13 files changed, 5106 insertions, 0 deletions
diff --git a/src/lib/cc/tests/Makefile.am b/src/lib/cc/tests/Makefile.am
new file mode 100644
index 0000000..38f6e7a
--- /dev/null
+++ b/src/lib/cc/tests/Makefile.am
@@ -0,0 +1,40 @@
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diff --git a/src/lib/cc/tests/Makefile.in b/src/lib/cc/tests/Makefile.in
new file mode 100644
index 0000000..5fb8c66
--- /dev/null
+++ b/src/lib/cc/tests/Makefile.in
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+	      if test "$$xpass" -eq 1; then passes=pass; else passes=passes; fi; \
+	      banner="$$failed of $$all $$tests did not behave as expected ($$xpass unexpected $$passes)"; \
+	    fi; \
+	  fi; \
+	  dashes="$$banner"; \
+	  skipped=""; \
+	  if test "$$skip" -ne 0; then \
+	    if test "$$skip" -eq 1; then \
+	      skipped="($$skip test was not run)"; \
+	    else \
+	      skipped="($$skip tests were not run)"; \
+	    fi; \
+	    test `echo "$$skipped" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$skipped"; \
+	  fi; \
+	  report=""; \
+	  if test "$$failed" -ne 0 && test -n "$(PACKAGE_BUGREPORT)"; then \
+	    report="Please report to $(PACKAGE_BUGREPORT)"; \
+	    test `echo "$$report" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/run_unittests-command_interpreter_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-data_file_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-element_value_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-json_feed_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-server_tag_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-simple_parser_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-stamped_element_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-stamped_value_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-user_context_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/run_unittests-command_interpreter_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-data_file_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-element_value_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-json_feed_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-server_tag_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-simple_parser_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-stamped_element_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-stamped_value_unittest.Po
+	-rm -f ./$(DEPDIR)/run_unittests-user_context_unittests.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-generic clean-libtool \
+	clean-noinstPROGRAMS cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-libtool \
+	distclean-tags distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/cc/tests/command_interpreter_unittests.cc b/src/lib/cc/tests/command_interpreter_unittests.cc
new file mode 100644
index 0000000..8738b92
--- /dev/null
+++ b/src/lib/cc/tests/command_interpreter_unittests.cc
@@ -0,0 +1,249 @@
+// Copyright (C) 2009-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <cc/command_interpreter.h>
+#include <config/tests/data_def_unittests_config.h>
+#include <log/logger_name.h>
+
+#include <boost/scoped_ptr.hpp>
+
+#include <fstream>
+
+using namespace isc::data;
+using namespace isc::config;
+using namespace std;
+
+namespace {
+
+
+/// @brief Convenience method for creating elements from JSON string
+///
+/// @param str string to be converted
+/// @return Element structure
+ElementPtr
+el(const std::string& str) {
+    return (Element::fromJSON(str));
+}
+
+// This test verifies that that createAnswer method is able to generate
+// various answers.
+TEST(CommandInterpreterTest, createAnswer) {
+    ConstElementPtr answer;
+
+    // By default the answer is a successful one.
+    answer = createAnswer();
+    EXPECT_EQ("{ \"result\": 0 }", answer->str());
+
+    // Let's check if we can generate an error.
+    answer = createAnswer(CONTROL_RESULT_ERROR, "error");
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"error\" }", answer->str());
+
+    // This is expected to throw. When status code is non-zero (indicating error),
+    // textual explanation is mandatory.
+    EXPECT_THROW(createAnswer(CONTROL_RESULT_ERROR, ElementPtr()), CtrlChannelError);
+    EXPECT_THROW(createAnswer(CONTROL_RESULT_ERROR, Element::create(1)), CtrlChannelError);
+
+    // Let's check if answer can be generate with some data in it.
+    ConstElementPtr arg = el("[ \"just\", \"some\", \"data\" ]");
+    answer = createAnswer(CONTROL_RESULT_SUCCESS, arg);
+    EXPECT_EQ("{ \"arguments\": [ \"just\", \"some\", \"data\" ], \"result\": 0 }",
+              answer->str());
+}
+
+// This test checks whether parseAnswer is able to handle good and malformed
+// answers.
+TEST(CommandInterpreterTest, parseAnswer) {
+    ConstElementPtr answer;
+    ConstElementPtr arg;
+    int rcode;
+
+    EXPECT_THROW(parseAnswer(rcode, ElementPtr()), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("1")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("[]")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("{  }")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("{ \"something\": 1 }")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("{ \"result\": [ 0 ] }")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("{ \"result\": [ 1 ] }")), CtrlChannelError);
+    EXPECT_THROW(parseAnswer(rcode, el("{ \"result\": [ 1, 1 ] }")), CtrlChannelError);
+
+    answer = el("{ \"result\": 0 }");
+    arg = parseAnswer(rcode, answer);
+    EXPECT_EQ(0, rcode);
+    EXPECT_TRUE(isNull(arg));
+
+    answer = el("{ \"result\": 3, \"text\": \"error\", \"arguments\": [ \"some\", \"data\" ] }");
+    arg = parseAnswer(rcode, answer);
+    ASSERT_TRUE(arg);
+    EXPECT_EQ(3, rcode);
+    EXPECT_EQ("[ \"some\", \"data\" ]", arg->str());
+}
+
+// Checks if parseAnswerText can return the text
+TEST(CommandInterpreterTest, parseAnswerText) {
+    ConstElementPtr answer;
+    ConstElementPtr arg;
+    int rcode;
+
+    answer = el("{ \"result\": 5, \"text\": \"error\", \"arguments\": [ \"some\", \"data\" ] }");
+    arg = parseAnswerText(rcode, answer);
+    ASSERT_TRUE(arg);
+    EXPECT_EQ(5, rcode);
+    EXPECT_EQ("error", arg->stringValue());
+}
+
+// This checks whether we can convert an answer to easily printable form.
+TEST(CommandInterpreterTest, answerToText) {
+    ConstElementPtr answer;
+
+    // Doing jolly good here.
+    answer = el("{ \"result\": 0 }");
+    EXPECT_EQ("success(0)", answerToText(answer));
+
+    // Sometimes things don't go according to plan.
+    answer = el("{ \"result\": 1, \"text\": \"ho lee fuk sum ting wong\" }");
+    EXPECT_EQ("failure(1), text=ho lee fuk sum ting wong", answerToText(answer));
+}
+
+// This test checks whether createCommand function is able to create commands
+// with and without parameters.
+TEST(CommandInterpreterTest, createCommand) {
+    ConstElementPtr command;
+    ConstElementPtr arg;
+    string service;
+
+    command = createCommand("my_command");
+    ASSERT_EQ("{ \"command\": \"my_command\" }", command->str());
+
+    arg = el("1");
+    command = createCommand("my_command", arg);
+    ASSERT_EQ("{ \"arguments\": 1, \"command\": \"my_command\" }",
+              command->str());
+
+    arg = el("[ \"a\", \"b\" ]");
+    command = createCommand("my_cmd", arg);
+    ASSERT_EQ("{ \"arguments\": [ \"a\", \"b\" ], \"command\": \"my_cmd\" }",
+              command->str());
+
+    arg = el("{ \"a\": \"map\" }");
+    command = createCommand("foo", arg);
+    ASSERT_EQ("{ \"arguments\": { \"a\": \"map\" }, \"command\": \"foo\" }",
+              command->str());
+
+    command = createCommand("my_command", "my_service");
+    ASSERT_EQ("{ \"command\": \"my_command\", "
+              "\"service\": [ \"my_service\" ] }",
+              command->str());
+
+    arg = el("1");
+    command = createCommand("my_command", arg, "my_service");
+    ASSERT_EQ("{ \"arguments\": 1, \"command\": \"my_command\", "
+              "\"service\": [ \"my_service\" ] }",
+              command->str());
+
+    arg = el("[ \"a\", \"b\" ]");
+    command = createCommand("my_cmd", arg, "my_server");
+    ASSERT_EQ("{ \"arguments\": [ \"a\", \"b\" ], "
+              "\"command\": \"my_cmd\", "
+              "\"service\": [ \"my_server\" ] }",
+              command->str());
+
+    arg = el("{ \"a\": \"map\" }");
+    command = createCommand("foo", arg, "bar");
+    ASSERT_EQ("{ \"arguments\": { \"a\": \"map\" }, "
+              "\"command\": \"foo\", "
+              "\"service\": [ \"bar\" ] }",
+              command->str());
+}
+
+// This test checks whether parseCommand function is able to parse various valid
+// and malformed commands.
+TEST(CommandInterpreterTest, parseCommand) {
+    ConstElementPtr arg;
+    std::string cmd;
+
+    // should throw
+    EXPECT_THROW(parseCommand(arg, ElementPtr()), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("1")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{  }")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{ \"not a command\": 1 }")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{ \"command\": 1 }")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{ \"command\": [] }")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{ \"command\": [ 1 ] }")), CtrlChannelError);
+    EXPECT_THROW(parseCommand(arg, el("{ \"command\": \"my_command\", "
+                                      "\"unknown\": \"xyz\" }")), CtrlChannelError);
+
+    cmd = parseCommand(arg, el("{ \"command\": \"my_command\" }"));
+    EXPECT_EQ("my_command", cmd);
+    EXPECT_FALSE(arg);
+
+    // Include "service" to verify that it is not rejected.
+    cmd = parseCommand(arg, el("{ \"command\": \"my_command\", \"arguments\": 1, "
+                               "  \"service\": [ \"dhcp4\" ] }"));
+    ASSERT_TRUE(arg);
+    EXPECT_EQ("my_command", cmd);
+    EXPECT_EQ("1", arg->str());
+
+    parseCommand(arg, el("{ \"command\": \"my_command\", \"arguments\": "
+                         "[ \"some\", \"argument\", \"list\" ] }"));
+    EXPECT_EQ("my_command", cmd);
+    ASSERT_TRUE(arg);
+    EXPECT_EQ("[ \"some\", \"argument\", \"list\" ]", arg->str());
+
+}
+
+// This test checks whether parseCommandWithArgs function is able to parse
+// various valid and malformed commands.
+TEST(CommandInterpreterTest, parseCommandWithArgs) {
+    ConstElementPtr arg;
+    std::string cmd;
+
+    // Arguments are required.
+    EXPECT_THROW(parseCommandWithArgs(arg, el("{ \"command\": \"my_command\" }")),
+                 CtrlChannelError);
+
+    // Arguments must be a map.
+    EXPECT_THROW(parseCommandWithArgs(arg, el("{ \"command\": \"my_command\", "
+                                              "\"arguments\": [ 1, 2, 3 ] }")),
+                 CtrlChannelError);
+
+    // Arguments must not be empty.
+    EXPECT_THROW(parseCommandWithArgs(arg, el("{ \"command\": \"my_command\", "
+                                              "\"arguments\": { } }")),
+                 CtrlChannelError);
+
+    // Command with unsupported parameter is rejected.
+    EXPECT_THROW(parseCommandWithArgs(arg, el("{ \"command\": \"my_command\", "
+                                              "  \"arguments\": { \"arg1\": \"value1\" }, "
+                                              "  \"unsupported\": 1 }")),
+                 CtrlChannelError);
+
+
+    // Specifying arguments in non empty map should be successful.
