug level
+            cur_spec.setDbglevel(boost::lexical_cast<int>(optarg));
+            break;
+
+        case 'f':   // File output specification
+            // New output spec.  If one was currently active, add it to the
+            // list and reset the current output option to the defaults.
+            if (c_found || f_found || y_found) {
+                cur_spec.addOutputOption(cur_opt);
+                cur_opt = def_opt;
+                c_found = y_found = false;
+            }
+
+            // Set the output option for this switch.
+            f_found = true;
+            cur_opt.destination = OutputOption::DEST_FILE;
+            cur_opt.filename = optarg;
+            break;
+
+        case 'h':   // Help
+            usage();
+            return (0);
+
+        case 'l':   // Logger
+            // If a current specification is active, add the last output option
+            // to it, add it to the list and reset.  A specification is active
+            // if at least one switch has been previously found.
+            if (sw_found) {
+                cur_spec.addOutputOption(cur_opt);
+                loggers.push_back(cur_spec);
+                cur_spec.reset();
+            }
+
+            // Set the logger name
+            cur_spec.setName(std::string(optarg));
+
+            // Reset the output option to the default.
+            cur_opt = def_opt;
+
+            // Indicate nothing is found to prevent the console option (the
+            // default output option) being added to the output list if an
+            // output option is found.
+            c_found = f_found = y_found = false;
+            break;
+
+        case 'm':   // Maximum file version
+            if (!f_found) {
+                std::cerr << "Attempt to set maximum version (-m) "
+                             "outside of file output specification\n";
+                return (1);
+            }
+            try {
+                cur_opt.maxver = boost::lexical_cast<unsigned int>(optarg);
+            } catch (const boost::bad_lexical_cast&) {
+                std::cerr << "Maximum version (-m) argument must be a positive "
+                             "integer\n";
+                return (1);
+            }
+            break;
+
+        case 's':   // Severity
+            severity = optarg;
+            isc::util::str::uppercase(severity);
+            cur_spec.setSeverity(getSeverity(severity));
+            break;
+
+        case 'y':   // Syslog output
+            // New output spec.  If one was currently active, add it to the
+            // list and reset the current output option to the defaults.
+            if (c_found || f_found || y_found) {
+                cur_spec.addOutputOption(cur_opt);
+                cur_opt = def_opt;
+                c_found = f_found = false;
+            }
+            y_found = true;
+            cur_opt.destination = OutputOption::DEST_SYSLOG;
+            cur_opt.facility = optarg;
+            break;
+
+        case 'z':   // Maximum size
+            if (! f_found) {
+                std::cerr << "Attempt to set file size (-z) "
+                             "outside of file output specification\n";
+                return (1);
+            }
+            try {
+                cur_opt.maxsize = boost::lexical_cast<size_t>(optarg);
+            } catch (const boost::bad_lexical_cast&) {
+                std::cerr << "File size (-z) argument must be a positive "
+                             "integer\n";
+                return (1);
+            }
+            break;
+
+
+        default:
+            std::cerr << "Unrecognized option: " <<
+                static_cast<char>(option) << "\n";
+            return (1);
+        }
+
+        // Have found at least one command-line switch, so note the fact.
+        sw_found = true;
+    }
+
+    // Add the current (unfinished specification) to the list.
+    cur_spec.addOutputOption(cur_opt);
+    loggers.push_back(cur_spec);
+
+    // Set the logging options.
+    manager.process(loggers.begin(), loggers.end());
+
+    // Set the local file
+    if (optind < argc) {
+        LoggerManager::readLocalMessageFile(argv[optind]);
+    }
+
+    // Log a few messages to different loggers. Here, we switch to using
+    // null interprocess sync objects for the loggers below as the
+    // logger example can be used as a standalone program (which may not
+    // have write access to a local state directory to create
+    // lockfiles).
+    isc::log::Logger logger_ex(ROOT_NAME);
+    logger_ex.setInterprocessSync(new InterprocessSyncNull("logger"));
+    isc::log::Logger logger_alpha("alpha");
+    logger_alpha.setInterprocessSync(new InterprocessSyncNull("logger"));
+    isc::log::Logger logger_beta("beta");
+    logger_beta.setInterprocessSync(new InterprocessSyncNull("logger"));
+
+    LOG_FATAL(logger_ex, LOG_WRITE_ERROR).arg("test1").arg("42");
+    LOG_ERROR(logger_ex, LOG_READING_LOCAL_FILE).arg("dummy/file");
+    LOG_WARN(logger_ex, LOG_BAD_STREAM).arg("example");
+    LOG_WARN(logger_alpha, LOG_READ_ERROR).arg("a.txt").arg("dummy reason");
+    LOG_INFO(logger_alpha, LOG_INPUT_OPEN_FAIL).arg("example.msg").arg("dummy reason");
+    LOG_DEBUG(logger_ex, 0, LOG_READING_LOCAL_FILE).arg("example/0");
+    LOG_DEBUG(logger_ex, 24, LOG_READING_LOCAL_FILE).arg("example/24");
+    LOG_DEBUG(logger_ex, 25, LOG_READING_LOCAL_FILE).arg("example/25");
+    LOG_DEBUG(logger_ex, 26, LOG_READING_LOCAL_FILE).arg("example/26");
+    LOG_FATAL(logger_beta, LOG_BAD_SEVERITY).arg("beta_fatal");
+    LOG_ERROR(logger_beta, LOG_BAD_DESTINATION).arg("beta_error");
+    LOG_WARN(logger_beta, LOG_BAD_STREAM).arg("beta_warn");
+    LOG_INFO(logger_beta, LOG_READ_ERROR).arg("beta").arg("info");
+    LOG_DEBUG(logger_beta, 25, LOG_BAD_SEVERITY).arg("beta/25");
+    LOG_DEBUG(logger_beta, 26, LOG_BAD_SEVERITY).arg("beta/26");
+
+    return (0);
+}
diff --git a/src/lib/log/tests/logger_level_impl_unittest.cc b/src/lib/log/tests/logger_level_impl_unittest.cc
new file mode 100644
index 0000000..c82be69
--- /dev/null
+++ b/src/lib/log/tests/logger_level_impl_unittest.cc
@@ -0,0 +1,168 @@
+// 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 <iostream>
+#include <string>
+
+#include <gtest/gtest.h>
+#include <boost/static_assert.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include <log/logger_level_impl.h>
+#include <log/logger_support.h>
+#include <log4cplus/logger.h>
+
+using namespace isc::log;
+using namespace std;
+
+class LoggerLevelImplTest : public ::testing::Test {
+protected:
+    LoggerLevelImplTest() {
+        // Ensure logging set to default for unit tests
+        setDefaultLoggingOutput();
+    }
+
+    ~LoggerLevelImplTest()
+    {}
+};
+
+
+// Checks that the log4cplus and Kea levels convert correctly
+TEST_F(LoggerLevelImplTest, DefaultConversionFromBind) {
+    log4cplus::LogLevel fatal =
+        LoggerLevelImpl::convertFromBindLevel(Level(FATAL));
+    EXPECT_EQ(log4cplus::FATAL_LOG_LEVEL, fatal);
+
+    log4cplus::LogLevel error =
+        LoggerLevelImpl::convertFromBindLevel(Level(ERROR));
+    EXPECT_EQ(log4cplus::ERROR_LOG_LEVEL, error);
+
+    log4cplus::LogLevel warn =
+        LoggerLevelImpl::convertFromBindLevel(Level(WARN));
+    EXPECT_EQ(log4cplus::WARN_LOG_LEVEL, warn);
+
+    log4cplus::LogLevel info =
+        LoggerLevelImpl::convertFromBindLevel(Level(INFO));
+    EXPECT_EQ(log4cplus::INFO_LOG_LEVEL, info);
+
+    log4cplus::LogLevel debug =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL, debug);
+}
+
+// Checks that the debug severity and level converts correctly
+TEST_F(LoggerLevelImplTest, DebugConversionFromBind) {
+    log4cplus::LogLevel debug0 =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG, 0));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - 0, debug0);
+
+    log4cplus::LogLevel debug1 =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG, 1));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - 1, debug1);
+
+    log4cplus::LogLevel debug99 =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG, 99));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - 99, debug99);
+
+    // Out of range should be coerced to the nearest boundary
+    log4cplus::LogLevel debug_1 =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG, MIN_DEBUG_LEVEL - 1));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL, debug_1);
+
+    log4cplus::LogLevel debug100 =
+        LoggerLevelImpl::convertFromBindLevel(Level(DEBUG, MAX_DEBUG_LEVEL + 1));
+    EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - MAX_DEBUG_LEVEL, debug100);
+}
+
+// Do the checks the other way
+static void
+test_convert_to(const char* trace, isc::log::Severity severity, int dbglevel,
+                log4cplus::LogLevel level)
+{
+    SCOPED_TRACE(trace);
+    Level test = LoggerLevelImpl::convertToBindLevel(level);
+    EXPECT_EQ(severity, test.severity);
+    EXPECT_EQ(dbglevel, test.dbglevel);
+}
+
+TEST_F(LoggerLevelImplTest, ConversionToBind) {
+    test_convert_to("FATAL", FATAL, MIN_DEBUG_LEVEL, log4cplus::FATAL_LOG_LEVEL);
+    test_convert_to("ERROR", ERROR, MIN_DEBUG_LEVEL, log4cplus::ERROR_LOG_LEVEL);
+    test_convert_to("WARN",  WARN , MIN_DEBUG_LEVEL, log4cplus::WARN_LOG_LEVEL);
+    test_convert_to("INFO",  INFO , MIN_DEBUG_LEVEL, log4cplus::INFO_LOG_LEVEL);
+    test_convert_to("DEBUG",  DEBUG, MIN_DEBUG_LEVEL, log4cplus::DEBUG_LOG_LEVEL);
+
+    test_convert_to("DEBUG0",  DEBUG, MIN_DEBUG_LEVEL + 0,
+            (log4cplus::DEBUG_LOG_LEVEL));
+    test_convert_to("DEBUG1",  DEBUG, MIN_DEBUG_LEVEL + 1,
+            (log4cplus::DEBUG_LOG_LEVEL - 1));
+    test_convert_to("DEBUG2",  DEBUG, MIN_DEBUG_LEVEL + 2,
+            (log4cplus::DEBUG_LOG_LEVEL - 2));
+    test_convert_to("DEBUG99",  DEBUG, MIN_DEBUG_LEVEL + 99,
+            (log4cplus::DEBUG_LOG_LEVEL - 99));
+
+    // ... and some invalid valid values
+    test_convert_to("DEBUG-1",  INFO, MIN_DEBUG_LEVEL,
+            (log4cplus::DEBUG_LOG_LEVEL + 1));
+    BOOST_STATIC_ASSERT(MAX_DEBUG_LEVEL == 99);
+    test_convert_to("DEBUG+100",  DEFAULT, 0,
+            (log4cplus::DEBUG_LOG_LEVEL - MAX_DEBUG_LEVEL - 1));
+}
+
+// Check that we can convert from a string to the new log4cplus levels
+TEST_F(LoggerLevelImplTest, FromString) {
+
+    // Test all valid values
+    for (int i = MIN_DEBUG_LEVEL; i <= MAX_DEBUG_LEVEL; ++i) {
+        std::string token = string("DEBUG") + boost::lexical_cast<std::string>(i);
+        EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - i,
+                  LoggerLevelImpl::logLevelFromString(token));
+    }
+
+    // ... in lowercase too
+    for (int i = MIN_DEBUG_LEVEL; i <= MAX_DEBUG_LEVEL; ++i) {
+        std::string token = string("debug") + boost::lexical_cast<std::string>(i);
+        EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - i,
+                  LoggerLevelImpl::logLevelFromString(token));
+    }
+
+    // A few below the minimum
+    for (int i = MIN_DEBUG_LEVEL - 5; i < MIN_DEBUG_LEVEL; ++i) {
+        std::string token = string("DEBUG") + boost::lexical_cast<std::string>(i);
+        EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL, LoggerLevelImpl::logLevelFromString(token));
+    }
+
+    // ... and above the maximum
+    for (int i = MAX_DEBUG_LEVEL + 1; i < MAX_DEBUG_LEVEL + 5; ++i) {
+        std::string token = string("DEBUG") + boost::lexical_cast<std::string>(i);
+        EXPECT_EQ(log4cplus::DEBUG_LOG_LEVEL - MAX_DEBUG_LEVEL,
+                  LoggerLevelImpl::logLevelFromString(token));
+    }
+
+    // Invalid strings.
+    EXPECT_EQ(log4cplus::NOT_SET_LOG_LEVEL,
+              LoggerLevelImpl::logLevelFromString("DEBU"));
+    EXPECT_EQ(log4cplus::NOT_SET_LOG_LEVEL,
+              LoggerLevelImpl::logLevelFromString("unrecognized"));
+}
+
+// ... and check the conversion back again.  All levels should convert to "DEBUG".