+    EXPECT_NO_THROW(
+        cmd = parseCommandWithArgs(arg, el("{ \"command\": \"my_command\", "
+                                           "  \"arguments\": { \"arg1\": \"value1\" } }"))
+    );
+    ASSERT_TRUE(arg);
+    ASSERT_EQ(Element::map, arg->getType());
+    auto arg1 = arg->get("arg1");
+    ASSERT_TRUE(arg1);
+    ASSERT_EQ(Element::string, arg1->getType());
+    EXPECT_EQ("value1", arg1->stringValue());
+    EXPECT_EQ("my_command", cmd);
+
+    // The "service" parameter should be allowed.
+    EXPECT_NO_THROW(parseCommandWithArgs(arg, el("{ \"command\": \"my_command\", "
+                                                 "  \"service\": [ \"dhcp4\" ], "
+                                                 "  \"arguments\": { \"arg1\": \"value1\" } }"))
+    );
+
+}
+
+}
diff --git a/src/lib/cc/tests/data_file_unittests.cc b/src/lib/cc/tests/data_file_unittests.cc
new file mode 100644
index 0000000..a7f1b8d
--- /dev/null
+++ b/src/lib/cc/tests/data_file_unittests.cc
@@ -0,0 +1,98 @@
+// Copyright (C) 2014-2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <exceptions/exceptions.h>
+#include <gtest/gtest.h>
+#include <cc/data.h>
+#include <fstream>
+
+using namespace isc;
+using namespace isc::data;
+
+namespace {
+
+/// @brief Test class for testing Daemon class
+class DataFileTest : public ::testing::Test {
+public:
+
+    /// @brief writes specified text to a file
+    ///
+    /// That is an auxiliary function used in fileRead() tests.
+    ///
+    /// @param content text to be written to disk
+    void writeFile(const std::string& content) {
+        // Write sample content to disk
+        static_cast<void>(remove(TEMP_FILE));
+        std::ofstream write_me(TEMP_FILE);
+        EXPECT_TRUE(write_me.is_open());
+        write_me << content;
+        write_me.close();
+    }
+
+    /// destructor
+    ~DataFileTest() {
+        static_cast<void>(remove(TEMP_FILE));
+    }
+
+    /// Name of the temporary file
+    static const char* TEMP_FILE;
+};
+
+/// Temporary file name used in some tests
+const char* DataFileTest::TEMP_FILE="temp-file.json";
+
+// Test checks whether a text file can be read from disk.
+TEST_F(DataFileTest, readFileMultiline) {
+
+    const char* no_endline = "{ \"abc\": 123 }";
+    const char* with_endline = "{\n \"abc\":\n 123\n }\n";
+
+    // That's what we expect
+    ElementPtr exp = Element::fromJSON(no_endline);
+
+    // Write sample content to disk
+    writeFile(no_endline);
+
+    // Check that the read content is correct
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE)));
+
+    // Write sample content to disk
+    writeFile(with_endline);
+
+    // Check that the read content is correct
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE)));
+}
+
+// Test checks whether comments in file are ignored as expected.
+TEST_F(DataFileTest, readFileComments) {
+    const char* commented_content = "# This is a comment\n"
+        "{ \"abc\":\n"
+        "# a comment comment\n"
+        "1 }\n";
+
+    // That's what we expect
+    ElementPtr exp = Element::fromJSON("{ \"abc\": 1 }");
+
+    // Write sample content to disk
+    writeFile(commented_content);
+
+    // Check that the read will fail (without comment elimination)
+    EXPECT_THROW(Element::fromJSONFile(TEMP_FILE), JSONError);
+
+    // Check that the read content is correct (with comment elimination)
+    EXPECT_NO_THROW(Element::fromJSONFile(TEMP_FILE, true));
+    EXPECT_TRUE(exp->equals(*Element::fromJSONFile(TEMP_FILE, true)));
+}
+
+// This test checks that missing file will generate an exception.
+TEST_F(DataFileTest, readFileError) {
+
+    // Check that the read content is correct
+    EXPECT_THROW(Element::fromJSONFile("no-such-file.txt"), isc::InvalidOperation);
+}
+
+};
diff --git a/src/lib/cc/tests/data_unittests.cc b/src/lib/cc/tests/data_unittests.cc
new file mode 100644
index 0000000..ed23c45
--- /dev/null
+++ b/src/lib/cc/tests/data_unittests.cc
@@ -0,0 +1,2232 @@
+// Copyright (C) 2009-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+#include <boost/foreach.hpp>
+#include <boost/pointer_cast.hpp>
+#include <boost/assign/std/vector.hpp>
+#include <climits>
+
+#include <cc/data.h>
+#include <util/unittests/check_valgrind.h>
+
+using namespace isc::data;
+
+#include <sstream>
+#include <iostream>
+using std::oct;
+#include <iomanip>
+using std::setfill;
+using std::setw;
+using std::string;
+
+namespace {
+
+TEST(Position, str) {
+    Element::Position position("kea.conf", 30, 20);
+    EXPECT_EQ("kea.conf:30:20", position.str());
+
+    Element::Position position2("another.conf", 123, 24);
+    EXPECT_EQ("another.conf:123:24", position2.str());
+}
+
+TEST(Element, type) {
+    // this tests checks whether the getType() function returns the
+    // correct type
+    IntElement int_el = IntElement(1);
+    EXPECT_EQ(int_el.getType(), Element::integer);
+    DoubleElement double_el = DoubleElement(1.0);
+    EXPECT_EQ(double_el.getType(), Element::real);
+    BoolElement bool_el = BoolElement(true);
+    EXPECT_EQ(bool_el.getType(), Element::boolean);
+    StringElement str_el = StringElement("foo");
+    EXPECT_EQ(str_el.getType(), Element::string);
+    ListElement list_el = ListElement();
+    EXPECT_EQ(list_el.getType(), Element::list);
+    MapElement map_el = MapElement();
+    EXPECT_EQ(map_el.getType(), Element::map);
+
+}
+
+TEST(Element, TypeNameConversion) {
+    EXPECT_EQ(Element::integer, Element::nameToType("integer"));
+    EXPECT_EQ(Element::bigint, Element::nameToType("bigint"));
+    EXPECT_EQ(Element::real, Element::nameToType("real"));
+    EXPECT_EQ(Element::boolean, Element::nameToType("boolean"));
+    EXPECT_EQ(Element::string, Element::nameToType("string"));
+    EXPECT_EQ(Element::list, Element::nameToType("list"));
+    EXPECT_EQ(Element::map, Element::nameToType("map"));
+    EXPECT_EQ(Element::null, Element::nameToType("null"));
+    EXPECT_EQ(Element::any, Element::nameToType("any"));
+    EXPECT_THROW(Element::nameToType("somethingunknown"), TypeError);
+
+    EXPECT_EQ("integer", Element::typeToName(Element::integer));
+    EXPECT_EQ("bigint", Element::typeToName(Element::bigint));
+    EXPECT_EQ("real", Element::typeToName(Element::real));
+    EXPECT_EQ("boolean", Element::typeToName(Element::boolean));
+    EXPECT_EQ("string", Element::typeToName(Element::string));
+    EXPECT_EQ("list", Element::typeToName(Element::list));
+    EXPECT_EQ("map", Element::typeToName(Element::map));
+    EXPECT_EQ("null", Element::typeToName(Element::null));
+    EXPECT_EQ("any", Element::typeToName(Element::any));
+    EXPECT_EQ("unknown", Element::typeToName(static_cast<Element::types>(123)));
+}
+
+TEST(Element, from_and_to_json) {
+    // a set of inputs that are the same when converted to json and
+    // back to a string (tests for inputs that have equivalent, but
+    // different string representations when converted back are below)
+    ConstElementPtr el;
+    std::vector<std::string> sv;
+
+    sv.push_back("12");
+    sv.push_back("1.1");
+    sv.push_back("true");
+    sv.push_back("false");
+    sv.push_back("\"asdf\"");
+    sv.push_back("null");
+    sv.push_back("[ 1, 2, 3, 4 ]");
+    sv.push_back("{ \"name\": \"foo\", \"value\": 56176 }");
+    sv.push_back("[ { \"a\": 1, \"b\": \"c\" }, { \"a\": 2, \"b\": \"d\" } ]");
+    sv.push_back("8.23");
+    sv.push_back("123.456");
+    sv.push_back("null");
+    sv.push_back("-1");
+    sv.push_back("-1.234");
+    sv.push_back("-123.456");
+    // We should confirm that our string handling is 8-bit clean.
+    // At one point we were using char-length data and comparing to EOF,
+    // which means that character '\xFF' would not parse properly.
+    sv.push_back("\"\\u00ff\"");
+
+    BOOST_FOREACH(const std::string& s, sv) {
+        // Test two types of fromJSON(): with string and istream.
+        for (unsigned i = 0; i < 2; ++i) {
+            // test << operator, which uses Element::str()
+            if (i == 0) {
+                el = Element::fromJSON(s);
+            } else {
+                std::istringstream iss(s);
+                el = Element::fromJSON(iss);
+            }
+            std::ostringstream stream;
+            stream << *el;
+            EXPECT_EQ(s, stream.str());
+
+            // test toWire(ostream), which should also be the same now
+            std::ostringstream wire_stream;
+            el->toWire(wire_stream);
+            EXPECT_EQ(s, wire_stream.str());
+        }
+    }
+
+    // some parse errors
+    try {
+        Element::fromJSON("{1}");
+    } catch (const isc::data::JSONError& pe) {
+        std::string s = std::string(pe.what());
+        EXPECT_EQ("String expected in <string>:1:3", s);
+    }
+
+    sv.clear();
+    sv.push_back("{1}");
+    //ElementPtr ep = Element::fromJSON("\"aaa\nbbb\"err");
+    //std::cout << ep << std::endl;
+    sv.push_back("\n\nTrue");
+    sv.push_back("\n\ntru");
+    sv.push_back("{ \n \"aaa\nbbb\"err:");
+    sv.push_back("{ \t\n \"aaa\nbbb\"\t\n\n:\n true, \"\\\"");
+    sv.push_back("{ \"a\": None}");
+    sv.push_back("");
+    sv.push_back("NULL");
+    sv.push_back("nul");
+    sv.push_back("hello\"foobar\"");
+    sv.push_back("\"foobar\"hello");
+    sv.push_back("[]hello");
+    sv.push_back("{}hello");
+    // String not delimited correctly
+    sv.push_back("\"hello");
+    sv.push_back("hello\"");
+    // Bad unicode
+    sv.push_back("\"\\u123\"");
+    sv.push_back("\"\\u1234\"");
+    sv.push_back("\"\\u0123\"");
+    sv.push_back("\"\\u00ag\"");
+    sv.push_back("\"\\u00BH\"");
+
+    BOOST_FOREACH(std::string s, sv) {
+        EXPECT_THROW(el = Element::fromJSON(s), isc::data::JSONError);
+    }
+
+    // some json specific format tests, here the str() output is
+    // different from the string input
+    // +100 is incorrect according to the ECMA 404 JSON standard.
+    // Keeping it as it will be reversed.
+    // EXPECT_EQ("100", Element::fromJSON("+100")->str());
+    EXPECT_EQ("100.0", Element::fromJSON("1e2")->str());
+    EXPECT_EQ("100.0", Element::fromJSON("+1e2")->str());
+    EXPECT_EQ("-100.0", Element::fromJSON("-1e2")->str());
+
+    EXPECT_NO_THROW({
+       EXPECT_EQ("9223372036854775807", Element::fromJSON("9223372036854775807")->str());
+    });
+    EXPECT_NO_THROW({
+       EXPECT_EQ("-9223372036854775808", Element::fromJSON("-9223372036854775808")->str());
+    });
+    EXPECT_THROW({
+       EXPECT_NE("9223372036854775808", Element::fromJSON("9223372036854775808")->str());
+    }, JSONError);
+
+    EXPECT_EQ("0.01", Element::fromJSON("1e-2")->str());
+    EXPECT_EQ("0.01", Element::fromJSON(".01")->str());
+    EXPECT_EQ("-0.01", Element::fromJSON("-1e-2")->str());
+    EXPECT_EQ("1.2", Element::fromJSON("1.2")->str());
+    EXPECT_EQ("1.0", Element::fromJSON("1.0")->str());
+    EXPECT_EQ("120.0", Element::fromJSON("1.2e2")->str());
+    EXPECT_EQ("100.0", Element::fromJSON("1.0e2")->str());
+    EXPECT_EQ("100.0", Element::fromJSON("1.0E2")->str());
+    EXPECT_EQ("0.01", Element::fromJSON("1.0e-2")->str());
+    EXPECT_EQ("0.012", Element::fromJSON("1.2e-2")->str());
+    EXPECT_EQ("0.012", Element::fromJSON("1.2E-2")->str());
+    EXPECT_EQ("\"\"", Element::fromJSON("  \n \t \r \f \b \"\" \n \f \t \r \b")->str());
+    EXPECT_EQ("{  }", Element::fromJSON("{  \n  \r \t  \b \f }")->str());
+    EXPECT_EQ("[  ]", Element::fromJSON("[  \n  \r \f \t  \b  ]")->str());
+
+    // number overflows
+    EXPECT_THROW(Element::fromJSON("12345678901234567890")->str(), JSONError);
+    EXPECT_THROW(Element::fromJSON("1.1e12345678901234567890")->str(), JSONError);
+    EXPECT_THROW(Element::fromJSON("-1.1e12345678901234567890")->str(), JSONError);
+    EXPECT_THROW(Element::fromJSON("1e12345678901234567890")->str(), JSONError);
+    EXPECT_THROW(Element::fromJSON("1e50000")->str(), JSONError);
+    // number underflow
+    // EXPECT_THROW(Element::fromJSON("1.1e-12345678901234567890")->str(), JSONError);
+
+}
+
+template <typename T>
+void
+testGetValueInt() {
+    T el;
+    int64_t i;
+    int32_t i32;
+    uint32_t ui32;
+    long l;
+    long long ll;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::create(1);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(1, el->intValue());
+    });
+    EXPECT_THROW(el->doubleValue(), TypeError);
+    EXPECT_THROW(el->boolValue(), TypeError);
+    EXPECT_THROW(el->stringValue(), TypeError);
+    EXPECT_THROW(el->listValue(), TypeError);
+    EXPECT_THROW(el->mapValue(), TypeError);
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_FALSE(el->getValue(d));
+    EXPECT_FALSE(el->getValue(b));
+    EXPECT_FALSE(el->getValue(s));
+    EXPECT_FALSE(el->getValue(v));
+    EXPECT_FALSE(el->getValue(m));
+    EXPECT_EQ(1, i);
+
+    el = Element::create(9223372036854775807LL);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(9223372036854775807LL, el->intValue());
+    });
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_EQ(9223372036854775807LL, i);
+
+    ll = 9223372036854775807LL;
+    el = Element::create(ll);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(ll, el->intValue());
+    });
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_EQ(ll, i);
+
+    i32 = 2147483647L;
+    el = Element::create(i32);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(i32, el->intValue());
+    });
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_EQ(i32, i);
+
+    ui32 = 4294967295L;
+    el = Element::create(ui32);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(ui32, el->intValue());
+    });
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_EQ(ui32, i);
+
+    l = 2147483647L;
+    el = Element::create(l);
+    EXPECT_NO_THROW({
+       EXPECT_EQ(l, el->intValue());
+    });
+    EXPECT_TRUE(el->getValue(i));
+    EXPECT_EQ(l, i);
+}
+
+template <typename T>
+void
+testGetValueDouble() {
+    T el;
+    int64_t i;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::create(1.1);
+    EXPECT_THROW(el->intValue(), TypeError);
+    EXPECT_NO_THROW(el->doubleValue());
+    EXPECT_THROW(el->boolValue(), TypeError);
+    EXPECT_THROW(el->stringValue(), TypeError);
+    EXPECT_THROW(el->listValue(), TypeError);
+    EXPECT_THROW(el->mapValue(), TypeError);
+    EXPECT_FALSE(el->getValue(i));
+    EXPECT_TRUE(el->getValue(d));
+    EXPECT_FALSE(el->getValue(b));
+    EXPECT_FALSE(el->getValue(s));
+    EXPECT_FALSE(el->getValue(v));
+    EXPECT_FALSE(el->getValue(m));
+    EXPECT_EQ(1.1, d);
+}
+
+template <typename T>
+void
+testGetValueBool() {
+    T el;
+    int64_t i;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::create(true);
+    EXPECT_THROW(el->intValue(), TypeError);
+    EXPECT_THROW(el->doubleValue(), TypeError);
+    EXPECT_NO_THROW(el->boolValue());
+    EXPECT_THROW(el->stringValue(), TypeError);
+    EXPECT_THROW(el->listValue(), TypeError);
+    EXPECT_THROW(el->mapValue(), TypeError);
+    EXPECT_FALSE(el->getValue(i));
+    EXPECT_FALSE(el->getValue(d));
+    EXPECT_TRUE(el->getValue(b));
+    EXPECT_FALSE(el->getValue(s));
+    EXPECT_FALSE(el->getValue(v));
+    EXPECT_FALSE(el->getValue(m));
+    EXPECT_EQ(true, b);
+}
+
+template <typename T>
+void
+testGetValueString() {
+    T el;
+    int64_t i;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::create("foo");
+    EXPECT_THROW(el->intValue(), TypeError);
+    EXPECT_THROW(el->doubleValue(), TypeError);
+    EXPECT_THROW(el->boolValue(), TypeError);
+    EXPECT_NO_THROW(el->stringValue());
+    EXPECT_THROW(el->listValue(), TypeError);
+    EXPECT_THROW(el->mapValue(), TypeError);
+    EXPECT_FALSE(el->getValue(i));
+    EXPECT_FALSE(el->getValue(d));
+    EXPECT_FALSE(el->getValue(b));
+    EXPECT_TRUE(el->getValue(s));
+    EXPECT_FALSE(el->getValue(v));
+    EXPECT_FALSE(el->getValue(m));
+    EXPECT_EQ("foo", s);
+}
+
+template <typename T>
+void
+testGetValueList() {
+    T el;
+    int64_t i;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::createList();
+    EXPECT_THROW(el->intValue(), TypeError);
+    EXPECT_THROW(el->doubleValue(), TypeError);
+    EXPECT_THROW(el->boolValue(), TypeError);
+    EXPECT_THROW(el->stringValue(), TypeError);
+    EXPECT_NO_THROW(el->listValue());
+    EXPECT_THROW(el->mapValue(), TypeError);
+    EXPECT_FALSE(el->getValue(i));
+    EXPECT_FALSE(el->getValue(d));
+    EXPECT_FALSE(el->getValue(b));
+    EXPECT_FALSE(el->getValue(s));
+    EXPECT_TRUE(el->getValue(v));
+    EXPECT_FALSE(el->getValue(m));
+    EXPECT_EQ("[  ]", el->str());
+}
+
+template <typename T>
+void
+testGetValueMap() {
+    T el;
+    int64_t i;
+    double d;
+    bool b;
+    std::string s;
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+
+    el = Element::createMap();
+    EXPECT_THROW(el->intValue(), TypeError);
+    EXPECT_THROW(el->doubleValue(), TypeError);
+    EXPECT_THROW(el->boolValue(), TypeError);
+    EXPECT_THROW(el->stringValue(), TypeError);
+    EXPECT_THROW(el->listValue(), TypeError);
+    EXPECT_NO_THROW(el->mapValue());
+    EXPECT_FALSE(el->getValue(i));
+    EXPECT_FALSE(el->getValue(d));
+    EXPECT_FALSE(el->getValue(b));
+    EXPECT_FALSE(el->getValue(s));
+    EXPECT_FALSE(el->getValue(v));
+    EXPECT_TRUE(el->getValue(m));
+    EXPECT_EQ("{  }", el->str());
+}
+
+TEST(Element, create_and_value_throws) {
+    // this test checks whether elements throw exceptions if the
+    // incorrect type is requested
+    ElementPtr el;
+    ConstElementPtr cel;
+    int64_t i = 0;
+    double d = 0.0;
+    bool b = false;
+    std::string s("asdf");
+    std::vector<ElementPtr> v;
+    std::map<std::string, ConstElementPtr> m;
+    ConstElementPtr tmp;
+
+    testGetValueInt<ElementPtr>();
+    testGetValueInt<ConstElementPtr>();
+
+    el = Element::create(1);
+    i = 2;
+    EXPECT_TRUE(el->setValue(i));
+    EXPECT_EQ(2, el->intValue());
+    EXPECT_FALSE(el->setValue(d));
+    EXPECT_FALSE(el->setValue(b));
+    EXPECT_FALSE(el->setValue(s));
+    EXPECT_FALSE(el->setValue(v));
+    EXPECT_FALSE(el->setValue(m));
+    EXPECT_THROW(el->get(1), TypeError);
+    EXPECT_THROW(el->set(1, el), TypeError);
+    EXPECT_THROW(el->add(el), TypeError);
+    EXPECT_THROW(el->remove(1), TypeError);
+    EXPECT_THROW(el->size(), TypeError);
+    EXPECT_THROW(el->empty(), TypeError);
+    EXPECT_THROW(el->get("foo"), TypeError);
+    EXPECT_THROW(el->set("foo", el), TypeError);
+    EXPECT_THROW(el->remove("foo"), TypeError);
+    EXPECT_THROW(el->contains("foo"), TypeError);
+    EXPECT_FALSE(el->find("foo", tmp));
+
+    testGetValueDouble<ElementPtr>();
+    testGetValueDouble<ConstElementPtr>();
+
+    el = Element::create(1.1);
+    d = 2.2;
+    EXPECT_TRUE(el->setValue(d));
+    EXPECT_EQ(2.2, el->doubleValue());
+    EXPECT_FALSE(el->setValue(i));
+    EXPECT_FALSE(el->setValue(b));
+    EXPECT_FALSE(el->setValue(s));
+    EXPECT_FALSE(el->setValue(v));
+    EXPECT_FALSE(el->setValue(m));
+    EXPECT_THROW(el->get(1), TypeError);
+    EXPECT_THROW(el->set(1, el), TypeError);
+    EXPECT_THROW(el->add(el), TypeError);
+    EXPECT_THROW(el->remove(1), TypeError);
+    EXPECT_THROW(el->size(), TypeError);
+    EXPECT_THROW(el->empty(), TypeError);
+    EXPECT_THROW(el->get("foo"), TypeError);
+    EXPECT_THROW(el->set("foo", el), TypeError);