+TEST_F(LoggerLevelImplTest, ToString) {
+
+    for (int i = MIN_DEBUG_LEVEL; i <= MAX_DEBUG_LEVEL; ++i) {
+        EXPECT_EQ(std::string("DEBUG"),
+                  LoggerLevelImpl::logLevelToString(log4cplus::DEBUG_LOG_LEVEL - i));
+    }
+
+    // ... and that out of range stuff returns an empty string.
+    EXPECT_EQ(std::string(),
+              LoggerLevelImpl::logLevelToString(log4cplus::DEBUG_LOG_LEVEL + 1));
+    EXPECT_EQ(std::string(),
+              LoggerLevelImpl::logLevelToString(
+                               log4cplus::DEBUG_LOG_LEVEL - MAX_DEBUG_LEVEL - 100));
+}
diff --git a/src/lib/log/tests/logger_level_unittest.cc b/src/lib/log/tests/logger_level_unittest.cc
new file mode 100644
index 0000000..ccaecd9
--- /dev/null
+++ b/src/lib/log/tests/logger_level_unittest.cc
@@ -0,0 +1,78 @@
+// 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 <iostream>
+#include <string>
+
+#include <gtest/gtest.h>
+
+#include <log/logger.h>
+#include <log/logger_manager.h>
+#include <log/log_messages.h>
+#include <log/logger_support.h>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+class LoggerLevelTest : public ::testing::Test {
+protected:
+    LoggerLevelTest() {
+        // Logger initialization is done in main().  As logging tests may
+        // alter the default logging output, it is reset here.
+        setDefaultLoggingOutput();
+    }
+    ~LoggerLevelTest() {
+        LoggerManager::reset();
+    }
+};
+
+
+// Checks that the logger is named correctly.
+
+TEST_F(LoggerLevelTest, Creation) {
+
+    // Default
+    isc::log::Level level1;
+    EXPECT_EQ(isc::log::DEFAULT, level1.severity);
+    EXPECT_EQ(isc::log::MIN_DEBUG_LEVEL, level1.dbglevel);
+
+    // Single argument constructor.
+    isc::log::Level level2(isc::log::FATAL);
+    EXPECT_EQ(isc::log::FATAL, level2.severity);
+    EXPECT_EQ(isc::log::MIN_DEBUG_LEVEL, level2.dbglevel);
+
+    // Two-argument constructor
+    isc::log::Level level3(isc::log::DEBUG, 42);
+    EXPECT_EQ(isc::log::DEBUG, level3.severity);
+    EXPECT_EQ(42, level3.dbglevel);
+}
+
+TEST_F(LoggerLevelTest, getSeverity) {
+    EXPECT_EQ(DEBUG, getSeverity("DEBUG"));
+    EXPECT_EQ(DEBUG, getSeverity("debug"));
+    EXPECT_EQ(DEBUG, getSeverity("DeBuG"));
+    EXPECT_EQ(INFO, getSeverity("INFO"));
+    EXPECT_EQ(INFO, getSeverity("info"));
+    EXPECT_EQ(INFO, getSeverity("iNfO"));
+    EXPECT_EQ(WARN, getSeverity("WARN"));
+    EXPECT_EQ(WARN, getSeverity("warn"));
+    EXPECT_EQ(WARN, getSeverity("wARn"));
+    EXPECT_EQ(ERROR, getSeverity("ERROR"));
+    EXPECT_EQ(ERROR, getSeverity("error"));
+    EXPECT_EQ(ERROR, getSeverity("ERRoR"));
+    EXPECT_EQ(FATAL, getSeverity("FATAL"));
+    EXPECT_EQ(FATAL, getSeverity("fatal"));
+    EXPECT_EQ(FATAL, getSeverity("FAtaL"));
+
+    // bad values should default to stdout
+    EXPECT_EQ(INFO, getSeverity("some bad value"));
+    EXPECT_EQ(INFO, getSeverity(""));
+
+    LoggerManager::reset();
+}
diff --git a/src/lib/log/tests/logger_lock_test.cc b/src/lib/log/tests/logger_lock_test.cc
new file mode 100644
index 0000000..9908800
--- /dev/null
+++ b/src/lib/log/tests/logger_lock_test.cc
@@ -0,0 +1,101 @@
+// Copyright (C) 2012-2019 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 <log/macros.h>
+#include <log/logger_support.h>
+#include <log/logger_manager.h>
+#include <log/log_messages.h>
+#include <log/interprocess/interprocess_sync.h>
+#include <log/tests/log_test_messages.h>
+
+#include <mutex>
+#include <iostream>
+
+#include <boost/noncopyable.hpp>
+
+using namespace std;
+using namespace isc::log;
+
+/// \brief RAII safe mutex checker.
+class CheckMutex : boost::noncopyable {
+public:
+    /// \brief Exception thrown when the mutex is already locked.
+    struct AlreadyLocked : public isc::InvalidParameter {
+        AlreadyLocked(const char* file, size_t line, const char* what) :
+            isc::InvalidParameter(file, line, what)
+        {}
+    };
+
+    /// \brief Constructor.
+    ///
+    /// \throw AlreadyLocked if the mutex is already locked.
+    CheckMutex(mutex& mutex) : mutex_(mutex) {
+        if (!mutex.try_lock()) {
+            isc_throw(AlreadyLocked, "The mutex is already locked");
+        }
+    }
+
+    /// \brief Destructor.
+    ///
+    /// Unlocks the mutex.
+    ~CheckMutex() {
+        mutex_.unlock();
+    }
+
+private:
+    mutex& mutex_;
+};
+
+class MockLoggingSync : public isc::log::interprocess::InterprocessSync {
+public:
+    /// \brief Constructor
+    MockLoggingSync(const std::string& component_name) :
+        InterprocessSync(component_name)
+    {}
+
+protected:
+    virtual bool lock() {
+        // We first check if the logger acquired a lock on the
+        // LoggerManager mutex.
+        try {
+            CheckMutex check(LoggerManager::getMutex());
+        } catch (const CheckMutex::AlreadyLocked&) {
+            cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: MUTEXLOCK\n";
+        }
+
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: LOCK\n";
+        return (true);
+    }
+
+    virtual bool tryLock() {
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: TRYLOCK\n";
+        return (true);
+    }
+
+    virtual bool unlock() {
+        cout << "FIELD1 FIELD2 LOGGER_LOCK_TEST: UNLOCK\n";
+        return (true);
+    }
+};
+
+/// \brief Test logger lock sequence
+///
+/// A program used in testing the logger. It verifies that (1) an
+/// interprocess sync lock is first acquired by the logger, (2) the
+/// message is logged by the logger, and (3) the lock is released in
+/// that sequence.
+int
+main(int, char**) {
+    initLogger();
+    Logger logger("log");
+    logger.setInterprocessSync(new MockLoggingSync("log"));
+
+    LOG_INFO(logger, LOG_LOCK_TEST_MESSAGE);
+
+    return (0);
+}
diff --git a/src/lib/log/tests/logger_lock_test.sh.in b/src/lib/log/tests/logger_lock_test.sh.in
new file mode 100644
index 0000000..2cea0f0
--- /dev/null
+++ b/src/lib/log/tests/logger_lock_test.sh.in
@@ -0,0 +1,38 @@
+#!/bin/sh
+
+# Copyright (C) 2012-2020 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/.
+
+# Checks that the locker interprocess sync locks are acquired and
+# released correctly.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/logger_lock_test_tempfile_$$"
+destfile="@abs_builddir@/logger_lock_test_destfile_$$"
+
+test_start 'logger_lock'
+cat > $tempfile << .
+LOGGER_LOCK_TEST: MUTEXLOCK
+LOGGER_LOCK_TEST: LOCK
+INFO  [kea.log] LOG_LOCK_TEST_MESSAGE this is a test message.
+LOGGER_LOCK_TEST: UNLOCK
+.
+rm -f $destfile
+KEA_LOGGER_SEVERITY=INFO KEA_LOGGER_DESTINATION=stdout ./logger_lock_test | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' > $destfile
+cut -d' ' -f3- $destfile | diff $tempfile -
+test_finish $?
+
+# Tidy up.
+rm -f $tempfile $destfile
diff --git a/src/lib/log/tests/logger_manager_unittest.cc b/src/lib/log/tests/logger_manager_unittest.cc
new file mode 100644
index 0000000..6bde1db
--- /dev/null
+++ b/src/lib/log/tests/logger_manager_unittest.cc
@@ -0,0 +1,511 @@
+// Copyright (C) 2011-2022 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 <stdio.h>
+#include <unistd.h>
+
+#include <fstream>
+#include <iostream>
+#include <string>
+
+#include <gtest/gtest.h>
+
+#include <boost/scoped_array.hpp>
+#include <boost/lexical_cast.hpp>
+
+#include <exceptions/exceptions.h>
+
+#include <log/macros.h>
+#include <log/log_messages.h>
+#include <log/logger.h>
+#include <log/logger_level.h>
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_specification.h>
+#include <log/message_initializer.h>
+#include <log/output_option.h>
+#include <log/tests/tempdir.h>
+#include <testutils/gtest_utils.h>
+
+#include <sys/types.h>
+#include <regex.h>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+/// \brief LoggerManager Test
+class LoggerManagerTest : public ::testing::Test {
+public:
+    LoggerManagerTest() {
+        // Initialization of logging is done in main()
+    }
+
+    ~LoggerManagerTest() {
+        LoggerManager::reset();
+    }
+};
+
+// Convenience class to create the specification for the logger "filelogger",
+// which, as the name suggests, logs to a file.  It remembers the file name and
+// deletes the file when instance of the class is destroyed.
+class SpecificationForFileLogger {
+public:
+
+    // Constructor - allocate file and create the specification object
+    SpecificationForFileLogger() : spec_(), name_(createTempFilename()),
+                                   logname_("filelogger") {
+
+        // Set the output to a temporary file.
+        OutputOption option;
+        option.destination = OutputOption::DEST_FILE;
+        option.filename = name_;
+
+        // Set target output to the file logger.  The defaults indicate
+        // INFO severity.
+        spec_.setName(logname_);
+        spec_.addOutputOption(option);
+    }
+
+    // Destructor, remove the file.  This is only a test, so ignore failures
+    ~SpecificationForFileLogger() {
+        if (! name_.empty()) {
+            static_cast<void>(remove(name_.c_str()));
+
+            // Depending on the log4cplus version, a lock file may also be
+            // created.
+            static_cast<void>(remove((name_ + ".lock").c_str()));
+        }
+    }
+
+    // Return reference to the logging specification for this loggger
+    LoggerSpecification& getSpecification() {
+        return spec_;
+    }
+
+    // Return name of the logger
+    string getLoggerName() const {
+        return logname_;
+    }
+
+    // Return name of the file
+    string getFileName() const {
+        return name_;
+    }
+
+    // Create temporary filename
+    //
+    // The compiler warns against tmpnam() and suggests mkstemp instead.
+    // Unfortunately, this creates the filename and opens it.  So we need to
+    // close and delete the file before returning the name.  Also, the name
+    // is based on the template supplied and the name of the temporary
+    // directory may vary between systems.  So translate TMPDIR and if that
+    // does not exist, use /tmp.
+    //
+    // \return Temporary file name
+    static std::string createTempFilename() {
+        string filename = TEMP_DIR + "/kea_logger_manager_test_XXXXXX";
+
+        // Copy into writable storage for the call to mkstemp
+        boost::scoped_array<char> tname(new char[filename.size() + 1]);
+        strcpy(tname.get(), filename.c_str());
+
+        // Create file, close and delete it, and store the name for later.
+        // There is still a race condition here, albeit a small one.
+        int filenum = mkstemp(tname.get());
+        if (filenum == -1) {
+            isc_throw(Exception, "Unable to obtain unique filename");
+        }
+        close(filenum);
+
+        return (string(tname.get()));
+    }
+
+
+private:
+    LoggerSpecification     spec_;      // Specification for this file logger
+    string                  name_;      // Name of the output file
+    string                  logname_;   // Name of this logger
+};
+
+// Convenience function to read an output log file and check that each line
+// contains the expected message ID
+//
+// \param filename Name of the file to check
+// \param start Iterator pointing to first expected message ID
+// \param finish Iterator pointing to last expected message ID
+template <typename T>
+void checkFileContents(const std::string& filename, T start, T finish) {
+
+    // Access the file for input
+    ifstream infile(filename.c_str());
+    if (! infile.good()) {
+        FAIL() << "Unable to open the logging file " << filename;
+    }
+
+    // Iterate round the expected message IDs and check that they appear in
+    // the string.
+    string line;    // Line read from the file
+
+    T i = start;    // Iterator
+    getline(infile, line);
+    int lineno = 1;
+
+    while ((i != finish) && (infile.good())) {
+
+        // Check that the message ID appears in the line.
+        EXPECT_TRUE(line.find(string(*i)) != string::npos)
+            << "Expected to find " << string(*i) << " on line " << lineno
+            << " of logging file " << filename;
+
+        // Go for the next line
+        ++i;
+        getline(infile, line);
+        ++lineno;
+    }
+
+    // Why did the loop end?
+    EXPECT_TRUE(i == finish) << "Did not reach the end of the message ID list";
+    EXPECT_TRUE(infile.eof()) << "Did not reach the end of the logging file";
+
+    // File will close when the instream is deleted at the end of this
+    // function.