+    EXPECT_THROW(el->remove("foo"), TypeError);
+    EXPECT_THROW(el->contains("foo"), TypeError);
+    EXPECT_FALSE(el->find("foo", tmp));
+
+    testGetValueBool<ElementPtr>();
+    testGetValueBool<ConstElementPtr>();
+
+    el = Element::create(true);
+    b = false;
+    EXPECT_TRUE(el->setValue(b));
+    EXPECT_FALSE(el->boolValue());
+    EXPECT_FALSE(el->setValue(i));
+    EXPECT_FALSE(el->setValue(d));
+    EXPECT_FALSE(el->setValue(s));
+    EXPECT_FALSE(el->setValue(v));
+    EXPECT_FALSE(el->setValue(m));
+    EXPECT_THROW(el->get(1), TypeError);
+    EXPECT_THROW(el->set(1, el), TypeError);
+    EXPECT_THROW(el->add(el), TypeError);
+    EXPECT_THROW(el->remove(1), TypeError);
+    EXPECT_THROW(el->size(), TypeError);
+    EXPECT_THROW(el->empty(), TypeError);
+    EXPECT_THROW(el->get("foo"), TypeError);
+    EXPECT_THROW(el->set("foo", el), TypeError);
+    EXPECT_THROW(el->remove("foo"), TypeError);
+    EXPECT_THROW(el->contains("foo"), TypeError);
+    EXPECT_FALSE(el->find("foo", tmp));
+
+    testGetValueString<ElementPtr>();
+    testGetValueString<ConstElementPtr>();
+
+    el = Element::create("foo");
+    s = "bar";
+    EXPECT_TRUE(el->setValue(s));
+    EXPECT_EQ("bar", el->stringValue());
+    EXPECT_FALSE(el->setValue(i));
+    EXPECT_FALSE(el->setValue(b));
+    EXPECT_FALSE(el->setValue(d));
+    EXPECT_FALSE(el->setValue(v));
+    EXPECT_FALSE(el->setValue(m));
+    EXPECT_THROW(el->get(1), TypeError);
+    EXPECT_THROW(el->set(1, el), TypeError);
+    EXPECT_THROW(el->add(el), TypeError);
+    EXPECT_THROW(el->remove(1), TypeError);
+    EXPECT_THROW(el->size(), TypeError);
+    EXPECT_THROW(el->empty(), TypeError);
+    EXPECT_THROW(el->get("foo"), TypeError);
+    EXPECT_THROW(el->set("foo", el), TypeError);
+    EXPECT_THROW(el->remove("foo"), TypeError);
+    EXPECT_THROW(el->contains("foo"), TypeError);
+    EXPECT_FALSE(el->find("foo", tmp));
+
+    testGetValueList<ElementPtr>();
+    testGetValueList<ConstElementPtr>();
+
+    el = Element::createList();
+    EXPECT_TRUE(el->empty());
+    v.push_back(Element::create(1));
+    EXPECT_TRUE(el->setValue(v));
+    EXPECT_FALSE(el->empty());
+    EXPECT_EQ("[ 1 ]", el->str());
+
+    testGetValueMap<ElementPtr>();
+    testGetValueMap<ConstElementPtr>();
+
+    el = Element::createMap();
+    EXPECT_NO_THROW(el->set("foo", Element::create("bar")));
+    EXPECT_EQ("{ \"foo\": \"bar\" }", el->str());
+}
+
+// Helper for escape check; it puts the given string in a StringElement,
+// then checks for the following conditions:
+// stringValue() must be same as input
+// toJSON() output must be escaped
+// fromJSON() on the previous output must result in original input
+void
+escapeHelper(const std::string& input, const std::string& expected) {
+    StringElement str_element = StringElement(input);
+    EXPECT_EQ(input, str_element.stringValue());
+    std::stringstream os;
+    str_element.toJSON(os);
+    EXPECT_EQ(expected, os.str());
+    ElementPtr str_element2 = Element::fromJSON(os.str());
+    EXPECT_EQ(str_element.stringValue(), str_element2->stringValue());
+}
+
+TEST(Element, escape) {
+    // Test whether quotes are escaped correctly when creating direct
+    // String elements.
+    escapeHelper("foo\"bar", "\"foo\\\"bar\"");
+    escapeHelper("foo\\bar", "\"foo\\\\bar\"");
+    escapeHelper("foo\bbar", "\"foo\\bbar\"");
+    escapeHelper("foo\fbar", "\"foo\\fbar\"");
+    escapeHelper("foo\nbar", "\"foo\\nbar\"");
+    escapeHelper("foo\rbar", "\"foo\\rbar\"");
+    escapeHelper("foo\tbar", "\"foo\\tbar\"");
+    escapeHelper("foo\u001fbar", "\"foo\\u001fbar\"");
+    // Bad escapes
+    EXPECT_THROW(Element::fromJSON("\\a"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\"), JSONError);
+    // Can't have escaped quotes outside strings
+    EXPECT_THROW(Element::fromJSON("\\\"\\\""), JSONError);
+    // Unicode use lower u and 4 hexa, only 00 prefix is supported
+    EXPECT_THROW(Element::fromJSON("\\U0020"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u002"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u0123"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u1023"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u00ag"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u00ga"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u00BH"), JSONError);
+    EXPECT_THROW(Element::fromJSON("\\u00HB"), JSONError);
+    // Inside strings is OK
+    EXPECT_NO_THROW(Element::fromJSON("\"\\\"\\\"\""));
+    // A whitespace test
+    EXPECT_NO_THROW(Element::fromJSON("\"  \n  \r \t \f  \n \n    \t\""));
+    // Escape for forward slash is optional
+    ASSERT_NO_THROW(Element::fromJSON("\"foo\\/bar\""));
+    EXPECT_EQ("foo/bar", Element::fromJSON("\"foo\\/bar\"")->stringValue());
+    // Control characters
+    StringElement bell("foo\abar");
+    EXPECT_EQ("\"foo\\u0007bar\"", bell.str());
+    // 8 bit escape
+    StringElement ab("foo\253bar");
+    EXPECT_EQ("\"foo\\u00abbar\"", ab.str());
+    ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00abbar\""));
+    EXPECT_TRUE(ab.equals(*Element::fromJSON("\"foo\\u00abbar\"")));
+    ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00ABbar\""));
+    EXPECT_TRUE(ab.equals(*Element::fromJSON("\"foo\\u00ABbar\"")));
+    StringElement f1("foo\361bar");
+    EXPECT_EQ("\"foo\\u00f1bar\"", f1.str());
+    ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00f1bar\""));
+    EXPECT_TRUE(f1.equals(*Element::fromJSON("\"foo\\u00f1bar\"")));
+    ASSERT_NO_THROW(Element::fromJSON("\"foo\\u00F1bar\""));
+    EXPECT_TRUE(f1.equals(*Element::fromJSON("\"foo\\u00F1bar\"")));
+}
+
+// This test verifies that strings are copied.
+TEST(Element, stringCopy) {
+    // StringElement constructor copies its string argument.
+    std::string foo = "foo";
+    ElementPtr elem = ElementPtr(new StringElement(foo));
+    EXPECT_EQ(foo, elem->stringValue());
+    foo[1] = 'O';
+    EXPECT_EQ("fOo", foo);
+    EXPECT_NE(foo, elem->stringValue());
+
+    // Map keys are copied too.
+    ElementPtr map = ElementPtr(new MapElement());
+    std::string bar = "bar";
+    map->set(bar, ElementPtr(new IntElement(1)));
+    ConstElementPtr item = map->get("bar");
+    ASSERT_TRUE(item);
+    EXPECT_EQ(1, item->intValue());
+    bar[0] = 'B';
+    EXPECT_EQ("Bar", bar);
+    EXPECT_TRUE(map->get("bar"));
+    EXPECT_FALSE(map->get(bar));
+}
+
+// This test verifies that a backslash can be used in element content
+// when the element is created using constructor.
+TEST(Element, backslash1) {
+    string input = "SMSBoot\\x64";// One slash passed to elem constructor...
+    string exp = "SMSBoot\\x64";  // ... should result in one slash in the actual option.
+
+    StringElement elem(input);
+    EXPECT_EQ(exp, elem.stringValue());
+}
+
+// This test verifies that a backslash can be used in element content
+// when the element is created using fromJSON.
+TEST(Element, backslash2) {
+    string input = "\"SMSBoot\\\\x64\""; // Two slashes put in the config file...
+    string exp = "SMSBoot\\x64"; // ... should result in one slash in the actual option.
+
+    ElementPtr elem = Element::fromJSON(input);
+    EXPECT_EQ(exp, elem->stringValue());
+}
+
+TEST(Element, ListElement) {
+    // this function checks the specific functions for ListElements
+    ElementPtr el = Element::fromJSON("[ 1, \"bar\", 3 ]");
+    EXPECT_EQ(el->get(0)->intValue(), 1);
+    EXPECT_EQ(el->get(1)->stringValue(), "bar");
+    EXPECT_EQ(el->get(2)->intValue(), 3);
+
+    el->set(0, Element::fromJSON("\"foo\""));
+    EXPECT_EQ(el->get(0)->stringValue(), "foo");
+
+    el->add(Element::create(56176));
+    EXPECT_EQ(el->get(3)->intValue(), 56176);
+
+    el->remove(1);
+    el->remove(1);
+    EXPECT_EQ(el->str(), "[ \"foo\", 56176 ]");
+
+    // hmm, it errors on EXPECT_THROW(el->get(3), std::out_of_range)
+    EXPECT_ANY_THROW(el->get(3));
+
+    el->add(Element::create(32));
+    EXPECT_EQ(32, el->get(2)->intValue());
+
+    // boundary condition tests for set()
+    el->set(2, Element::create(0)); // update the last entry of the list
+    EXPECT_EQ(0, el->get(2)->intValue());
+    // attempt of set beyond the range of list should trigger an exception.
+    EXPECT_ANY_THROW(el->set(3, Element::create(0)));
+}
+
+TEST(Element, MapElement) {
+    // this function checks the specific functions for ListElements
+    ElementPtr el = Element::fromJSON("{ \"name\": \"foo\", \"value1\": \"bar\", \"value2\": { \"number\": 42 } }");
+    ConstElementPtr el2;
+
+    EXPECT_EQ(el->get("name")->stringValue(), "foo");
+    EXPECT_EQ(el->get("value2")->getType(), Element::map);
+
+    EXPECT_TRUE(isNull(el->get("value3")));
+
+    EXPECT_FALSE(el->empty());
+
+    el->set("value3", Element::create(56176));
+    EXPECT_EQ(el->get("value3")->intValue(), 56176);
+
+    el->remove("value3");
+    EXPECT_TRUE(isNull(el->get("value3")));
+
+    EXPECT_EQ(el->find("value2/number")->intValue(), 42);
+    EXPECT_TRUE(isNull(el->find("value2/nothing/")));
+
+    EXPECT_EQ(el->find("value1")->stringValue(), "bar");
+    EXPECT_EQ(el->find("value1/")->stringValue(), "bar");
+
+    EXPECT_TRUE(el->find("value1", el2));
+    EXPECT_EQ("bar", el2->stringValue());
+    EXPECT_FALSE(el->find("name/error", el2));
+
+    // A map element whose (only) element has the maximum length of tag.
+    string long_maptag("0123456789abcdef1123456789abcdef2123456789abcdef"
+                       "3123456789abcdef4123456789abcdef5123456789abcdef"
+                       "6123456789abcdef7123456789abcdef8123456789abcdef"
+                       "9123456789abcdefa123456789abcdefb123456789abcdef"
+                       "c123456789abcdefd123456789abcdefe123456789abcdef"
+                       "f123456789abcde");
+
+    EXPECT_EQ(255, long_maptag.length()); // check prerequisite
+    el = Element::fromJSON("{ \"" + long_maptag + "\": \"bar\"}");
+    EXPECT_EQ("bar", el->find(long_maptag)->stringValue());
+
+    el = Element::createMap();
+    el->set(long_maptag, Element::create("bar"));
+    EXPECT_EQ("bar", el->find(long_maptag)->stringValue());
+
+    // A one-byte longer tag should still be allowed
+    long_maptag.push_back('f');
+    el = Element::fromJSON("{ \"" + long_maptag + "\": \"bar\"}");
+    el->set(long_maptag, Element::create("bar"));
+    EXPECT_EQ("bar", el->find(long_maptag)->stringValue());
+
+    // Null pointer value
+    el.reset(new MapElement());
+    ConstElementPtr null_ptr;
+    el->set("value", null_ptr);
+    EXPECT_FALSE(el->get("value"));
+    EXPECT_EQ("{ \"value\": None }", el->str());
+}
+
+TEST(Element, to_and_from_wire) {
+    // Wire format is now plain JSON.
+    EXPECT_EQ("1", Element::create(1)->toWire());
+    EXPECT_EQ("1.1", Element::create(1.1)->toWire());
+    EXPECT_EQ("true", Element::create(true)->toWire());
+    EXPECT_EQ("false", Element::create(false)->toWire());
+    EXPECT_EQ("null", Element::create()->toWire());
+    EXPECT_EQ("\"a string\"", Element::create("a string")->toWire());
+    EXPECT_EQ("[ \"a\", \"list\" ]", Element::fromJSON("[ \"a\", \"list\" ]")->toWire());
+    EXPECT_EQ("{ \"a\": \"map\" }", Element::fromJSON("{ \"a\": \"map\" }")->toWire());
+
+    EXPECT_EQ("1", Element::fromWire("1")->str());
+
+    std::stringstream ss;
+    ss << "1";
+    EXPECT_EQ("1", Element::fromWire(ss, 1)->str());
+
+    // Some malformed JSON input
+    EXPECT_THROW(Element::fromJSON("{ "), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\" "), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": "), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": \"b\""), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": {"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": {}"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": []"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\": [ }"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{\":"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("]"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("[ 1, 2, }"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("[ 1, 2, {}"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("[ 1, 2, { ]"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("[ "), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{{}}"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{[]}"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("{ \"a\", \"b\" }"), isc::data::JSONError);
+    EXPECT_THROW(Element::fromJSON("[ \"a\": \"b\" ]"), isc::data::JSONError);
+}
+
+ConstElementPtr
+efs(const std::string& str) {
+    return (Element::fromJSON(str));
+}
+
+TEST(Element, equals) {
+    EXPECT_EQ(*efs("1"), *efs("1"));
+    EXPECT_NE(*efs("1"), *efs("2"));
+    EXPECT_NE(*efs("1"), *efs("\"1\""));
+    EXPECT_NE(*efs("1"), *efs("[]"));
+    EXPECT_NE(*efs("1"), *efs("true"));
+    EXPECT_NE(*efs("1"), *efs("{}"));
+    EXPECT_EQ(*efs("1.1"), *efs("1.1"));
+    EXPECT_NE(*efs("1.0"), *efs("1"));
+    EXPECT_NE(*efs("1.1"), *efs("\"1\""));
+    EXPECT_NE(*efs("1.1"), *efs("[]"));
+    EXPECT_NE(*efs("1.1"), *efs("true"));
+    EXPECT_NE(*efs("1.1"), *efs("{}"));
+
+    EXPECT_EQ(*efs("true"), *efs("true"));
+    EXPECT_NE(*efs("true"), *efs("false"));
+    EXPECT_NE(*efs("true"), *efs("1"));
+    EXPECT_NE(*efs("true"), *efs("\"1\""));
+    EXPECT_NE(*efs("true"), *efs("[]"));
+    EXPECT_NE(*efs("true"), *efs("{}"));
+
+    EXPECT_EQ(*efs("\"foo\""), *efs("\"foo\""));
+    EXPECT_NE(*efs("\"foo\""), *efs("\"bar\""));
+    EXPECT_NE(*efs("\"foo\""), *efs("1"));
+    EXPECT_NE(*efs("\"foo\""), *efs("\"1\""));
+    EXPECT_NE(*efs("\"foo\""), *efs("true"));
+    EXPECT_NE(*efs("\"foo\""), *efs("[]"));
+    EXPECT_NE(*efs("\"foo\""), *efs("{}"));
+
+    EXPECT_EQ(*efs("[]"), *efs("[]"));
+    EXPECT_EQ(*efs("[ 1, 2, 3 ]"), *efs("[ 1, 2, 3 ]"));
+    EXPECT_EQ(*efs("[ \"a\", [ true, 1], 2.2 ]"), *efs("[ \"a\", [ true, 1], 2.2 ]"));
+    EXPECT_NE(*efs("[ \"a\", [ true, 1], 2.2 ]"), *efs("[ \"a\", [ true, 2], 2.2 ]"));
+    EXPECT_NE(*efs("[]"), *efs("[1]"));
+    EXPECT_NE(*efs("[]"), *efs("1"));
+    EXPECT_NE(*efs("[]"), *efs("\"1\""));
+    EXPECT_NE(*efs("[]"), *efs("{}"));
+
+    EXPECT_EQ(*efs("{}"), *efs("{}"));
+    EXPECT_EQ(*efs("{ \"foo\": \"bar\" }"), *efs("{ \"foo\": \"bar\" }"));
+    EXPECT_EQ(*efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\" ], \"item3\": { \"foo\": \"bar\" } }"), *efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\" ], \"item3\": { \"foo\": \"bar\" } }"));
+    EXPECT_NE(*efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\" ], \"item3\": { \"foo\": \"bar\" } }"), *efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\" ], \"item3\": { \"foo\": \"bar2\" } }"));
+    EXPECT_NE(*efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\" ], \"item3\": { \"foo\": \"bar\" } }"), *efs("{ \"item1\": 1, \"item2\": [ \"a\", \"list\", 1 ], \"item3\": { \"foo\": \"bar\" } }"));
+    EXPECT_NE(*efs("{ \"foo\": \"bar\" }"), *efs("1"));
+    EXPECT_NE(*efs("{ \"foo\": \"bar\" }"), *efs("\"1\""));
+    EXPECT_NE(*efs("{ \"foo\": \"bar\" }"), *efs("[]"));
+    EXPECT_NE(*efs("{ \"foo\": \"bar\" }"), *efs("{}"));
+    EXPECT_NE(*efs("{ \"foo\": \"bar\" }"), *efs("{ \"something\": \"different\" }"));
+
+    EXPECT_EQ(*efs("null"), *Element::create());
+}
+
+TEST(Element, removeIdentical) {
+    ElementPtr a = Element::createMap();
+    ConstElementPtr b = Element::createMap();
+    ConstElementPtr c = Element::createMap();
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1 }");
+    b = Element::fromJSON("{ \"a\": 1 }");
+    c = Element::createMap();
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::createMap();
+    c = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    c = Element::createMap();
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 3 ] }");
+    c = Element::fromJSON("{ \"b\": [ 1, 2 ] }");
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::createMap();
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    c = Element::createMap();
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"d\" } }");
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": 2, \"c\": 3 }");
+    b = Element::fromJSON("{ \"c\": 3, \"b\": 2 }");
+    c = Element::fromJSON("{ \"a\": 1 }");
+    removeIdentical(a, b);
+    EXPECT_EQ(*a, *c);
+
+    EXPECT_THROW(removeIdentical(Element::create(1), Element::create(2)), TypeError);
+}
+
+TEST(Element, constRemoveIdentical) {
+    ConstElementPtr a = Element::createMap();
+    ConstElementPtr b = Element::createMap();
+    ConstElementPtr c = Element::createMap();
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": 1 }");
+    b = Element::fromJSON("{ \"a\": 1 }");
+    c = Element::createMap();
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::createMap();
+    c = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    c = Element::createMap();
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 2 ] }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": [ 1, 3 ] }");
+    c = Element::fromJSON("{ \"b\": [ 1, 2 ] }");
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::createMap();
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    c = Element::createMap();
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"d\" } }");
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": 2, \"c\": 3 }");
+    b = Element::fromJSON("{ \"c\": 3, \"b\": 2 }");
+    c = Element::fromJSON("{ \"a\": 1 }");
+    EXPECT_EQ(*removeIdentical(a, b), *c);
+
+    // removeIdentical() is overloaded so force the first argument to const
+    ConstElementPtr bad = Element::create(1);
+    EXPECT_THROW(removeIdentical(bad, Element::create(2)), TypeError);
+}
+
+TEST(Element, merge) {
+    ElementPtr a = Element::createMap();
+    ElementPtr b = Element::createMap();
+    ConstElementPtr c = Element::createMap();
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("1");
+    b = Element::createMap();
+    EXPECT_THROW(merge(a, b), TypeError);
+
+    a = Element::createMap();
+    b = Element::fromJSON("{ \"a\": 1 }");
+    c = Element::fromJSON("{ \"a\": 1 }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::createMap();
+    b = Element::fromJSON("{ \"a\": 1 }");
+    c = Element::fromJSON("{ \"a\": 1 }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+    a = Element::fromJSON("{ \"a\": 1 }");
+    b = Element::fromJSON("{ \"a\": 2 }");
+    c = Element::fromJSON("{ \"a\": 2 }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1 }");
+    b = Element::fromJSON("{ \"a\": 2 }");
+    c = Element::fromJSON("{ \"a\": 1 }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"d\" } }");
+    c = Element::fromJSON("{ \"a\": { \"b\": \"d\" } }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": { \"b\": \"d\" } }");
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": null }");
+    c = Element::fromJSON("{  }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    b = Element::fromJSON("{ \"a\": null }");
+    c = Element::fromJSON("{ \"a\": { \"b\": \"c\" } }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+    // And some tests with multiple values
+    a = Element::fromJSON("{ \"a\": 1, \"b\": true, \"c\": null }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": null, \"c\": \"a string\" }");
+    c = Element::fromJSON("{ \"a\": 1, \"c\": \"a string\" }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": true, \"c\": null }");
+    b = Element::fromJSON("{ \"a\": 1, \"b\": null, \"c\": \"a string\" }");
+    c = Element::fromJSON("{ \"a\": 1, \"b\": true }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": 2, \"c\": 3 }");
+    b = Element::fromJSON("{ \"a\": 3, \"b\": 2, \"c\": 1 }");
+    c = Element::fromJSON("{ \"a\": 3, \"b\": 2, \"c\": 1 }");
+    merge(a, b);
+    EXPECT_EQ(*a, *c);
+
+    a = Element::fromJSON("{ \"a\": 1, \"b\": 2, \"c\": 3 }");
+    b = Element::fromJSON("{ \"a\": 3, \"b\": 2, \"c\": 1 }");
+    c = Element::fromJSON("{ \"a\": 1, \"b\": 2, \"c\": 3 }");
+    merge(b, a);
+    EXPECT_EQ(*b, *c);
+
+}
+
+// This test checks copy.