+}
+
+// Check that the logger correctly creates something logging to a file.
+TEST_F(LoggerManagerTest, FileLogger) {
+
+    // Create a specification for the file logger and use the manager to
+    // connect the "filelogger" logger to it.
+    SpecificationForFileLogger file_spec;
+
+    // For the first test, we want to check that the file is created
+    // if it does not already exist.  So delete the temporary file before
+    // logging the first message.
+    static_cast<void>(remove(file_spec.getFileName().c_str()));
+
+    // Set up the file appenders.
+    LoggerManager manager;
+    manager.process(file_spec.getSpecification());
+
+    // Try logging to the file.  Local scope is set to ensure that the logger
+    // is destroyed before we reset the global logging.  We record what we
+    // put in the file for a later comparison.
+    vector<MessageID> ids;
+    {
+
+        // Scope-limit the logger to ensure it is destroyed after the brief
+        // check.  This adds weight to the idea that the logger will not
+        // keep the file open.
+        Logger logger(file_spec.getLoggerName().c_str());
+
+        LOG_FATAL(logger, LOG_DUPLICATE_MESSAGE_ID).arg("test");
+        ids.push_back(LOG_DUPLICATE_MESSAGE_ID);
+
+        LOG_FATAL(logger, LOG_DUPLICATE_NAMESPACE).arg("test");
+        ids.push_back(LOG_DUPLICATE_NAMESPACE);
+    }
+    LoggerManager::reset();
+
+    // At this point, the output file should contain two lines with messages
+    // LOG_DUPLICATE_MESSAGE_ID and LOG_DUPLICATE_NAMESPACE messages - test this.
+    checkFileContents(file_spec.getFileName(), ids.begin(), ids.end());
+
+    // Re-open the file (we have to assume that it was closed when we
+    // reset the logger - there is no easy way to check) and check that
+    // new messages are appended to it.  We use the alternative
+    // invocation of process() here to check it works.
+    vector<LoggerSpecification> spec(1, file_spec.getSpecification());
+    manager.process(spec.begin(), spec.end());
+
+    // Create a new instance of the logger and log three more messages.
+    Logger logger(file_spec.getLoggerName().c_str());
+
+    LOG_FATAL(logger, LOG_NO_SUCH_MESSAGE).arg("test");
+    ids.push_back(LOG_NO_SUCH_MESSAGE);
+
+    LOG_FATAL(logger, LOG_INVALID_MESSAGE_ID).arg("test").arg("test2");
+    ids.push_back(LOG_INVALID_MESSAGE_ID);
+
+    LOG_FATAL(logger, LOG_NO_MESSAGE_ID).arg("42");
+    ids.push_back(LOG_NO_MESSAGE_ID);
+
+    // Close the file and check again
+    LoggerManager::reset();
+    checkFileContents(file_spec.getFileName(), ids.begin(), ids.end());
+}
+
+// Check if the file rolls over when it gets above a certain size.
+TEST_F(LoggerManagerTest, FileSizeRollover) {
+    // Set to a suitable minimum that log4cplus can cope with.
+    static const size_t SIZE_LIMIT = 204800;
+
+    // Set up the name of the file.
+    SpecificationForFileLogger file_spec;
+    LoggerSpecification& spec = file_spec.getSpecification();
+
+    // Expand the option to ensure that a maximum version size is set.
+    LoggerSpecification::iterator opt = spec.begin();
+    EXPECT_TRUE(opt != spec.end());
+    opt->maxsize = SIZE_LIMIT;    // Bytes
+    opt->maxver = 2;
+
+    // The current output file does not exist (the creation of file_spec
+    // ensures that.  Check that previous versions don't either.
+    vector<string> prev_name;
+    for (int i = 0; i < 3; ++i) {
+        prev_name.push_back(file_spec.getFileName() + "." +
+                            boost::lexical_cast<string>(i + 1));
+        (void) remove(prev_name[i].c_str());
+    }
+
+    // Generate an argument for a message that ensures that the message when
+    // logged will be over that size.
+    string big_arg(SIZE_LIMIT, 'x');
+
+    // Set up the file logger
+    LoggerManager manager;
+    manager.process(spec);
+
+    // Log the message twice using different message IDs.  This should generate
+    // three files as for the log4cplus implementation, the files appear to
+    // be rolled after the message is logged.
+    {
+        Logger logger(file_spec.getLoggerName().c_str());
+        LOG_FATAL(logger, LOG_NO_SUCH_MESSAGE).arg(big_arg);
+        LOG_FATAL(logger, LOG_DUPLICATE_NAMESPACE).arg(big_arg);
+    }
+
+    // Check them.
+    LoggerManager::reset();     // Ensure files are closed
+
+    vector<MessageID> ids;
+    ids.push_back(LOG_NO_SUCH_MESSAGE);
+    checkFileContents(prev_name[1], ids.begin(), ids.end());
+
+    ids.clear();
+    ids.push_back(LOG_DUPLICATE_NAMESPACE);
+    checkFileContents(prev_name[0], ids.begin(), ids.end());
+
+    // Log another message and check that the files have rotated and that
+    // a .3 version does not exist.
+    manager.process(spec);
+    {
+        Logger logger(file_spec.getLoggerName().c_str());
+        LOG_FATAL(logger, LOG_NO_MESSAGE_TEXT).arg("42").arg(big_arg);
+    }
+
+    LoggerManager::reset();     // Ensure files are closed
+
+    // Check that the files have moved.
+    ids.clear();
+    ids.push_back(LOG_DUPLICATE_NAMESPACE);
+    checkFileContents(prev_name[1], ids.begin(), ids.end());
+
+    ids.clear();
+    ids.push_back(LOG_NO_MESSAGE_TEXT);
+    checkFileContents(prev_name[0], ids.begin(), ids.end());
+
+    // ... and check that the .3 version does not exist.
+    ifstream file3(prev_name[2].c_str(), ifstream::in);
+    EXPECT_FALSE(file3.good());
+
+    // Tidy up
+    for (vector<string>::size_type i = 0; i < prev_name.size(); ++i) {
+       (void) remove(prev_name[i].c_str());
+    }
+}
+
+// Check if an exception is thrown if maxsize is too large.
+TEST_F(LoggerManagerTest, TooLargeMaxsize) {
+    // Set up the name of the file.
+    SpecificationForFileLogger file_spec;
+    LoggerSpecification& spec(file_spec.getSpecification());
+
+    // UINT64_MAX should be large enough.
+    LoggerSpecification::iterator opt = spec.begin();
+    EXPECT_TRUE(opt != spec.end());
+    opt->maxsize = std::numeric_limits<uint64_t>::max();  // bytes
+
+    // Set up the file logger.
+    LoggerManager manager;
+    EXPECT_THROW_MSG(manager.process(spec), BadValue,
+                     "expected maxsize < 2147483647MB, but instead got "
+                     "18446744073709MB");
+
+    opt->maxsize = 1000000LL * (std::numeric_limits<int32_t>::max() + 1LL);  // bytes
+    EXPECT_THROW_MSG(manager.process(spec), BadValue,
+                     "expected maxsize < 2147483647MB, but instead got "
+                     "2147483648MB");
+}
+
+namespace { // begin unnamed namespace
+
+// When we begin to use C++11, we could replace use of POSIX API with
+// <regex>.
+
+class RegexHolder {
+public:
+    RegexHolder(const char* expr, const int flags = REG_EXTENDED) {
+        const int rc = regcomp(&regex_, expr, flags);
+        if (rc) {
+            regfree(&regex_);
+            throw;
+        }
+    }
+
+    ~RegexHolder() {
+        regfree(&regex_);
+    }
+
+    regex_t* operator*() {
+        return (&regex_);
+    }
+
+private:
+    regex_t regex_;
+};
+
+} // end of unnamed namespace
+
+// Check that the logger correctly outputs the full formatted layout
+// pattern.
+TEST_F(LoggerManagerTest, checkLayoutPattern) {
+    // Create a specification for the file logger and use the manager to
+    // connect the "filelogger" logger to it.
+    SpecificationForFileLogger file_spec;
+
+    // For the first test, we want to check that the file is created
+    // if it does not already exist.  So delete the temporary file before
+    // logging the first message.
+    static_cast<void>(remove(file_spec.getFileName().c_str()));
+
+    // Set up the file appenders.
+    LoggerManager manager;
+    manager.process(file_spec.getSpecification());
+
+    // Try logging to the file.  Local scope is set to ensure that the logger
+    // is destroyed before we reset the global logging.
+    {
+        Logger logger(file_spec.getLoggerName().c_str());
+        LOG_FATAL(logger, LOG_DUPLICATE_MESSAGE_ID).arg("test");
+    }
+
+    LoggerManager::reset();
+
+    // Access the file for input
+    const std::string& filename = file_spec.getFileName();
+    ifstream infile(filename.c_str());
+    if (! infile.good()) {
+        FAIL() << "Unable to open the logging file " << filename;
+    }
+
+    std::string line;
+    std::getline(infile, line);
+
+    RegexHolder regex(// %D{%Y-%m-%d %H:%M:%S.%q}
+                      "^[[:digit:]]{4}-[[:digit:]]{2}-[[:digit:]]{2}[[:space:]]"
+                      "[[:digit:]]{2}:[[:digit:]]{2}:[[:digit:]]{2}\\.[[:digit:]]+[[:space:]]"
+                      // %-5p
+                      "[[:alpha:]]{1,5}[[:space:]]"
+                      // [%c/%i/%t]
+                      "\\[[[:alnum:]\\-\\.]+/[[:digit:]]+\\.(0x)?[[:xdigit:]]+\\][[:space:]]"
+                      );
+
+    const int re = regexec(*regex, line.c_str(), 0, NULL, 0);
+    ASSERT_EQ(0, re)
+        << "Logged message does not match expected layout pattern";
+}
+
+// Check that after calling the logDuplicatedMessages, the duplicated
+// messages are removed.
+TEST_F(LoggerManagerTest, logDuplicatedMessages) {
+    // Original set should not have duplicates.
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+
+    // This just defines 1, but we'll add it a number of times.
+    const char* dupe[] = {
+        "DUPE", "dupe",
+        NULL
+    };
+    const MessageInitializer init_message_initializer_1(dupe);
+    const MessageInitializer init_message_initializer_2(dupe);
+
+    MessageInitializer::loadDictionary();
+    // Should have a duplicate now.
+    ASSERT_EQ(1, MessageInitializer::getDuplicates().size());
+
+    // The logDuplicatedMessages, besides logging, should also remove the
+    // duplicates.
+    LoggerManager::logDuplicatedMessages();
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+}
+
+// Check that output options can be inherited.
+TEST_F(LoggerManagerTest, outputOptionsInheritance) {
+    LoggerManager manager;
+    SpecificationForFileLogger file_spec;
+    vector<LoggerSpecification> specs;
+
+    // Create the root logger configuration with a file output option.
+    string root_name(getRootLoggerName());
+    LoggerSpecification root_spec(root_name);
+    OutputOption root_option;
+    root_option.destination = OutputOption::DEST_FILE;
+    root_option.filename = file_spec.getFileName();
+    root_option.pattern = "%p %m\n";
+    root_spec.addOutputOption(root_option);
+    specs.push_back(root_spec);
+
+    // Create a child logger configuration without any output options.
+    // It should inherit the output option from the root logger.
+    string foo_name(root_name + ".foo");
+    LoggerSpecification foo_spec(foo_name);
+    specs.push_back(foo_spec);
+
+    // Create another child logger configuration with a console output option.
+    string bar_name(root_name + ".bar");
+    LoggerSpecification bar_spec(bar_name);
+    OutputOption bar_option;
+    bar_option.destination = OutputOption::DEST_CONSOLE;
+    bar_option.pattern = "%p %m\n";
+    bar_spec.addOutputOption(bar_option);
+    specs.push_back(bar_spec);
+
+    // Check the number of output options for each specification.
+    EXPECT_EQ(root_spec.optionCount(), 1);
+    EXPECT_EQ(foo_spec.optionCount(), 0);
+    EXPECT_EQ(bar_spec.optionCount(), 1);
+
+    // Process all the specifications.
+    manager.process(specs.begin(), specs.end());
+
+    // Log two messages each.
+    Logger root_logger(root_name.c_str());
+    Logger foo_logger(foo_name.c_str());
+    Logger bar_logger(bar_name.c_str());
+    LOG_INFO(root_logger, "from root logger 1");
+    LOG_INFO(foo_logger, "from foo logger 1");
+    LOG_INFO(bar_logger, "from bar logger 1");
+    LOG_INFO(root_logger, "from root logger 2");
+    LOG_INFO(foo_logger, "from foo logger 2");
+    LOG_INFO(bar_logger, "from bar logger 2");
+
+    // Check that root and foo were logged to file and that bar which
+    // had an explicit console configuration did not.