+TEST(Element, copy) {
+    // Null pointer
+    ElementPtr elem;
+    EXPECT_THROW(copy(elem, 0), isc::BadValue);
+    EXPECT_THROW(copy(elem), isc::BadValue);
+    EXPECT_THROW(copy(elem, -1), isc::BadValue);
+
+    // Basic types
+    elem.reset(new IntElement(1));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("1")));
+    EXPECT_EQ("1", elem->str());
+    ElementPtr copied;
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+
+    elem.reset(new DoubleElement(1.0));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("1.0")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+
+    elem.reset(new BoolElement(true));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("true")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+
+    elem.reset(new NullElement());
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("null")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+
+    elem.reset(new StringElement("foo"));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("\"foo\"")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+    ASSERT_NO_THROW(elem->setValue(std::string("bar")));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("\"bar\"")));
+    EXPECT_FALSE(elem->equals(*copied));
+
+    elem.reset(new ListElement());
+    ElementPtr item = ElementPtr(new IntElement(1));
+    elem->add(item);
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("[ 1 ]")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+    ElementPtr deep;
+    ASSERT_NO_THROW(deep = copy(elem));
+    EXPECT_TRUE(elem->equals(*deep));
+    ASSERT_NO_THROW(item = elem->getNonConst(0));
+    ASSERT_NO_THROW(item->setValue(2));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("[ 2 ]")));
+    EXPECT_TRUE(elem->equals(*copied));
+    EXPECT_FALSE(elem->equals(*deep));
+
+    elem.reset(new MapElement());
+    item.reset(new StringElement("bar"));
+    elem->set("foo", item);
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("{ \"foo\": \"bar\" }")));
+    ASSERT_NO_THROW(copied = copy(elem, 0));
+    EXPECT_TRUE(elem->equals(*copied));
+    ASSERT_NO_THROW(deep = copy(elem));
+    EXPECT_TRUE(elem->equals(*deep));
+    ASSERT_NO_THROW(item->setValue(std::string("Bar")));
+    EXPECT_TRUE(elem->equals(*Element::fromJSON("{ \"foo\": \"Bar\" }")));
+    EXPECT_TRUE(elem->equals(*copied));
+    EXPECT_FALSE(elem->equals(*deep));
+
+    // Complex example
+    std::string input = "{ \n"
+        "\"integer\": 1,\n"
+        "\"double\": 1.0,\n"
+        "\"boolean\": true,\n"
+        "\"null\": null,\n"
+        "\"string\": \"foobar\",\n"
+        "\"list\": [ 1, 2 ],\n"
+        "\"map\": { \"foo\": \"bar\" } }\n";
+    ConstElementPtr complex;
+    ASSERT_NO_THROW(complex = Element::fromJSON(input));
+    ASSERT_NO_THROW(copied = copy(complex, 0));
+    EXPECT_TRUE(copied->equals(*complex));
+    ASSERT_NO_THROW(deep = copy(complex));
+    EXPECT_TRUE(deep->equals(*complex));
+    ElementPtr shallow;
+    ASSERT_NO_THROW(shallow = copy(complex, 1));
+    EXPECT_TRUE(shallow->equals(*complex));
+    // Try to modify copies
+    ASSERT_NO_THROW(item = deep->get("list")->getNonConst(1));
+    ASSERT_NO_THROW(item->setValue(3));
+    EXPECT_FALSE(deep->equals(*complex));
+    EXPECT_TRUE(shallow->equals(*complex));
+    ASSERT_NO_THROW(item = boost::const_pointer_cast<Element>(shallow->get("string")));
+    ASSERT_NO_THROW(item->setValue(std::string("FooBar")));
+    EXPECT_FALSE(shallow->equals(*complex));
+    EXPECT_TRUE(copied->equals(*complex));
+}
+
+// This test checks the isEquivalent function.
+TEST(Element, isEquivalent) {
+    // All are different but a is equivalent to b
+    string texta = "{ \"a\": 1, \"b\": [ ], \"c\": [ 1, 1, 2 ] }";
+    string textb = "{ \"b\": [ ], \"a\": 1, \"c\": [ 1, 2, 1 ] }";
+    string textc = "{ \"a\": 2, \"b\": [ ], \"c\": [ 1, 1, 2 ] }";
+    string textd = "{ \"a\": 1, \"c\": [ ], \"b\": [ 1, 1, 2 ] }";
+    string texte = "{ \"a\": 1, \"b\": [ ], \"c\": [ 1, 2, 2 ] }";
+
+    ElementPtr a = Element::fromJSON(texta);
+    ElementPtr b = Element::fromJSON(textb);
+    ElementPtr c = Element::fromJSON(textc);
+    ElementPtr d = Element::fromJSON(textd);
+    ElementPtr e = Element::fromJSON(texte);
+
+    EXPECT_TRUE(isEquivalent(a, b));
+    EXPECT_NE(a, b);
+    EXPECT_FALSE(isEquivalent(a, c));
+    EXPECT_FALSE(isEquivalent(a, d));
+    EXPECT_FALSE(isEquivalent(a, e));
+
+    // Verifies isEquivalent handles cycles
+    if (isc::util::unittests::runningOnValgrind()) {
+        ElementPtr l = Element::createList();
+        l->add(l);
+        EXPECT_THROW(isEquivalent(l, l), isc::BadValue);
+    }
+}
+
+// This test checks the pretty print function.
+TEST(Element, prettyPrint) {
+
+    // default step is 2, order is alphabetic, no \n at the end
+    string text = "{\n"
+        "  \"boolean\": true,\n"
+        "  \"comment\": \"this is an exception\",\n"
+        "  \"empty-list\": [ ],\n"
+        "  \"empty-map\": { },\n"
+        "  \"integer\": 1,\n"
+        "  \"list\": [ 1, 2, 3 ],\n"
+        "  \"map\": {\n"
+        "    \"item\": null\n"
+        "  },\n"
+        "  \"string\": \"foobar\"\n"
+        "}";
+    ElementPtr json = Element::fromJSON(text);
+    string pprinted = prettyPrint(json);
+    EXPECT_EQ(text, pprinted);
+}
+
+// This test checks whether it is possible to ignore comments. It also checks
+// that the comments are ignored only when told to.
+TEST(Element, preprocessor) {
+
+    string no_comment = "{ \"a\": 1,\n"
+                        " \"b\": 2}";
+
+    string head_comment = "# this is a comment, ignore me\n"
+                          "{ \"a\": 1,\n"
+                          " \"b\": 2}";
+
+    string mid_comment = "{ \"a\": 1,\n"
+                         "# this is a comment, ignore me\n"
+                         " \"b\": 2}";
+
+    string tail_comment = "{ \"a\": 1,\n"
+                          " \"b\": 2}"
+                          "# this is a comment, ignore me\n";
+
+    string dbl_head_comment = "# this is a comment, ignore me\n"
+                              "# second line, still ignored\n"
+                              "{ \"a\": 1,\n"
+                              " \"b\": 2}";
+
+    string dbl_mid_comment = "{ \"a\": 1,\n"
+                             "# this is a comment, ignore me\n"
+                             "# second line, still ignored\n"
+                             " \"b\": 2}";
+
+    string dbl_tail_comment = "{ \"a\": 1,\n"
+                              " \"b\": 2}"
+                              "# this is a comment, ignore me\n"
+                              "# second line, still ignored\n";
+
+    // This is what we expect in all cases.
+    ElementPtr exp = Element::fromJSON(no_comment);
+
+    // Let's convert them all and see that the result it the same every time
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(head_comment, true)));
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(mid_comment, true)));
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(tail_comment, true)));
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(dbl_head_comment, true)));
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(dbl_mid_comment, true)));
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(dbl_tail_comment, true)));
+
+    // With preprocessing disabled, it should fail all around
+    EXPECT_THROW(Element::fromJSON(head_comment), JSONError);
+    EXPECT_THROW(Element::fromJSON(mid_comment), JSONError);
+    EXPECT_THROW(Element::fromJSON(tail_comment), JSONError);
+    EXPECT_THROW(Element::fromJSON(dbl_head_comment), JSONError);
+    EXPECT_THROW(Element::fromJSON(dbl_mid_comment), JSONError);
+    EXPECT_THROW(Element::fromJSON(dbl_tail_comment), JSONError);
+
+    // For coverage
+    std::istringstream iss(no_comment);
+    EXPECT_TRUE(exp->equals(*Element::fromJSON(iss, true)));
+}
+
+TEST(Element, getPosition) {
+    std::istringstream ss("{\n"
+                          "    \"a\":  2,\n"
+                          "    \"b\":true,\n"
+                          "    \"cy\": \"a string\",\n"
+                          "    \"dyz\": {\n"
+                          "\n"
+                          "      \"e\": 3,\n"
+                          "        \"f\": null\n"
+                          "\n"
+                          "    },\n"
+                          "    \"g\": [ 5, 6,\n"
+                          "             7 ]\n"
+                          "}\n");
+
+    // Create a JSON string holding different type of values. Some of the
+    // values in the config string are not aligned, so as we can check that
+    // the position is set correctly for the elements.
+    ElementPtr top = Element::fromJSON(ss, string("kea.conf"));
+    ASSERT_TRUE(top);
+
+    // Element "a"
+    ConstElementPtr level1_el = top->get("a");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(2, level1_el->getPosition().line_);
+    EXPECT_EQ(11, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "b"
+    level1_el = top->get("b");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(3, level1_el->getPosition().line_);
+    EXPECT_EQ(9, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "cy"
+    level1_el = top->get("cy");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(4, level1_el->getPosition().line_);
+    EXPECT_EQ(11, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "dyz"
+    level1_el = top->get("dyz");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(5, level1_el->getPosition().line_);
+    EXPECT_EQ(13, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "e" is a sub element of "dyz".
+    ConstElementPtr level2_el = level1_el->get("e");
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(7, level2_el->getPosition().line_);
+    EXPECT_EQ(12, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+    // Element "f" is also a sub element of "dyz"
+    level2_el = level1_el->get("f");
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(8, level2_el->getPosition().line_);
+    EXPECT_EQ(14, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+    // Element "g" is a list.
+    level1_el = top->get("g");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(11, level1_el->getPosition().line_);
+    // Position indicates where the values start (excluding the "[" character)"
+    EXPECT_EQ(11, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // First element from the list.
+    level2_el = level1_el->get(0);
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(11, level2_el->getPosition().line_);
+    EXPECT_EQ(12, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+    // Second element from the list.
+    level2_el = level1_el->get(1);
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(11, level2_el->getPosition().line_);
+    EXPECT_EQ(15, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+    // Third element from the list.
+    level2_el = level1_el->get(2);
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(12, level2_el->getPosition().line_);
+    EXPECT_EQ(14, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+}
+
+// Tests whether position is returned properly for a commented input JSON text.
+TEST(Element, getPositionCommented) {
+    std::istringstream ss("{\n"
+                          "    \"a\":  2,\n"
+                          "# comment\n"
+                          "    \"cy\": \"a string\",\n"
+                          "    \"dyz\": {\n"
+                          "# another comment\n"
+                          "      \"e\": 3,\n"
+                          "        \"f\": null\n"
+                          "\n"
+                          "    } }\n");
+
+    // Create a JSON string holding different type of values. Some of the
+    // values in the config string are not aligned, so as we can check that
+    // the position is set correctly for the elements.
+    ElementPtr top = Element::fromJSON(ss, string("kea.conf"), true);
+    ASSERT_TRUE(top);
+
+    // Element "a"
+    ConstElementPtr level1_el = top->get("a");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(2, level1_el->getPosition().line_);
+    EXPECT_EQ(11, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "cy"
+    level1_el = top->get("cy");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(4, level1_el->getPosition().line_);
+    EXPECT_EQ(11, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "dyz"
+    level1_el = top->get("dyz");
+    ASSERT_TRUE(level1_el);
+    EXPECT_EQ(5, level1_el->getPosition().line_);
+    EXPECT_EQ(13, level1_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level1_el->getPosition().file_);
+
+    // Element "e" is a sub element of "dyz".
+    ConstElementPtr level2_el = level1_el->get("e");
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(7, level2_el->getPosition().line_);
+    EXPECT_EQ(12, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+
+    // Element "f" is also a sub element of "dyz"
+    level2_el = level1_el->get("f");
+    ASSERT_TRUE(level2_el);
+    EXPECT_EQ(8, level2_el->getPosition().line_);
+    EXPECT_EQ(14, level2_el->getPosition().pos_);
+    EXPECT_EQ("kea.conf", level2_el->getPosition().file_);
+}
+
+TEST(Element, empty) {
+
+    // Let's try Map first
+    ElementPtr m = Element::createMap();
+    EXPECT_TRUE(m->empty());
+    m->set("something", Element::create(123));
+    EXPECT_FALSE(m->empty());
+    m->remove("something");
+    EXPECT_TRUE(m->empty());
+
+    // Now do the same with list
+    ElementPtr l = Element::createList();
+    EXPECT_TRUE(l->empty());
+    l->add(Element::create(123));
+    EXPECT_FALSE(l->empty());
+    l->remove(0);
+    EXPECT_TRUE(l->empty());
+}
+
+TEST(Element, sortIntegers) {
+    ElementPtr l(Element::fromJSON("[5, 7, 4, 2, 8, 6, 1, 9, 0, 3]"));
+    ElementPtr expected(Element::fromJSON("[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]"));
+    boost::dynamic_pointer_cast<ListElement>(l)->sort();
+    EXPECT_EQ(*l, *expected);
+}
+
+TEST(Element, sortFloatingPoint) {
+    ElementPtr l(Element::fromJSON("[2.1, 3.2, 2.1, 2.2, 4.1, 3.2, 1.1, 4.2, 0.1, 1.2]"));
+    ElementPtr expected(Element::fromJSON("[0.1, 1.1, 1.2, 2.1, 2.1, 2.2, 3.2, 3.2, 4.1, 4.2]"));
+    boost::dynamic_pointer_cast<ListElement>(l)->sort();
+    EXPECT_EQ(*l, *expected);
+}
+
+TEST(Element, sortBooleans) {
+    ElementPtr l(Element::fromJSON("[false, true, false, true]"));
+    ElementPtr expected(Element::fromJSON("[false, false, true, true]"));
+    boost::dynamic_pointer_cast<ListElement>(l)->sort();
+    EXPECT_EQ(*l, *expected);
+}
+
+TEST(Element, sortStrings) {
+    ElementPtr l(Element::fromJSON(R"(["hello", "world", "lorem", "ipsum", "dolor", "sit", "amet"])"));
+    ElementPtr expected(Element::fromJSON(R"(["amet", "dolor", "hello", "ipsum", "lorem", "sit", "world"])"));
+    boost::dynamic_pointer_cast<ListElement>(l)->sort();
+    EXPECT_EQ(*l, *expected);
+}
+
+TEST(Element, sortMaps) {
+    ElementPtr e1(Element::fromJSON(R"({"id": 1, "subnet": "10.0.2.0/24"})"));
+    ElementPtr e2(Element::fromJSON(R"({"id": 2, "subnet": "10.0.1.0/24"})"));
+    ElementPtr l;
+
+    // Test sorting by "id". Order shouldn't change.
+    l = Element::createList();
+    l->add(e1);
+    l->add(e2);
+    boost::dynamic_pointer_cast<ListElement>(l)->sort("id");
+    ASSERT_EQ(l->size(), 2);
+    EXPECT_EQ(*l->get(0), *e1);
+    EXPECT_EQ(*l->get(1), *e2);
+
+    // Test sorting by "id". Order should change.
+    l = Element::createList();
+    l->add(e2);
+    l->add(e1);
+    boost::dynamic_pointer_cast<ListElement>(l)->sort("id");
+    ASSERT_EQ(l->size(), 2);
+    EXPECT_EQ(*l->get(0), *e1);
+    EXPECT_EQ(*l->get(1), *e2);
+
+    // Test sorting by "subnet". Order should change.
+    l = Element::createList();
+    l->add(e1);
+    l->add(e2);
+    boost::dynamic_pointer_cast<ListElement>(l)->sort("subnet");
+    ASSERT_EQ(l->size(), 2);
+    EXPECT_EQ(*l->get(0), *e2);
+    EXPECT_EQ(*l->get(1), *e1);
+
+    // Test sorting by "subnet". Order shouldn't change.
+    l = Element::createList();
+    l->add(e2);
+    l->add(e1);
+    boost::dynamic_pointer_cast<ListElement>(l)->sort("subnet");
+    ASSERT_EQ(l->size(), 2);
+    EXPECT_EQ(*l->get(0), *e2);
+    EXPECT_EQ(*l->get(1), *e1);
+}
+
+TEST(Element, removeEmptyContainersRecursively) {
+    ElementPtr e(Element::fromJSON(R"(
+{
+  "list": [
+    {
+      "nested-list": [
+        {
+          "nestedx2-list": [
+            {}
+          ]
+        }
+      ]
+    }
+  ],
+  "map": {
+    "nested-map": {
+      "nestedx2-map": {}
+    }
+  },
+  "simple-list": {},
+  "simple-map": {}
+}
+)"));
+    e->removeEmptyContainersRecursively();
+    EXPECT_EQ(*e, *Element::fromJSON("{}"));
+
+    e = Element::fromJSON(R"(
+{
+  "list": [
+    {
+      "value": "not empty anymore",
+      "nested-list": [
+        {
+          "nestedx2-list": [
+            {}
+          ]
+        }
+      ]
+    }
+  ],
+  "map": {
+    "value": "not empty anymore",
+    "nested-map": {
+      "nestedx2-map": {}
+    }
+  },
+  "simple-list": {},
+  "simple-map": {}
+}
+)");
+    e->removeEmptyContainersRecursively();
+    EXPECT_EQ(*e, *Element::fromJSON(R"(
+{
+  "list": [
+    {
+      "value": "not empty anymore"
+    }
+  ],
+  "map": {
+    "value": "not empty anymore"
+  }
+}
+)"));
+}
+
+/// @brief Function which creates an imaginary configuration hierarchy used to
+/// test mergeDiffAdd, mergeDiffDel and extend.
+///
+/// @param any Flag which indicates if traversing the hierarchy should use exact
+/// element match or not.
+isc::data::HierarchyDescriptor createHierarchy(bool any = false) {
+    auto const& element_empty = [](ElementPtr& element) {
+        for (auto const& kv : element->mapValue()) {
+            auto const& key = kv.first;
+            if (key != "id") {
+                return (false);
+            }
+        }
+        return (true);
+    };
+    auto const& element_match = [](ElementPtr& left, ElementPtr& right) -> bool {
+        return (left->get("id")->intValue() == right->get("id")->intValue());
+    };
+    auto const& element_any_match = [](ElementPtr&, ElementPtr&) -> bool {
+        return (true);
+    };
+    auto const& element_is_key = [](const std::string& key) -> bool {
+        return (key == "id");
+    };
+    isc::data::HierarchyDescriptor hierarchy = {
+        { { "root", { element_match, element_empty, element_is_key } } },
+        { { "elements", { element_match, element_empty, element_is_key } },
+          { "elements-other", { element_match, element_empty, element_is_key } } }
+    };
+    if (any) {
+        hierarchy = {
+            { { "root", { element_any_match, element_empty, element_is_key } } },
+            { { "elements", { element_any_match, element_empty, element_is_key } },
+              { "elements-other", { element_any_match, element_empty, element_is_key } } }
+        };
+    }
+    return (hierarchy);
+}
+
+/// @brief Test which checks that mergeDiffAdd throws if called with wrong
+/// element types.
+TEST(Element, mergeDiffAddBadParams) {
+    {
+        SCOPED_TRACE("root bad scalars");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(true);
+        ElementPtr right = Element::create("false");
+        ASSERT_THROW(mergeDiffAdd(left, right, hierarchy, ""), TypeError);
+    }
+    {
+        SCOPED_TRACE("map bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::createList());
+        right->set("elements", Element::createMap());
+        ASSERT_THROW(mergeDiffAdd(left, right, hierarchy, "root"), TypeError);
+    }
+    {
+        SCOPED_TRACE("list bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::createMap());
+        right_right->set("id", Element::create(0));
+        right_right->set("elements", Element::createList());
+        left->add(left_left);
+        right->add(right_right);
+        ASSERT_THROW(mergeDiffAdd(left, right, hierarchy, "root"), TypeError);
+    }
+}
+
+/// @brief Test which checks that mergeDiffAdd works as expected.