+    std::ifstream ifs(file_spec.getFileName());
+    std::stringstream s;
+    s << ifs.rdbuf();
+    std::string const result(s.str());
+    EXPECT_NE(result.find("INFO from root logger 1"), string::npos);
+    EXPECT_NE(result.find("INFO from foo logger 1"), string::npos);
+    EXPECT_EQ(result.find("INFO from bar logger 1"), string::npos);
+    EXPECT_NE(result.find("INFO from root logger 2"), string::npos);
+    EXPECT_NE(result.find("INFO from foo logger 2"), string::npos);
+    EXPECT_EQ(result.find("INFO from bar logger 2"), string::npos);
+}
diff --git a/src/lib/log/tests/logger_name_unittest.cc b/src/lib/log/tests/logger_name_unittest.cc
new file mode 100644
index 0000000..9048bf2
--- /dev/null
+++ b/src/lib/log/tests/logger_name_unittest.cc
@@ -0,0 +1,76 @@
+// 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 <string>
+
+#include <gtest/gtest.h>
+
+#include <log/logger_name.h>
+
+using namespace isc;
+using namespace isc::log;
+
+// Test class.  To avoid disturbing the root logger configuration in other
+// tests in the suite, the root logger name is saved in the constructor and
+// restored in the destructor.  However, this is a bit chicken and egg, as the
+// functions used to do the save and restore are those being tested...
+//
+// Note that the root name is originally set by the initialization of the
+// logging configuration done in main().
+
+class LoggerNameTest : public ::testing::Test {
+public:
+    LoggerNameTest() :
+        name_(getRootLoggerName())
+    {}
+    ~LoggerNameTest() {
+        setRootLoggerName(name_);
+    }
+
+private:
+    std::string     name_;  ///< Saved name
+};
+
+// Check setting and getting of root name
+
+TEST_F(LoggerNameTest, RootNameSetGet) {
+    const std::string name1 = "test1";
+    const std::string name2 = "test2";
+
+    // Check that Set/Get works
+    setRootLoggerName(name1);
+    EXPECT_EQ(name1, getRootLoggerName());
+
+    // We could not test that the root logger name is initialized
+    // correctly (as there is one instance of it and we don't know
+    // when this test will be run) so to check that setName() actually
+    // does change the name, run the test again with a different name.
+    //
+    // (There was always the outside chance that the root logger name
+    // was initialized with name1 and that setName() has no effect.)
+    setRootLoggerName(name2);
+    EXPECT_EQ(name2, getRootLoggerName());
+}
+
+// Check expansion of name
+
+TEST_F(LoggerNameTest, ExpandLoggerName) {
+    const std::string ROOT = "example";
+    const std::string NAME = "something";
+    const std::string FULL_NAME = ROOT + "." + NAME;
+
+    setRootLoggerName(ROOT);
+    EXPECT_EQ(ROOT, expandLoggerName(ROOT));
+    EXPECT_EQ(FULL_NAME, expandLoggerName(NAME));
+    EXPECT_EQ(FULL_NAME, expandLoggerName(FULL_NAME));
+}
+
+// Checks that the default logger name is returned properly.
+TEST_F(LoggerNameTest, default) {
+    EXPECT_EQ("kea", getDefaultRootLoggerName());
+}
diff --git a/src/lib/log/tests/logger_specification_unittest.cc b/src/lib/log/tests/logger_specification_unittest.cc
new file mode 100644
index 0000000..be9da6e
--- /dev/null
+++ b/src/lib/log/tests/logger_specification_unittest.cc
@@ -0,0 +1,90 @@
+// 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 <string>
+
+#include <gtest/gtest.h>
+
+#include <log/logger_specification.h>
+#include <log/output_option.h>
+
+using namespace isc::log;
+using namespace std;
+
+// Check default initialization.
+TEST(LoggerSpecificationTest, DefaultInitialization) {
+    LoggerSpecification spec;
+
+    EXPECT_EQ(string(""), spec.getName());
+    EXPECT_EQ(isc::log::INFO, spec.getSeverity());
+    EXPECT_EQ(0, spec.getDbglevel());
+    EXPECT_FALSE(spec.getAdditive());
+    EXPECT_EQ(0, spec.optionCount());
+}
+
+// Non-default initialization
+TEST(LoggerSpecificationTest, Initialization) {
+    LoggerSpecification spec("alpha", isc::log::ERROR, 42, true);
+
+    EXPECT_EQ(string("alpha"), spec.getName());
+    EXPECT_EQ(isc::log::ERROR, spec.getSeverity());
+    EXPECT_EQ(42, spec.getDbglevel());
+    EXPECT_TRUE(spec.getAdditive());
+    EXPECT_EQ(0, spec.optionCount());
+}
+
+// Get/Set tests
+TEST(LoggerSpecificationTest, SetGet) {
+    LoggerSpecification spec;
+
+    spec.setName("gamma");
+    EXPECT_EQ(string("gamma"), spec.getName());
+
+    spec.setSeverity(isc::log::FATAL);
+    EXPECT_EQ(isc::log::FATAL, spec.getSeverity());
+
+    spec.setDbglevel(7);
+    EXPECT_EQ(7, spec.getDbglevel());
+
+    spec.setAdditive(true);
+    EXPECT_TRUE(spec.getAdditive());
+
+    // Should not affect option count
+    EXPECT_EQ(0, spec.optionCount());
+}
+
+// Check option setting
+TEST(LoggerSpecificationTest, AddOption) {
+    OutputOption option1;
+    option1.destination = OutputOption::DEST_FILE;
+    option1.filename = "/tmp/example.log";
+    option1.maxsize = 123456;
+
+    OutputOption option2;
+    option2.destination = OutputOption::DEST_SYSLOG;
+    option2.facility = "LOCAL7";
+
+    LoggerSpecification spec;
+    spec.addOutputOption(option1);
+    spec.addOutputOption(option2);
+    EXPECT_EQ(2, spec.optionCount());
+
+    // Iterate through them
+    LoggerSpecification::const_iterator i = spec.begin();
+
+    EXPECT_EQ(OutputOption::DEST_FILE, i->destination);
+    EXPECT_EQ(string("/tmp/example.log"), i->filename);
+    EXPECT_EQ(123456, i->maxsize);
+
+    ++i;
+    EXPECT_EQ(OutputOption::DEST_SYSLOG, i->destination);
+    EXPECT_EQ(string("LOCAL7"), i->facility);
+
+    ++i;
+    EXPECT_TRUE(i == spec.end());
+}
diff --git a/src/lib/log/tests/logger_support_unittest.cc b/src/lib/log/tests/logger_support_unittest.cc
new file mode 100644
index 0000000..3f2943c
--- /dev/null
+++ b/src/lib/log/tests/logger_support_unittest.cc
@@ -0,0 +1,77 @@
+// 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 <gtest/gtest.h>
+#include <log/logger_support.h>
+#include <log/log_messages.h>
+
+using namespace isc::log;
+
+class LoggerSupportTest : public ::testing::Test {
+protected:
+    LoggerSupportTest() {
+        // Logger initialization is done in main().  As logging tests may
+        // alter the default logging output, it is reset here.
+        setDefaultLoggingOutput();
+    }
+    ~LoggerSupportTest() {
+    }
+};
+
+// Check that the initialized flag can be manipulated.  This is a bit chicken-
+// -and-egg: we want to reset to the flag to the original value at the end
+// of the test, so use the functions to do that.  But we are trying to check
+// that these functions in fact work.
+
+TEST_F(LoggerSupportTest, InitializedFlag) {
+    bool current_flag = isLoggingInitialized();
+
+    // check we can flip the flag.
+    setLoggingInitialized(!current_flag);
+    EXPECT_NE(current_flag, isLoggingInitialized());
+    setLoggingInitialized(!isLoggingInitialized());
+    EXPECT_EQ(current_flag, isLoggingInitialized());
+
+    // Check we can set it to explicit values (tests that a call to the "set"
+    // function does not just flip the flag).
+    setLoggingInitialized(false);
+    EXPECT_FALSE(isLoggingInitialized());
+    setLoggingInitialized(false);
+    EXPECT_FALSE(isLoggingInitialized());
+
+    setLoggingInitialized(true);
+    EXPECT_TRUE(isLoggingInitialized());
+    setLoggingInitialized(true);
+    EXPECT_TRUE(isLoggingInitialized());
+
+    // Reset to original value
+    setLoggingInitialized(current_flag);
+}
+
+// Check that a logger will throw an exception if logging has not been
+// initialized.
+
+TEST_F(LoggerSupportTest, LoggingInitializationCheck) {
+
+    // Assert that logging has been initialized (it should be in main()).
+    bool current_flag = isLoggingInitialized();
+    EXPECT_TRUE(current_flag);
+
+    // Flag that it has not been initialized and declare a logger. Any logging
+    // operation should then throw.
+    setLoggingInitialized(false);
+    isc::log::Logger test_logger("test");
+
+    EXPECT_THROW(test_logger.isDebugEnabled(), LoggingNotInitialized);
+    EXPECT_THROW(test_logger.info(LOG_INPUT_OPEN_FAIL), LoggingNotInitialized);
+
+    // ... and check that they work when logging is initialized.
+    setLoggingInitialized(true);
+    EXPECT_NO_THROW(test_logger.isDebugEnabled());
+    EXPECT_NO_THROW(test_logger.info(LOG_INPUT_OPEN_FAIL).arg("foo").arg("bar"));
+}
diff --git a/src/lib/log/tests/logger_unittest.cc b/src/lib/log/tests/logger_unittest.cc
new file mode 100644
index 0000000..cc2fb95
--- /dev/null
+++ b/src/lib/log/tests/logger_unittest.cc
@@ -0,0 +1,508 @@
+// Copyright (C) 2011-2022 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 <gtest/gtest.h>
+
+#include <util/unittests/resource.h>
+#include <util/unittests/check_valgrind.h>
+
+#include <log/logger.h>
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_support.h>
+#include <log/log_messages.h>
+#include <log/interprocess/interprocess_sync_file.h>
+#include <log/output_option.h>
+#include <log/tests/log_test_messages.h>
+
+#include <iostream>
+#include <string>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+/// \brief Logger Test
+///
+/// As the logger is only a shell around the implementation, this tests also
+/// checks the logger implementation class as well.
+
+class LoggerTest : public ::testing::Test {
+public:
+    LoggerTest() {
+        // Initialize logging before each test, even if it is already done in main().
+        isc::log::initLogger();
+    }
+    ~LoggerTest() {
+        LoggerManager::reset();
+    }
+};
+
+// Check version
+
+TEST_F(LoggerTest, Version) {
+    EXPECT_NO_THROW(Logger::getVersion());
+}
+
+// Checks that the logger is named correctly.
+
+TEST_F(LoggerTest, Name) {
+
+    // Create a logger
+    Logger logger("alpha");
+
+    // ... and check the name
+    EXPECT_EQ(getRootLoggerName() + string(".alpha"), logger.getName());
+}
+
+// This test attempts to get two instances of a logger with the same name
+// and checks that they are in fact the same logger.
+
+TEST_F(LoggerTest, GetLogger) {
+
+    const char* name1 = "alpha";
+    const char* name2 = "beta";
+
+    // Instantiate two loggers that should be the same
+    Logger logger1(name1);
+    Logger logger2(name1);
+    // And check they equal
+    EXPECT_TRUE(logger1 == logger2);
+
+    // Instantiate another logger with another name and check that it
+    // is different to the previously instantiated ones.
+    Logger logger3(name2);
+    EXPECT_FALSE(logger1 == logger3);
+}
+
+// Check that the logger levels are get set properly.
+
+TEST_F(LoggerTest, Severity) {
+
+    // Create a logger
+    Logger logger("alpha");
+
+    // Now check the levels
+    logger.setSeverity(isc::log::NONE);
+    EXPECT_EQ(isc::log::NONE, logger.getSeverity());
+
+    logger.setSeverity(isc::log::FATAL);
+    EXPECT_EQ(isc::log::FATAL, logger.getSeverity());
+
+    logger.setSeverity(isc::log::ERROR);
+    EXPECT_EQ(isc::log::ERROR, logger.getSeverity());
+
+    logger.setSeverity(isc::log::WARN);
+    EXPECT_EQ(isc::log::WARN, logger.getSeverity());
+
+    logger.setSeverity(isc::log::INFO);
+    EXPECT_EQ(isc::log::INFO, logger.getSeverity());
+
+    logger.setSeverity(isc::log::DEBUG);
+    EXPECT_EQ(isc::log::DEBUG, logger.getSeverity());
+
+    logger.setSeverity(isc::log::DEFAULT);
+    EXPECT_EQ(isc::log::DEFAULT, logger.getSeverity());
+}
+
+// Check that the debug level is set correctly.
+
+TEST_F(LoggerTest, DebugLevels) {
+
+    // Create a logger
+    Logger logger("alpha");
+
+    // Debug level should be 0 if not at debug severity
+    logger.setSeverity(isc::log::NONE, 20);
+    EXPECT_EQ(0, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::INFO, 42);
+    EXPECT_EQ(0, logger.getDebugLevel());
+
+    // Should be the value set if the severity is set to DEBUG though.
+    logger.setSeverity(isc::log::DEBUG, 32);
+    EXPECT_EQ(32, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 97);
+    EXPECT_EQ(97, logger.getDebugLevel());
+
+    // Try the limits
+    logger.setSeverity(isc::log::DEBUG, -1);
+    EXPECT_EQ(0, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 0);
+    EXPECT_EQ(0, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 1);
+    EXPECT_EQ(1, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 98);
+    EXPECT_EQ(98, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 99);
+    EXPECT_EQ(99, logger.getDebugLevel());
+
+    logger.setSeverity(isc::log::DEBUG, 100);
+    EXPECT_EQ(99, logger.getDebugLevel());
+}
+
+// Check that changing the parent and child severity does not affect the
+// other.
+
+TEST_F(LoggerTest, SeverityInheritance) {
+
+    // Create two loggers.  We cheat here as we know that the underlying
+    // implementation will set a parent-child relationship if the loggers
+    // are named <parent> and <parent>.<child>.
+    Logger parent("alpha");
+    Logger child("alpha.beta");
+
+    // By default, newly created loggers should have a level of DEFAULT
+    // (i.e. default to parent)
+    EXPECT_EQ(isc::log::DEFAULT, parent.getSeverity());
+    EXPECT_EQ(isc::log::DEFAULT, child.getSeverity());
+
+    // Set the severity of the parent to debug and check what is
+    // reported by the child.
+    parent.setSeverity(isc::log::DEBUG, 42);
+    EXPECT_EQ(42, parent.getDebugLevel());
+    EXPECT_EQ(0,  child.getDebugLevel());
+    EXPECT_EQ(42, child.getEffectiveDebugLevel());
+
+    // Setting the child to DEBUG severity should set its own
+    // debug level.
+    child.setSeverity(isc::log::DEBUG, 53);
+    EXPECT_EQ(53,  child.getDebugLevel());
+    EXPECT_EQ(53, child.getEffectiveDebugLevel());
+
+    // If the child severity is set to something other than DEBUG,
+    // the debug level should be reported as 0.
+    child.setSeverity(isc::log::ERROR);
+    EXPECT_EQ(0,  child.getDebugLevel());
+    EXPECT_EQ(0, child.getEffectiveDebugLevel());
+}
+
+// Check that changing the parent and child debug level does not affect
+// the other.
+
+TEST_F(LoggerTest, DebugLevelInheritance) {
+
+    // Create two loggers.  We cheat here as we know that the underlying
+    // implementation will set a parent-child relationship if the loggers
+    // are named <parent> and <parent>.<child>.
+    Logger parent("alpha");
+    Logger child("alpha.beta");
+
+    // By default, newly created loggers should have a level of DEFAULT
+    // (i.e. default to parent)
+    EXPECT_EQ(isc::log::DEFAULT, parent.getSeverity());
+    EXPECT_EQ(isc::log::DEFAULT, child.getSeverity());
+
+    // Set the severity of the child to something other than the default -
+    // check it changes and that of the parent does not.
+    child.setSeverity(isc::log::INFO);
+    EXPECT_EQ(isc::log::DEFAULT, parent.getSeverity());
+    EXPECT_EQ(isc::log::INFO, child.getSeverity());
+
+    // Reset the child severity and set that of the parent
+    child.setSeverity(isc::log::DEFAULT);
+    EXPECT_EQ(isc::log::DEFAULT, parent.getSeverity());
+    EXPECT_EQ(isc::log::DEFAULT, child.getSeverity());
+    parent.setSeverity(isc::log::WARN);
+    EXPECT_EQ(isc::log::WARN, parent.getSeverity());
+    EXPECT_EQ(isc::log::DEFAULT, child.getSeverity());
+}
+
+// Check that severity is inherited.
+
+TEST_F(LoggerTest, EffectiveSeverityInheritance) {
+
+    // Create two loggers.  We cheat here as we know that the underlying
+    // implementation will set a parent-child relationship if the loggers
+    // are named <parent> and <parent>.<child>.
+    Logger parent("test6");
+    Logger child("test6.beta");
+
+    // By default, newly created loggers should have a level of DEFAULT
+    // (i.e. default to parent) and the root should have a default severity
+    // of INFO.  However, the latter is only enforced when created by the
+    // RootLogger class, so explicitly set it for the parent for now.
+    parent.setSeverity(isc::log::INFO);
+    EXPECT_EQ(isc::log::INFO, parent.getEffectiveSeverity());
+
+    EXPECT_EQ(isc::log::DEFAULT, child.getSeverity());
+    EXPECT_EQ(isc::log::INFO, child.getEffectiveSeverity());
+
+    // Set the severity of the child to something other than the default -
+    // check it changes and that of the parent does not.
+    child.setSeverity(isc::log::FATAL);
+    EXPECT_EQ(isc::log::INFO, parent.getEffectiveSeverity());
+    EXPECT_EQ(isc::log::FATAL, child.getEffectiveSeverity());
+
+    // Reset the child severity and check again.
+    child.setSeverity(isc::log::DEFAULT);
+    EXPECT_EQ(isc::log::INFO, parent.getEffectiveSeverity());
+    EXPECT_EQ(isc::log::INFO, child.getEffectiveSeverity());
+
+    // Change the parent's severity and check it is reflects in the child.
+    parent.setSeverity(isc::log::WARN);
+    EXPECT_EQ(isc::log::WARN, parent.getEffectiveSeverity());
+    EXPECT_EQ(isc::log::WARN, child.getEffectiveSeverity());
+}
+
+// Test the isXxxxEnabled methods.
+
+TEST_F(LoggerTest, IsXxxEnabled) {
+
+    Logger logger("test7");
+
+    logger.setSeverity(isc::log::INFO);
+    EXPECT_FALSE(logger.isDebugEnabled());
+    EXPECT_TRUE(logger.isInfoEnabled());
+    EXPECT_TRUE(logger.isWarnEnabled());
+    EXPECT_TRUE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    logger.setSeverity(isc::log::WARN);
+    EXPECT_FALSE(logger.isDebugEnabled());
+    EXPECT_FALSE(logger.isInfoEnabled());
+    EXPECT_TRUE(logger.isWarnEnabled());
+    EXPECT_TRUE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    logger.setSeverity(isc::log::ERROR);
+    EXPECT_FALSE(logger.isDebugEnabled());
+    EXPECT_FALSE(logger.isInfoEnabled());
+    EXPECT_FALSE(logger.isWarnEnabled());
+    EXPECT_TRUE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    logger.setSeverity(isc::log::FATAL);
+    EXPECT_FALSE(logger.isDebugEnabled());
+    EXPECT_FALSE(logger.isInfoEnabled());
+    EXPECT_FALSE(logger.isWarnEnabled());
+    EXPECT_FALSE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    // Check various debug levels
+
+    logger.setSeverity(isc::log::DEBUG);
+    EXPECT_TRUE(logger.isDebugEnabled());
+    EXPECT_TRUE(logger.isInfoEnabled());
+    EXPECT_TRUE(logger.isWarnEnabled());
+    EXPECT_TRUE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    logger.setSeverity(isc::log::DEBUG, 45);
+    EXPECT_TRUE(logger.isDebugEnabled());
+    EXPECT_TRUE(logger.isInfoEnabled());
+    EXPECT_TRUE(logger.isWarnEnabled());
+    EXPECT_TRUE(logger.isErrorEnabled());
+    EXPECT_TRUE(logger.isFatalEnabled());
+
+    // Create a child logger with no severity set, and check that it reflects
+    // the severity of the parent logger.
+
+    Logger child("test7.child");
+    logger.setSeverity(isc::log::FATAL);
+    EXPECT_FALSE(child.isDebugEnabled());
+    EXPECT_FALSE(child.isInfoEnabled());
+    EXPECT_FALSE(child.isWarnEnabled());
+    EXPECT_FALSE(child.isErrorEnabled());
+    EXPECT_TRUE(child.isFatalEnabled());
+
+    logger.setSeverity(isc::log::INFO);
+    EXPECT_FALSE(child.isDebugEnabled());
+    EXPECT_TRUE(child.isInfoEnabled());
+    EXPECT_TRUE(child.isWarnEnabled());
+    EXPECT_TRUE(child.isErrorEnabled());
+    EXPECT_TRUE(child.isFatalEnabled());
+}
+
+// Within the Debug level there are 100 debug levels.  Test that we know
+// when to issue a debug message.
+
+TEST_F(LoggerTest, IsDebugEnabledLevel) {
+
+    Logger logger("test8");
+
+    int MID_LEVEL = (MIN_DEBUG_LEVEL + MAX_DEBUG_LEVEL) / 2;
+
+    logger.setSeverity(isc::log::DEBUG);
+    EXPECT_TRUE(logger.isDebugEnabled(MIN_DEBUG_LEVEL));
+    EXPECT_FALSE(logger.isDebugEnabled(MID_LEVEL));
+    EXPECT_FALSE(logger.isDebugEnabled(MAX_DEBUG_LEVEL));
+
+    logger.setSeverity(isc::log::DEBUG, MIN_DEBUG_LEVEL);
+    EXPECT_TRUE(logger.isDebugEnabled(MIN_DEBUG_LEVEL));
+    EXPECT_FALSE(logger.isDebugEnabled(MID_LEVEL));
+    EXPECT_FALSE(logger.isDebugEnabled(MAX_DEBUG_LEVEL));
+
+    logger.setSeverity(isc::log::DEBUG, MID_LEVEL);
+    EXPECT_TRUE(logger.isDebugEnabled(MIN_DEBUG_LEVEL));
+    EXPECT_TRUE(logger.isDebugEnabled(MID_LEVEL - 1));
+    EXPECT_TRUE(logger.isDebugEnabled(MID_LEVEL));
+    EXPECT_FALSE(logger.isDebugEnabled(MID_LEVEL + 1));
+    EXPECT_FALSE(logger.isDebugEnabled(MAX_DEBUG_LEVEL));
+
+    logger.setSeverity(isc::log::DEBUG, MAX_DEBUG_LEVEL);
+    EXPECT_TRUE(logger.isDebugEnabled(MIN_DEBUG_LEVEL));
+    EXPECT_TRUE(logger.isDebugEnabled(MID_LEVEL));
+    EXPECT_TRUE(logger.isDebugEnabled(MAX_DEBUG_LEVEL));
+}
+
+// Check that loggers with invalid names give an error.
+
+TEST_F(LoggerTest, LoggerNameLength) {
+    // Null name
+    EXPECT_THROW(Logger(NULL), LoggerNameNull);
+
+    // Declare space for the logger name.  The length of names checked
+    // will range from 0 through MAX_LOGGER_NAME_SIZE + 1: to allow for
+    // the trailing null, at least one more byte than the longest name size
+    // must be reserved.
+    char name[Logger::MAX_LOGGER_NAME_SIZE + 2];
+
+    // Zero-length name should throw an exception
+    name[0] = '\0';
+    EXPECT_THROW({
+            Logger dummy(name);
+            }, LoggerNameError);
+
+    // Work through all valid names.
+    for (size_t i = 0; i < Logger::MAX_LOGGER_NAME_SIZE; ++i) {
+
+        // Append a character to the name and check that a logger with that
+        // name can be created without throwing an exception.
+        name[i] = 'X';
+        name[i + 1] = '\0';
+        EXPECT_NO_THROW({
+                Logger dummy(name);
+                }) << "Size of logger name is " << (i + 1);
+    }
+
+    // ... and check that an overly long name throws an exception.
+    name[Logger::MAX_LOGGER_NAME_SIZE] = 'X';
+    name[Logger::MAX_LOGGER_NAME_SIZE + 1] = '\0';
+    EXPECT_THROW({
+            Logger dummy(name);
+            }, LoggerNameError);
+
+}
+
+TEST_F(LoggerTest, setInterprocessSync) {
+    // Create a logger
+    Logger logger("alpha");
+
+    EXPECT_THROW(logger.setInterprocessSync(NULL), BadInterprocessSync);
+}
+
+class MockSync : public isc::log::interprocess::InterprocessSync {
+public:
+    /// \brief Constructor
+    MockSync(const std::string& component_name) :
+        InterprocessSync(component_name), was_locked_(false),
+        was_unlocked_(false)
+    {}
+
+    bool wasLocked() const {
+        return (was_locked_);
+    }
+
+    bool wasUnlocked() const {
+        return (was_unlocked_);
+    }
+
+protected:
+    bool lock() {
+        was_locked_ = true;
+        return (true);
+    }
+
+    bool tryLock() {
+        return (true);
+    }
+
+    bool unlock() {
+        was_unlocked_ = true;
+        return (true);
+    }
+
+private:
+    bool was_locked_;
+    bool was_unlocked_;
+};
+
+// Checks that the logger logs exclusively and other Kea components
+// are locked out.
+
+TEST_F(LoggerTest, Lock) {
+    // Create a logger
+    Logger logger("alpha");
+
+    // Setup our own mock sync object so that we can intercept the lock
+    // call and check if a lock has been taken.
+    MockSync* sync = new MockSync("logger");
+    logger.setInterprocessSync(sync);
+
+    // Log a message and put things into play.
+    logger.setSeverity(isc::log::INFO, 100);
+    logger.info(LOG_LOCK_TEST_MESSAGE);
+
+    EXPECT_TRUE(sync->wasLocked());
+    EXPECT_TRUE(sync->wasUnlocked());
+}
+
+// Checks that hasAppender() reports
+TEST_F(LoggerTest, HasAppender) {
+    // Create a logger.
+    Logger logger("logger");
+
+    // By default, loggers have a file appender to /dev/null.
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_CONSOLE));
+    EXPECT_TRUE(logger.hasAppender(OutputOption::DEST_FILE));
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_SYSLOG));
+
+    // -- Create some specifications. --
+
+    OutputOption console;
+    console.destination = OutputOption::DEST_CONSOLE;
+    LoggerSpecification spec_console("logger");
+    spec_console.addOutputOption(console);
+
+    OutputOption file;
+    file.destination = OutputOption::DEST_FILE;
+    file.filename = "/dev/null";
+    LoggerSpecification spec_file("logger");
+    spec_file.addOutputOption(file);
+
+    OutputOption syslog;
+    syslog.destination = OutputOption::DEST_SYSLOG;
+    LoggerSpecification spec_syslog("logger");
+    spec_syslog.addOutputOption(syslog);
+
+    LoggerManager manager;
+
+    // Check console.
+    manager.process(spec_console);
+    EXPECT_TRUE(logger.hasAppender(OutputOption::DEST_CONSOLE));
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_FILE));
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_SYSLOG));
+
+    // Check file.
+    manager.process(spec_file);
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_CONSOLE));
+    EXPECT_TRUE(logger.hasAppender(OutputOption::DEST_FILE));
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_SYSLOG));
+
+    // Check syslog.
+    manager.process(spec_syslog);
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_CONSOLE));
+    EXPECT_FALSE(logger.hasAppender(OutputOption::DEST_FILE));
+    EXPECT_TRUE(logger.hasAppender(OutputOption::DEST_SYSLOG));
+}
diff --git a/src/lib/log/tests/message_dictionary_unittest.cc b/src/lib/log/tests/message_dictionary_unittest.cc
new file mode 100644
index 0000000..8613393
--- /dev/null
+++ b/src/lib/log/tests/message_dictionary_unittest.cc
@@ -0,0 +1,219 @@
+// 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 <cstddef>
+#include <string>
+#include <gtest/gtest.h>
+#include <log/message_dictionary.h>
+#include <log/message_initializer.h>
+#include <log/message_types.h>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+// set up another message initializer.  This will add a symbol found in the
+// logging library and a symbol not found in the logging library.  When the
+// global dictionary is loaded, the former should be marked as a duplicate
+// and the latter should be present.
+
+namespace {
+const char* values[] = {
+    // This message for DUPLICATE_NAMESPACE must be copied from
+    // ../log_messages.mes; otherwise logger check might fail.
+    "LOG_DUPLICATE_NAMESPACE", "line %1: duplicate $NAMESPACE directive found",
+    "NEWSYM", "new symbol added",
+    NULL
+};
+
+MessageInitializer init(values);
+}
+
+class MessageDictionaryTest : public ::testing::Test {
+protected:
+    MessageDictionaryTest() :
+        alpha_id("ALPHA"), alpha_text("This is alpha"),
+        beta_id("BETA"), beta_text("This is beta"),
+        gamma_id("GAMMA"), gamma_text("This is gamma")
+    {
+    }
+
+    MessageID alpha_id;
+    std::string alpha_text;
+    MessageID beta_id;
+    std::string beta_text;
+    MessageID gamma_id;
+    std::string gamma_text;
+
+};
+
+// Check that adding messages works
+
+TEST_F(MessageDictionaryTest, Add) {
+    MessageDictionary dictionary;
+    EXPECT_EQ(0, dictionary.size());
+
+    // Add a few messages and check that we can look them up and that there is
+    // nothing in the overflow vector.
+    EXPECT_TRUE(dictionary.add(alpha_id, alpha_text));
+    EXPECT_TRUE(dictionary.add(beta_id, beta_text));
+    EXPECT_EQ(2, dictionary.size());
+
+    EXPECT_EQ(alpha_text, dictionary.getText(alpha_id));
+    EXPECT_EQ(beta_text, dictionary.getText(beta_id));
+    EXPECT_EQ(string(""), dictionary.getText(gamma_id));
+
+    // Try adding a duplicate with different text.  It should not replace the
+    // current text and the ID should be in the overflow section.
+    EXPECT_FALSE(dictionary.add(alpha_id, gamma_text));
+    EXPECT_EQ(2, dictionary.size());
+}
+
+// Check that replacing messages works.
+
+TEST_F(MessageDictionaryTest, Replace) {
+    MessageDictionary dictionary;
+    EXPECT_EQ(0, dictionary.size());
+
+    // Try to replace a non-existent message
+    EXPECT_FALSE(dictionary.replace(alpha_id, alpha_text));
+    EXPECT_EQ(0, dictionary.size());
+
+    // Add a couple of messages.
+    EXPECT_TRUE(dictionary.add(alpha_id, alpha_text));
+    EXPECT_TRUE(dictionary.add(beta_id, beta_text));
+    EXPECT_EQ(2, dictionary.size());
+
+    // Replace an existing message
+    EXPECT_TRUE(dictionary.replace(alpha_id, gamma_text));
+    EXPECT_EQ(2, dictionary.size());
+    EXPECT_EQ(gamma_text, dictionary.getText(alpha_id));
+
+    // ... and replace non-existent message (but now the dictionary has some
+    // items in it).
+    EXPECT_FALSE(dictionary.replace(gamma_id, alpha_text));
+    EXPECT_EQ(2, dictionary.size());
+    EXPECT_EQ(string(""), dictionary.getText(gamma_id));
+}
+
+// Check that removing message works.
+
+TEST_F(MessageDictionaryTest, erase) {
+    MessageDictionary dictionary;
+    ASSERT_NO_THROW(dictionary.erase(alpha_id, alpha_text));
+    ASSERT_EQ(0, dictionary.size());
+
+    // Add a couple of messages.
+    EXPECT_TRUE(dictionary.add(alpha_id, alpha_text));
+    EXPECT_TRUE(dictionary.add(beta_id, beta_text));
+    // There is no sense to continue if messages haven't been added.
+    ASSERT_EQ(2, dictionary.size());
+
+    // Remove one with the existing ID, but non-matching text. It
+    // should not remove any message.
+    EXPECT_FALSE(dictionary.erase(beta_id, alpha_text));
+
+    // Now, remove the message with matching ID and text.
+    EXPECT_TRUE(dictionary.erase(beta_id, beta_text));
+    EXPECT_EQ(1, dictionary.size());
+    // The other entry should still exist.
+    EXPECT_EQ(alpha_text, dictionary.getText(alpha_id));
+
+    // And remove the other message.
+    EXPECT_TRUE(dictionary.erase(alpha_id, alpha_text));
+    EXPECT_EQ(0, dictionary.size());
+}
+
+// Load test
+
+TEST_F(MessageDictionaryTest, LoadTest) {
+    static const char* data1[] = {
+        "ALPHA", "This is alpha",
+        "BETA", "This is beta",
+        "GAMMA", "This is gamma",
+        NULL
+    };
+
+    static const char* data2[] = {
+        "DELTA", "This is delta",
+        "EPSILON", "This is epsilon",
+        "ETA", NULL
+    };
+
+    MessageDictionary dictionary1;
+    EXPECT_EQ(0, dictionary1.size());
+
+    // Load a dictionary1.
+    vector<string> duplicates = dictionary1.load(data1);
+    EXPECT_EQ(3, dictionary1.size());
+    EXPECT_EQ(string(data1[1]), dictionary1.getText(data1[0]));
+    EXPECT_EQ(string(data1[3]), dictionary1.getText(data1[2]));
+    EXPECT_EQ(string(data1[5]), dictionary1.getText(data1[4]));
+    EXPECT_EQ(0, duplicates.size());
+
+    // Attempt an overwrite
+    duplicates = dictionary1.load(data1);
+    EXPECT_EQ(3, dictionary1.size());
+    EXPECT_EQ(3, duplicates.size());
+
+    // Try a new dictionary but with an incorrect number of elements
+    MessageDictionary dictionary2;
+    EXPECT_EQ(0, dictionary2.size());
+
+    duplicates = dictionary2.load(data2);
+    EXPECT_EQ(2, dictionary2.size());
+    EXPECT_EQ(string(data2[1]), dictionary2.getText(data2[0]));
+    EXPECT_EQ(string(data2[3]), dictionary2.getText(data2[2]));
+    EXPECT_EQ(string(""), dictionary2.getText(data2[4]));
+    EXPECT_EQ(0, duplicates.size());
+}
+
+// Check for some non-existent items
+
+TEST_F(MessageDictionaryTest, Lookups) {
+    static const char* data[] = {
+        "ALPHA", "This is alpha",
+        "BETA", "This is beta",
+        "GAMMA", "This is gamma",
+        NULL
+    };
+
+    MessageDictionary dictionary;
+    vector<string> duplicates = dictionary.load(data);
+    EXPECT_EQ(3, dictionary.size());
+    EXPECT_EQ(0, duplicates.size());
+
+    // Valid lookups
+    EXPECT_EQ(string("This is alpha"), dictionary.getText("ALPHA"));
+    EXPECT_EQ(string("This is beta"), dictionary.getText("BETA"));
+    EXPECT_EQ(string("This is gamma"), dictionary.getText("GAMMA"));
+
+    // ... and invalid ones
+    EXPECT_EQ(string(""), dictionary.getText("XYZZY"));
+    EXPECT_EQ(string(""), dictionary.getText(""));
+    EXPECT_EQ(string(""), dictionary.getText("\n\n\n"));
+}
+
+// Check that the global dictionary is a singleton.
+
+TEST_F(MessageDictionaryTest, GlobalTest) {
+    const MessageDictionaryPtr& global = MessageDictionary::globalDictionary();
+    const MessageDictionaryPtr& global2 = MessageDictionary::globalDictionary();
+    EXPECT_TRUE(global2 == global);
+}
+
+// Check that the global dictionary has detected the duplicate and the
+// new symbol.
+
+TEST_F(MessageDictionaryTest, GlobalLoadTest) {
+    // There were duplicates but the vector should be cleared in init() now
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+
+    string text = MessageDictionary::globalDictionary()->getText("NEWSYM");
+    EXPECT_EQ(string("new symbol added"), text);
+}
diff --git a/src/lib/log/tests/message_initializer_1_unittest.cc b/src/lib/log/tests/message_initializer_1_unittest.cc
new file mode 100644
index 0000000..c34139a
--- /dev/null
+++ b/src/lib/log/tests/message_initializer_1_unittest.cc
@@ -0,0 +1,251 @@
+// Copyright (C) 2012-2020 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 <log/message_dictionary.h>
+#include <log/message_initializer.h>
+#include <boost/lexical_cast.hpp>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+// Declare a set of messages to go into the global dictionary.
+
+namespace {
+const char* values1[] = {
+    "GLOBAL1", "global message one",
+    "GLOBAL2", "global message two",
+    NULL
+};
+
+const char* values2[] = {
+    "GLOBAL3", "global message three",
+    "GLOBAL4", "global message four",
+    NULL
+};
+
+const char* values3[] = {
+    "GLOBAL7", "global message seven",
+    "GLOBAL8", "global message eight",
+    NULL
+};
+
+const char* values4[] = {
+    "GLOBAL8", "global message eight",
+    "GLOBAL9", "global message nine",
+    NULL
+};
+
+/// @brief Scoped pointer to the @c MessageInitializer object.
+typedef boost::scoped_ptr<MessageInitializer> MessageInitializerPtr;
+
+}
+
+// Statically initialize the global dictionary with those messages.  Three sets
+// are used to check that the declaration of separate initializer objects
+// really does combine the messages. (The third set - declaring message IDs
+// GLOBAL5 and GLOBAL6) is declared in the separately-compiled file,
+// message_identifier_initializer_1a_unittest.cc.)
+
+const MessageInitializer init_message_initializer_unittest_1(values1);
+const MessageInitializer init_message_initializer_unittest_2(values2);
+
+// Check that the global dictionary is initialized with the specified
+// messages.
+
+namespace {
+void
+messageTest() {
+    static bool done = false;
+
+    // Execute once.
+    if (done) {
+        return;
+    } else {
+        done = true;
+    }
+
+    const MessageDictionaryPtr& global = MessageDictionary::globalDictionary();
+
+    // Pointers to the message arrays should have been stored, but none of the
+    // messages should yet be in the dictionary.
+    for (int i = 1; i <= 6; ++i) {
+        string symbol = string("GLOBAL") + boost::lexical_cast<std::string>(i);
+        EXPECT_EQ(string(""), global->getText(symbol));
+    }
+
+    // Load the dictionary - this should clear the message array pending count.
+    // (N.B. We do not check for a known value before the call, only that the
+    // value is not zero.  This is because libraries against which the test
+    // is linked may have registered their own message arrays.)
+    EXPECT_NE(0, MessageInitializer::getPendingCount());
+    MessageInitializer::loadDictionary();
+    EXPECT_EQ(0, MessageInitializer::getPendingCount());
+
+    // ... and check the messages loaded.
+    EXPECT_EQ(string("global message one"), global->getText("GLOBAL1"));
+    EXPECT_EQ(string("global message two"), global->getText("GLOBAL2"));
+    EXPECT_EQ(string("global message three"), global->getText("GLOBAL3"));
+    EXPECT_EQ(string("global message four"), global->getText("GLOBAL4"));
+    EXPECT_EQ(string("global message five"), global->getText("GLOBAL5"));
+    EXPECT_EQ(string("global message six"), global->getText("GLOBAL6"));
+}
+}
+
+// Check that destroying the MessageInitializer causes the relevant
+// messages to be removed from the dictionary.
+
+TEST(MessageInitializerTest1, dynamicLoadUnload) {
+    // Try first messageTest.
+    messageTest();
+
+    // Obtain the instance of the global dictionary.
+    const MessageDictionaryPtr& global = MessageDictionary::globalDictionary();
+
+    // Dynamically create the first initializer.
+    MessageInitializerPtr init1(new MessageInitializer(values3));
+    EXPECT_EQ(1, MessageInitializer::getPendingCount());
+
+    // Dynamically create the second initializer.
+    MessageInitializerPtr init2(new MessageInitializer(values4));
+    EXPECT_EQ(2, MessageInitializer::getPendingCount());
+
+    // Load messages from both initializers to the global dictionary.
+    MessageInitializer::loadDictionary();
+    // There should be no pending messages.
+    EXPECT_EQ(0, MessageInitializer::getPendingCount());
+
+    // Make sure that the messages have been loaded.
+    EXPECT_EQ("global message seven", global->getText("GLOBAL7"));
+    EXPECT_EQ("global message eight", global->getText("GLOBAL8"));
+    EXPECT_EQ("global message nine", global->getText("GLOBAL9"));
+
+    // Destroy the first initializer. The first message should be removed.
+    // The second message should not be removed because it is also held
+    // by another object.
+    init1.reset();
+    EXPECT_TRUE(global->getText("GLOBAL7").empty());
+    EXPECT_EQ("global message eight", global->getText("GLOBAL8"));
+    EXPECT_EQ("global message nine", global->getText("GLOBAL9"));
+
+    // Destroy the second initializer. Now, all messages should be
+    // unregistered.
+    init2.reset();
+    EXPECT_TRUE(global->getText("GLOBAL7").empty());
+    EXPECT_TRUE(global->getText("GLOBAL8").empty());
+    EXPECT_TRUE(global->getText("GLOBAL9").empty());
+}
+
+// Check that destroying the MessageInitializer removes pending messages.
+
+TEST(MessageInitializerTest1, dynamicUnloadPending) {
+    // Try first messageTest.
+    messageTest();
+
+    // Obtain the instance of the global dictionary.
+    const MessageDictionaryPtr& global = MessageDictionary::globalDictionary();
+
+    // Dynamically create the first initializer.
+    MessageInitializerPtr init1(new MessageInitializer(values3));
+    ASSERT_EQ(1, MessageInitializer::getPendingCount());
+
+    // Create second initializer without committing the first set
+    // of messages to the dictionary.
+    MessageInitializerPtr init2(new MessageInitializer(values4));
+    ASSERT_EQ(2, MessageInitializer::getPendingCount());
+
+    // Destroy the first initializer and make sure that the number of
+    // pending message sets drops to 1.
+    init1.reset();
+    ASSERT_EQ(1, MessageInitializer::getPendingCount());
+
+    // Now destroy the second initializer and make sure that there are
+    // no pending messages.
+    init2.reset();
+    ASSERT_EQ(0, MessageInitializer::getPendingCount());
+
+    init1.reset(new MessageInitializer(values3));
+    ASSERT_EQ(1, MessageInitializer::getPendingCount());
+
+    // Load the messages to the dictionary and make sure there are no pending
+    // messages.
+    MessageInitializer::loadDictionary();
+    EXPECT_EQ(0, MessageInitializer::getPendingCount());
+
+    // Create the second initializer. There should be one pending set of
+    // messages.
+    init2.reset(new MessageInitializer(values4));
+    ASSERT_EQ(1, MessageInitializer::getPendingCount());
+
+    // Make sure that the messages defined by the first initializer
+    // are in the dictionary.
+    ASSERT_EQ("global message seven", global->getText("GLOBAL7"));
+    ASSERT_EQ("global message eight", global->getText("GLOBAL8"));
+    ASSERT_TRUE(global->getText("GLOBAL9").empty());
+
+    // Destroy the second initializer. There should be no pending messages
+    // now.
+    init2.reset();
+    ASSERT_EQ(0, MessageInitializer::getPendingCount());
+
+    // Loading the messages should be no-op.
+    MessageInitializer::loadDictionary();
+    ASSERT_EQ(0, MessageInitializer::getPendingCount());
+
+    // Make sure that the messages loaded from the first initializer
+    // are not affected.
+    ASSERT_EQ("global message seven", global->getText("GLOBAL7"));
+    ASSERT_EQ("global message eight", global->getText("GLOBAL8"));
+    ASSERT_TRUE(global->getText("GLOBAL9").empty());
+
+    // And remove them.
+    init1.reset();
+    EXPECT_TRUE(global->getText("GLOBAL7").empty());
+    EXPECT_TRUE(global->getText("GLOBAL8").empty());
+    EXPECT_TRUE(global->getText("GLOBAL9").empty());
+}
+
+TEST(MessageInitializerTest1, duplicates) {
+    // Try first messageTest.
+    messageTest();
+
+    // Original set should not have dupes
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+
+    // This just defines 1, but we'll add it a number of times
+    const char* dupe[] = {
+        "DUPE", "dupe",
+        NULL
+    };
+    const MessageInitializer init_message_initializer_unittest_1(dupe);
+    const MessageInitializer init_message_initializer_unittest_2(dupe);
+
+    MessageInitializer::loadDictionary();
+    // Should be a dupe now
+    ASSERT_EQ(1, MessageInitializer::getDuplicates().size());
+
+    // clear them
+    MessageInitializer::clearDuplicates();
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+
+    // Do it again to make sure, let's explicitly provide false now
+    const MessageInitializer init_message_initializer_unittest_3(dupe);
+    MessageInitializer::loadDictionary(false);
+    ASSERT_EQ(1, MessageInitializer::getDuplicates().size());
+
+    // Loading with ignore_duplicates=true should result in no (reported)
+    // dupes
+    MessageInitializer::clearDuplicates();
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+    const MessageInitializer init_message_initializer_unittest_4(dupe);
+    MessageInitializer::loadDictionary(true);
+    ASSERT_EQ(0, MessageInitializer::getDuplicates().size());
+}
diff --git a/src/lib/log/tests/message_initializer_1a_unittest.cc b/src/lib/log/tests/message_initializer_1a_unittest.cc
new file mode 100644
index 0000000..3e2b86b
--- /dev/null
+++ b/src/lib/log/tests/message_initializer_1a_unittest.cc
@@ -0,0 +1,31 @@
+// Copyright (C) 2012-2015 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/.
+
+// The sole purpose of this file is to provide a set of message definitions
+// in a separate compilation unit from the one in which their presence is
+// checked.  This tests that merely declaring the MessageInitializer object
+// is enough to include the definitions in the global dictionary.
+
+#include <config.h>
+
+#include <log/message_initializer.h>
+
+using namespace isc::log;
+
+// Declare a set of messages to go into the global dictionary.
+
+namespace {
+
+const char* values3[] = {
+    "GLOBAL5", "global message five",
+    "GLOBAL6", "global message six",
+    NULL
+};
+
+}
+
+// Register the messages for loading into the global dictionary
+const MessageInitializer init_message_initializer_unittest_3(values3);
diff --git a/src/lib/log/tests/message_reader_unittest.cc b/src/lib/log/tests/message_reader_unittest.cc
new file mode 100644
index 0000000..4dd6435
--- /dev/null
+++ b/src/lib/log/tests/message_reader_unittest.cc
@@ -0,0 +1,269 @@
+// Copyright (C) 2011-2020 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 <algorithm>
+#include <string>
+#include <gtest/gtest.h>
+
+#include <log/log_messages.h>
+#include <log/message_dictionary.h>
+#include <log/message_exception.h>
+#include <log/message_reader.h>
+
+using namespace isc;
+using namespace isc::log;
+using namespace std;
+
+class MessageReaderTest : public ::testing::Test {
+protected:
+    MessageReaderTest() : dictionary_(), reader_()
+    {
+        dictionary_ = new MessageDictionary();
+        reader_.setDictionary(dictionary_);
+    }
+
+    ~MessageReaderTest() {
+        delete dictionary_;
+    }
+
+    MessageDictionary*  dictionary_;    // Dictionary to add messages to
+    MessageReader       reader_;        // Default reader object
+};
+
+
+// Check the get/set dictionary calls (using a local reader and dictionary).
+
+TEST_F(MessageReaderTest, GetSetDictionary) {
+    MessageReader reader;
+    EXPECT_TRUE(reader.getDictionary() == NULL);
+
+    MessageDictionary dictionary;
+    reader.setDictionary(&dictionary);
+    EXPECT_EQ(&dictionary, reader.getDictionary());
+}
+
+// Check for parsing blank lines and comments.  These should not add to the
+// dictionary and each parse should return success.
+
+TEST_F(MessageReaderTest, BlanksAndComments) {
+
+    // Ensure that the dictionary is empty.
+    EXPECT_EQ(0, dictionary_->size());
+
+    // Add a number of blank lines and comments and check that (a) they are
+    // parsed successfully ...
+    EXPECT_NO_THROW(reader_.processLine(""));
+    EXPECT_NO_THROW(reader_.processLine(" "));
+    EXPECT_NO_THROW(reader_.processLine(" \n "));
+    EXPECT_NO_THROW(reader_.processLine("# This is a comment"));
+    EXPECT_NO_THROW(reader_.processLine("\t\t # Another comment"));
+    EXPECT_NO_THROW(reader_.processLine("  A description line"));
+    EXPECT_NO_THROW(reader_.processLine("# A comment"));
+    EXPECT_NO_THROW(reader_.processLine("  +# A description line"));
+
+    // ... and (b) nothing gets added to either the map or the not-added section.
+    EXPECT_EQ(0, dictionary_->size());
+    vector<string> not_added = reader_.getNotAdded();
+    EXPECT_EQ(0, not_added.size());
+}
+
+
+// Local test to check that processLine generates the right exception.
+
+void
+processLineException(MessageReader& reader, const char* what,
+    const MessageID& expected) {
+
+    try {
+        reader.processLine(what);
+        FAIL() << "MessageReader::processLine() should throw an exception " <<
+            " with message ID " << expected << " for '" << what << "'\n";
+    } catch (const MessageException& e) {
+        EXPECT_EQ(boost::lexical_cast<string>(expected),
+            boost::lexical_cast<string>(e.id()));
+    } catch (...) {
+        FAIL() << "Unknown exception thrown by MessageReader::processLine()\n";
+    }
+}
+
+// Check that it recognizes invalid directives
+
+TEST_F(MessageReaderTest, InvalidDirectives) {
+
+    // Check that a "$" with nothing else generates an error
+    processLineException(reader_, "$", LOG_UNRECOGNIZED_DIRECTIVE);
+    processLineException(reader_, "$xyz", LOG_UNRECOGNIZED_DIRECTIVE);
+}
+
+// Check that it can parse a prefix
+
+TEST_F(MessageReaderTest, Prefix) {
+
+    // Check that no $PREFIX is present
+    EXPECT_EQ(string(""), reader_.getPrefix());
+
+    // Check that a $PREFIX directive with no argument is OK
+    EXPECT_NO_THROW(reader_.processLine("$PREFIX"));
+
+    // Check a $PREFIX with multiple arguments is invalid
+    processLineException(reader_, "$prefix A B", LOG_PREFIX_EXTRA_ARGS);
+
+    // Prefixes should be alphanumeric (with underscores) and not start
+    // with a number.
+    processLineException(reader_, "$prefix ab[cd", LOG_PREFIX_INVALID_ARG);
+    processLineException(reader_, "$prefix 123", LOG_PREFIX_INVALID_ARG);
+    processLineException(reader_, "$prefix 1ABC", LOG_PREFIX_INVALID_ARG);
+
+    // A valid prefix should be accepted
+    EXPECT_NO_THROW(reader_.processLine("$PREFIX   dlm__"));
+    EXPECT_EQ(string("dlm__"), reader_.getPrefix());
+
+    // And check that the parser fails on invalid prefixes...
+    processLineException(reader_, "$prefix 1ABC", LOG_PREFIX_INVALID_ARG);
+
+    // Check that we can clear the prefix as well
+    reader_.clearPrefix();
+    EXPECT_EQ(string(""), reader_.getPrefix());
+
+    EXPECT_NO_THROW(reader_.processLine("$PREFIX   dlm__"));
+    EXPECT_EQ(string("dlm__"), reader_.getPrefix());
+    EXPECT_NO_THROW(reader_.processLine("$PREFIX"));
+    EXPECT_EQ(string(""), reader_.getPrefix());
+}
+
+// Check that it can parse a namespace
+
+TEST_F(MessageReaderTest, Namespace) {
+
+    // Check that no $NAMESPACE is present
+    EXPECT_EQ(string(""), reader_.getNamespace());
+
+    // Check that a $NAMESPACE directive with no argument generates an error.
+    processLineException(reader_, "$NAMESPACE", LOG_NAMESPACE_NO_ARGS);
+
+    // Check a $NAMESPACE with multiple arguments is invalid
+    processLineException(reader_, "$namespace A B", LOG_NAMESPACE_EXTRA_ARGS);
+
+    // Namespaces should be alphanumeric (with underscores and colons)
+    processLineException(reader_, "$namespace ab[cd", LOG_NAMESPACE_INVALID_ARG);
+
+    // A valid $NAMESPACE should be accepted
+    EXPECT_NO_THROW(reader_.processLine("$NAMESPACE isc"));
+    EXPECT_EQ(string("isc"), reader_.getNamespace());
+
+    // (Check that we can clear the namespace)
+    reader_.clearNamespace();
+    EXPECT_EQ(string(""), reader_.getNamespace());
+
+    // Check that a valid namespace can include colons
+    EXPECT_NO_THROW(reader_.processLine("$NAMESPACE isc::log"));
+    EXPECT_EQ(string("isc::log"), reader_.getNamespace());
+
+    // Check that the indication of the anonymous namespace will be recognized.
+    reader_.clearNamespace();
+    EXPECT_NO_THROW(reader_.processLine("$NAMESPACE ::"));
+    EXPECT_EQ(string("::"), reader_.getNamespace());
+
+    // ... and that another $NAMESPACE is rejected
+    processLineException(reader_, "$NAMESPACE ABC", LOG_DUPLICATE_NAMESPACE);
+}
+
+// Check that it can parse a line
+
+TEST_F(MessageReaderTest, ValidMessageAddDefault) {
+
+    // Add a couple of valid messages
+    reader_.processLine("% GLOBAL1\t\tthis is message global one\n");
+    reader_.processLine("%GLOBAL2 this is message global two");
+
+    // ... and check them
+    EXPECT_EQ(string("this is message global one"),
+        dictionary_->getText("GLOBAL1"));
+    EXPECT_EQ(string("this is message global two"),
+        dictionary_->getText("GLOBAL2"));
+    EXPECT_EQ(2, dictionary_->size());
+
+    // ... and ensure no messages were not added
+    vector<string> not_added = reader_.getNotAdded();
+    EXPECT_EQ(0, not_added.size());
+}
+
+TEST_F(MessageReaderTest, ValidMessageAdd) {
+
+    // Add a couple of valid messages
+    reader_.processLine("%GLOBAL1\t\tthis is message global one\n",
+        MessageReader::ADD);
+    reader_.processLine("% GLOBAL2 this is message global two",
+        MessageReader::ADD);
+
+    // ... and check them
+    EXPECT_EQ(string("this is message global one"),
+        dictionary_->getText("GLOBAL1"));
+    EXPECT_EQ(string("this is message global two"),
+        dictionary_->getText("GLOBAL2"));
+    EXPECT_EQ(2, dictionary_->size());
+
+    // ... and ensure no messages were not added
+    vector<string> not_added = reader_.getNotAdded();
+    EXPECT_EQ(0, not_added.size());
+}
+
+TEST_F(MessageReaderTest, ValidMessageReplace) {
+
+    dictionary_->add("GLOBAL1", "original global1 message");
+    dictionary_->add("GLOBAL2", "original global2 message");
+
+    // Replace a couple of valid messages
+    reader_.processLine("% GLOBAL1\t\tthis is message global one\n",
+        MessageReader::REPLACE);
+    reader_.processLine("% GLOBAL2 this is message global two",
+        MessageReader::REPLACE);
+
+    // ... and check them
+    EXPECT_EQ(string("this is message global one"),
+        dictionary_->getText("GLOBAL1"));
+    EXPECT_EQ(string("this is message global two"),
+        dictionary_->getText("GLOBAL2"));
+    EXPECT_EQ(2, dictionary_->size());
+
+    // ... and ensure no messages were not added
+    vector<string> not_added = reader_.getNotAdded();
+    EXPECT_EQ(0, not_added.size());
+}
+
+// Do checks on overflows, although this essentially duplicates the checks
+// in MessageDictionary.
+
+TEST_F(MessageReaderTest, Overflows) {
+
+    // Add a couple of valid messages
+    reader_.processLine("% GLOBAL1\t\tthis is message global one\n");
+    reader_.processLine("% GLOBAL2 this is message global two");
+
+    // Add a duplicate in ADD mode.
+    reader_.processLine("% GLOBAL1\t\tthis is a replacement for global one");
+
+    // Replace a non-existent one in REPLACE mode
+    reader_.processLine("% LOCAL\t\tthis is a new message",
+        MessageReader::REPLACE);
+
+    // Check what is in the dictionary.
+    EXPECT_EQ(string("this is message global one"),
+        dictionary_->getText("GLOBAL1"));
+    EXPECT_EQ(string("this is message global two"),
+        dictionary_->getText("GLOBAL2"));
+    EXPECT_EQ(2, dictionary_->size());
+
+    // ... and ensure no overflows
+    vector<string> not_added = reader_.getNotAdded();
+    ASSERT_EQ(2, not_added.size());
+
+    sort(not_added.begin(), not_added.end());
+    EXPECT_EQ(string("GLOBAL1"), not_added[0]);
+    EXPECT_EQ(string("LOCAL"), not_added[1]);
+}
diff --git a/src/lib/log/tests/output_option_unittest.cc b/src/lib/log/tests/output_option_unittest.cc
new file mode 100644
index 0000000..bf922a9
--- /dev/null
+++ b/src/lib/log/tests/output_option_unittest.cc
@@ -0,0 +1,60 @@
+// 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 <string>
+
+#include <gtest/gtest.h>
+
+#include <log/output_option.h>
+
+using namespace isc::log;
+using namespace std;
+
+// As OutputOption is a struct, the only meaningful test is to check that it
+// initializes correctly.
+
+TEST(OutputOptionTest, Initialization) {
+    OutputOption option;
+
+    EXPECT_EQ(OutputOption::DEST_CONSOLE, option.destination);
+    EXPECT_EQ(OutputOption::STR_STDERR, option.stream);
+    EXPECT_TRUE(option.flush);
+    EXPECT_EQ(string("LOCAL0"), option.facility);
+    EXPECT_EQ(string(""), option.filename);
+    EXPECT_EQ(0, option.maxsize);
+    EXPECT_EQ(0, option.maxver);
+}
+
+TEST(OutputOption, getDestination) {
+    EXPECT_EQ(OutputOption::DEST_CONSOLE, getDestination("console"));
+    EXPECT_EQ(OutputOption::DEST_CONSOLE, getDestination("CONSOLE"));
+    EXPECT_EQ(OutputOption::DEST_CONSOLE, getDestination("CoNSoLE"));
+    EXPECT_EQ(OutputOption::DEST_FILE, getDestination("file"));
+    EXPECT_EQ(OutputOption::DEST_FILE, getDestination("FILE"));
+    EXPECT_EQ(OutputOption::DEST_FILE, getDestination("fIlE"));
+    EXPECT_EQ(OutputOption::DEST_SYSLOG, getDestination("syslog"));
+    EXPECT_EQ(OutputOption::DEST_SYSLOG, getDestination("SYSLOG"));
+    EXPECT_EQ(OutputOption::DEST_SYSLOG, getDestination("SYSlog"));
+
+    // bad values should default to DEST_CONSOLE
+    EXPECT_EQ(OutputOption::DEST_CONSOLE, getDestination("SOME_BAD_VALUE"));
+}
+
+TEST(OutputOption, getStream) {
+    EXPECT_EQ(OutputOption::STR_STDOUT, getStream("stdout"));
+    EXPECT_EQ(OutputOption::STR_STDOUT, getStream("STDOUT"));
+    EXPECT_EQ(OutputOption::STR_STDOUT, getStream("STdouT"));
+    EXPECT_EQ(OutputOption::STR_STDERR, getStream("stderr"));
+    EXPECT_EQ(OutputOption::STR_STDERR, getStream("STDERR"));
+    EXPECT_EQ(OutputOption::STR_STDERR, getStream("StDeRR"));
+
+    // bad values should default to stdout
+    EXPECT_EQ(OutputOption::STR_STDOUT, getStream("some bad value"));
+    EXPECT_EQ(OutputOption::STR_STDOUT, getStream(""));
+}
+
diff --git a/src/lib/log/tests/run_initializer_unittests.cc b/src/lib/log/tests/run_initializer_unittests.cc
new file mode 100644
index 0000000..7765c14
--- /dev/null
+++ b/src/lib/log/tests/run_initializer_unittests.cc
@@ -0,0 +1,19 @@
+// 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 <stdlib.h>
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+
+#include <log/logger_support.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/lib/log/tests/run_unittests.cc b/src/lib/log/tests/run_unittests.cc
new file mode 100644
index 0000000..2753b0b
--- /dev/null
+++ b/src/lib/log/tests/run_unittests.cc
@@ -0,0 +1,20 @@
+// 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 <stdlib.h>
+#include <gtest/gtest.h>
+#include <util/unittests/run_all.h>
+
+#include <log/logger_support.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+    return (isc::util::unittests::run_all());
+}
diff --git a/src/lib/log/tests/severity_test.sh.in b/src/lib/log/tests/severity_test.sh.in
new file mode 100644
index 0000000..02376f8
--- /dev/null
+++ b/src/lib/log/tests/severity_test.sh.in
@@ -0,0 +1,74 @@
+#!/bin/sh
+
+# Copyright (C) 2011-2020 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/.
+
+# Checks that the logger will limit the output of messages less severe than
+# the severity/debug setting.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Include common test library.
+# shellcheck disable=SC1091
+# SC1091: Not following: ... was not specified as input (see shellcheck -x).
+. "@abs_top_builddir@/src/lib/testutils/dhcp_test_lib.sh"
+
+tempfile="@abs_builddir@/severity_test_tempfile_$$"
+
+test_start 'severity.default-parameters'
+cat > $tempfile << .
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+WARN  [example] LOG_BAD_STREAM bad log console output stream: example
+WARN  [example.alpha] LOG_READ_ERROR error reading from message file a.txt: dummy reason
+INFO  [example.alpha] LOG_INPUT_OPEN_FAIL unable to open message file example.msg for input: dummy reason
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+WARN  [example.beta] LOG_BAD_STREAM bad log console output stream: beta_warn
+INFO  [example.beta] LOG_READ_ERROR error reading from message file beta: info
+.
+./logger_example -c stdout | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+test_start 'severity.filter'
+cat > $tempfile << .
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+.
+./logger_example -c stdout -s error | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+test_start 'severity.debug-level'
+cat > $tempfile << .
+FATAL [example] LOG_WRITE_ERROR error writing to test1: 42
+ERROR [example] LOG_READING_LOCAL_FILE reading local message file dummy/file
+WARN  [example] LOG_BAD_STREAM bad log console output stream: example
+WARN  [example.alpha] LOG_READ_ERROR error reading from message file a.txt: dummy reason
+INFO  [example.alpha] LOG_INPUT_OPEN_FAIL unable to open message file example.msg for input: dummy reason
+DEBUG [example] LOG_READING_LOCAL_FILE reading local message file example/0
+DEBUG [example] LOG_READING_LOCAL_FILE reading local message file example/24
+DEBUG [example] LOG_READING_LOCAL_FILE reading local message file example/25
+FATAL [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta_fatal
+ERROR [example.beta] LOG_BAD_DESTINATION unrecognized log destination: beta_error
+WARN  [example.beta] LOG_BAD_STREAM bad log console output stream: beta_warn
+INFO  [example.beta] LOG_READ_ERROR error reading from message file beta: info
+DEBUG [example.beta] LOG_BAD_SEVERITY unrecognized log severity: beta/25
+.
+./logger_example -c stdout -s debug -d 25 | \
+    sed -e 's/\[\([a-z0-9\.]\{1,\}\)\/\([0-9]\{1,\}\)\.\(0x\)\{0,1\}\([0-9A-Fa-f]\{1,\}\)\]/[\1]/' | \
+    cut -d' ' -f3- | diff $tempfile -
+test_finish $?
+
+# Tidy up
+rm -f $tempfile
diff --git a/src/lib/log/tests/tempdir.h.in b/src/lib/log/tests/tempdir.h.in
new file mode 100644
index 0000000..c805844
--- /dev/null
+++ b/src/lib/log/tests/tempdir.h.in
@@ -0,0 +1,21 @@
+// 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/.
+
+#ifndef TEMPDIR_H
+#define TEMPDIR_H
+
+/// \brief Define temporary directory
+///
+/// Defines the temporary directory in which temporary files used by the
+/// unit tests are created.
+
+#include <string>
+
+namespace {
+std::string TEMP_DIR("@builddir@");
+}
+
+#endif // TEMPDIR_H