+TEST(Element, mergeDiffAdd) {
+    {
+        SCOPED_TRACE("scalar bool");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(true);
+        ElementPtr right = Element::create(false);
+        EXPECT_NE(left->boolValue(), right->boolValue());
+        mergeDiffAdd(left, right, hierarchy, "");
+        EXPECT_EQ(left->boolValue(), right->boolValue());
+        std::string expected_str("false");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar int");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(1);
+        ElementPtr right = Element::create(2);
+        EXPECT_NE(left->intValue(), right->intValue());
+        mergeDiffAdd(left, right, hierarchy, "");
+        EXPECT_EQ(left->intValue(), right->intValue());
+        std::string expected_str("2");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar double");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(0.1);
+        ElementPtr right = Element::create(0.2);
+        EXPECT_NE(left->doubleValue(), right->doubleValue());
+        mergeDiffAdd(left, right, hierarchy, "");
+        EXPECT_EQ(left->doubleValue(), right->doubleValue());
+        std::string expected_str("0.2");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar string");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create("left");
+        ElementPtr right = Element::create("right");
+        EXPECT_NE(left->stringValue(), right->stringValue());
+        mergeDiffAdd(left, right, hierarchy, "");
+        EXPECT_EQ(left->stringValue(), right->stringValue());
+        std::string expected_str("\"right\"");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::create("left"));
+        left->set("other-elements", Element::create("other"));
+        // scalar element which is updated
+        right->set("elements", Element::create("right"));
+        // scalar element which is added
+        right->set("new-elements", Element::create("new"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffAdd(left, right, hierarchy, "");
+        std::string expected_str("{ \"elements\": \"right\", \"new-elements\": \"new\", \"other-elements\": \"other\" }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in list");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        left->add(Element::create("left"));
+        left->add(Element::create("other"));
+        left->add(Element::create("test"));
+        // scalar element which is added
+        right->add(Element::create("right"));
+        // scalar element which is added
+        right->add(Element::create("new"));
+        // scalar element which already exists but is still added
+        right->add(Element::create("test"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffAdd(left, right, hierarchy, "");
+        std::string expected_str("[ \"left\", \"other\", \"test\", \"right\", \"new\", \"test\" ]");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar and list and map in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(0));
+        // scalar element which is updated
+        right_right->set("elements", Element::create("right"));
+        // scalar element which is added
+        right_right->set("new-elements", Element::create("new"));
+        ElementPtr left_other_left = Element::createMap();
+        ElementPtr right_other_right = Element::createMap();
+        left_other_left->set("id", Element::create(1));
+        left_other_left->set("elements", Element::create("other-left"));
+        // scalar element used as key
+        right_other_right->set("id", Element::create(2));
+        // scalar element which is added
+        right_other_right->set("elements", Element::create("other-right"));
+        left->set("elements", left_left);
+        left->set("left-other-elements", left_other_left);
+        // map element which is added
+        right->set("right-other-elements", right_other_right);
+        // map element which is updated
+        right->set("elements", right_right);
+        left_other_left = Element::createList();
+        right_other_right = Element::createList();
+        left_other_left->add(Element::create("left-other-left"));
+        left_other_left->add(Element::create("left-other-left-other"));
+        left_other_left->add(Element::create("other-other"));
+        // scalar element which is added
+        right_other_right->add(Element::create("right-other-right"));
+        // scalar element which is added
+        right_other_right->add(Element::create("right-other-right-other"));
+        // scalar element which already exists but is still added
+        right_other_right->add(Element::create("other-other"));
+        left->set("other", left_other_left);
+        // list element which is updated
+        right->set("other", right_other_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffAdd(left, right, hierarchy, "root");
+        std::string expected_str("{ \"elements\": { \"elements\": \"right\", \"id\": 0, \"new-elements\": \"new\", \"other-elements\": \"other\" }, "
+                                   "\"left-other-elements\": { \"elements\": \"other-left\", \"id\": 1 }, "
+                                   "\"other\": [ \"left-other-left\", \"left-other-left-other\", \"other-other\", \"right-other-right\", \"right-other-right-other\", \"other-other\" ], "
+                                   "\"right-other-elements\": { \"elements\": \"other-right\", \"id\": 2 } }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar and list and map in list");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(0));
+        // scalar element which is updated
+        right_right->set("elements", Element::create("right"));
+        // scalar element which is added
+        right_right->set("new-elements", Element::create("new"));
+        ElementPtr left_other_left = Element::createMap();
+        ElementPtr right_other_right = Element::createMap();
+        left_other_left->set("id", Element::create(1));
+        left_other_left->set("elements", Element::create("other-left"));
+        // scalar element used as key
+        right_other_right->set("id", Element::create(2));
+        // scalar element which is added
+        right_other_right->set("elements", Element::create("other-right"));
+        left->add(left_left);
+        left->add(left_other_left);
+        // map element which is added
+        right->add(right_other_right);
+        // map element which is updated
+        right->add(right_right);
+        left_other_left = Element::createList();
+        right_other_right = Element::createList();
+        left_other_left->add(Element::create("left-other-left"));
+        left_other_left->add(Element::create("left-other-left-other"));
+        left_other_left->add(Element::create("other-other"));
+        // scalar element which is added
+        right_other_right->add(Element::create("right-other-right"));
+        // scalar element which is added
+        right_other_right->add(Element::create("right-other-right-other"));
+        // scalar element which already exists but is still added
+        right_other_right->add(Element::create("other-other"));
+        left_left->set("other", left_other_left);
+        // list element which is updated
+        right_right->set("other", right_other_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffAdd(left, right, hierarchy, "root");
+        std::string expected_str("[ { \"elements\": \"right\", \"id\": 0, \"new-elements\": \"new\", "
+                                     "\"other\": [ \"left-other-left\", \"left-other-left-other\", \"other-other\", \"right-other-right\", \"right-other-right-other\", \"other-other\" ], "
+                                     "\"other-elements\": \"other\" }, "
+                                   "{ \"elements\": \"other-left\", \"id\": 1 }, "
+                                   "{ \"elements\": \"other-right\", \"id\": 2 } ]");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+}
+
+/// @brief Test which checks that mergeDiffDel throws if called with wrong
+/// element types.
+TEST(Element, mergeDiffDelBadParams) {
+    {
+        SCOPED_TRACE("root bad scalars");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(true);
+        ElementPtr right = Element::create("false");
+        ASSERT_THROW(mergeDiffDel(left, right, hierarchy, ""), TypeError);
+    }
+    {
+        SCOPED_TRACE("map bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::createList());
+        right->set("elements", Element::createMap());
+        ASSERT_THROW(mergeDiffDel(left, right, hierarchy, "root"), TypeError);
+    }
+    {
+        SCOPED_TRACE("list bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::createMap());
+        right_right->set("id", Element::create(0));
+        right_right->set("elements", Element::createList());
+        left->add(left_left);
+        right->add(right_right);
+        ASSERT_THROW(mergeDiffDel(left, right, hierarchy, "root"), TypeError);
+    }
+}
+
+/// @brief Test which checks that mergeDiffDel works as expected.
+TEST(Element, mergeDiffDel) {
+    {
+        SCOPED_TRACE("scalar bool");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(true);
+        ElementPtr right = Element::create(false);
+        EXPECT_NE(left->boolValue(), right->boolValue());
+        mergeDiffDel(left, right, hierarchy, "");
+        EXPECT_EQ(left->getType(), Element::null);
+    }
+    {
+        SCOPED_TRACE("scalar int");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(1);
+        ElementPtr right = Element::create(2);
+        EXPECT_NE(left->intValue(), right->intValue());
+        mergeDiffDel(left, right, hierarchy, "");
+        EXPECT_EQ(left->getType(), Element::null);
+    }
+    {
+        SCOPED_TRACE("scalar double");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(0.1);
+        ElementPtr right = Element::create(0.2);
+        EXPECT_NE(left->doubleValue(), right->doubleValue());
+        mergeDiffDel(left, right, hierarchy, "");
+        EXPECT_EQ(left->getType(), Element::null);
+    }
+    {
+        SCOPED_TRACE("scalar string");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create("left");
+        ElementPtr right = Element::create("right");
+        EXPECT_NE(left->stringValue(), right->stringValue());
+        mergeDiffDel(left, right, hierarchy, "");
+        EXPECT_EQ(left->getType(), Element::null);
+    }
+    {
+        SCOPED_TRACE("scalar in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::create("left"));
+        left->set("other-elements", Element::create("other"));
+        // scalar element which is removed
+        right->set("elements", Element::create("right"));
+        // scalar element which does not exist and does nothing
+        right->set("new-elements", Element::create("new"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffDel(left, right, hierarchy, "root");
+        std::string expected_str("{ \"other-elements\": \"other\" }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in list");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        left->add(Element::create("left"));
+        left->add(Element::create("other"));
+        left->add(Element::create("other-left"));
+        left->add(Element::create("new"));
+        // scalar element which does not exist and does nothing
+        right->add(Element::create("right"));
+        // scalar element which is removed
+        right->add(Element::create("other"));
+        // scalar element which does not exist and does nothing
+        right->add(Element::create("other-right"));
+        // scalar element which is removed
+        right->add(Element::create("new"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffDel(left, right, hierarchy, "");
+        std::string expected_str("[ \"left\", \"other-left\" ]");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar and list and map in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(0));
+        // scalar element which is removed
+        right_right->set("elements", Element::create("right"));
+        // scalar element which does not exist and does nothing
+        right_right->set("new-elements", Element::create("new"));
+        ElementPtr left_other_left = Element::createMap();
+        ElementPtr right_other_right = Element::createMap();
+        left_other_left->set("id", Element::create(1));
+        left_other_left->set("elements", Element::create("other-left"));
+        // scalar element used as key
+        right_other_right->set("id", Element::create(2));
+        // scalar element which does not exist and does nothing
+        right_other_right->set("elements", Element::create("other-right"));
+        left->set("elements", left_left);
+        left->set("left-other-elements", left_other_left);
+        // map element which does not exist and does nothing
+        right->set("right-other-elements", right_other_right);
+        // map element which is updated
+        right->set("elements", right_right);
+        left_other_left = Element::createList();
+        right_other_right = Element::createList();
+        left_other_left->add(Element::create("left-other-left"));
+        left_other_left->add(Element::create("other"));
+        left_other_left->add(Element::create("left-other-left-other"));
+        left_other_left->add(Element::create("new"));
+        // scalar element which does not exist and does nothing
+        right_other_right->add(Element::create("right-other-right"));
+        // scalar element which is removed
+        right_other_right->add(Element::create("other"));
+        // scalar element which does not exist and does nothing
+        right_other_right->add(Element::create("right-other-right-other"));
+        // scalar element which is removed
+        right_other_right->add(Element::create("new"));
+        left->set("other", left_other_left);
+        // list element which is updated
+        right->set("other", right_other_right);
+        left_left = Element::createMap();
+        right_right = Element::createMap();
+        left_left->set("id", Element::create(3));
+        left_left->set("elements", Element::create("new-left"));
+        left_left->set("other-elements", Element::create("new-other"));
+        left->set("elements-other", left_left);
+        // scalar element used as key
+        right_right->set("id", Element::create(3));
+        // map element which is not removed because it is contained in a map and
+        // the key can not be removed
+        right->set("elements-other", right_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffDel(left, right, hierarchy, "root");
+        std::string expected_str("{ \"elements\": { \"id\": 0, \"other-elements\": \"other\" }, "
+                                   "\"elements-other\": { \"elements\": \"new-left\", \"id\": 3, \"other-elements\": \"new-other\" }, "
+                                   "\"left-other-elements\": { \"elements\": \"other-left\", \"id\": 1 }, "
+                                   "\"other\": [ \"left-other-left\", \"left-other-left-other\" ] }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar and list and map in list");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(0));
+        // scalar element which is removed
+        right_right->set("elements", Element::create("right"));
+        // scalar element which does not exist and does nothing
+        right_right->set("new-elements", Element::create("new"));
+        ElementPtr left_other_left = Element::createMap();
+        ElementPtr right_other_right = Element::createMap();
+        left_other_left->set("id", Element::create(1));
+        left_other_left->set("elements", Element::create("other-left"));
+        // scalar element used as key
+        right_other_right->set("id", Element::create(2));
+        // scalar element which does not exist and does nothing
+        right_other_right->set("elements", Element::create("other-right"));
+        left->add(left_left);
+        left->add(left_other_left);
+        // map element which does not exist and does nothing
+        right->add(right_other_right);
+        // map element which is updated
+        right->add(right_right);
+        left_other_left = Element::createList();
+        right_other_right = Element::createList();
+        left_other_left->add(Element::create("left-other-left"));
+        left_other_left->add(Element::create("other"));
+        left_other_left->add(Element::create("left-other-left-other"));
+        left_other_left->add(Element::create("new"));
+        // scalar element which does not exist and does nothing
+        right_other_right->add(Element::create("right-other-right"));
+        // scalar element which is removed
+        right_other_right->add(Element::create("other"));
+        // scalar element which does not exist and does nothing
+        right_other_right->add(Element::create("right-other-right-other"));
+        // scalar element which is removed
+        right_other_right->add(Element::create("new"));
+        left_left->set("other", left_other_left);
+        // list element which is updated
+        right_right->set("other", right_other_right);
+        left_left = Element::createMap();
+        right_right = Element::createMap();
+        left_left->set("id", Element::create(3));
+        left_left->set("elements", Element::create("new-left"));
+        left_left->set("other-elements", Element::create("new-other"));
+        left->add(left_left);
+        // scalar element used as key
+        right_right->set("id", Element::create(3));
+        // map element which is removed by key
+        // the key can not be removed
+        right->add(right_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        mergeDiffDel(left, right, hierarchy, "root");
+        std::string expected_str("[ { \"id\": 0, \"other\": [ \"left-other-left\", \"left-other-left-other\" ], \"other-elements\": \"other\" }, "
+                                   "{ \"elements\": \"other-left\", \"id\": 1 } ]");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+}
+
+/// @brief Test which checks that extend throws if called with wrong element
+/// types.
+TEST(Element, extendBadParam) {
+    {
+        SCOPED_TRACE("root bad scalars");
+        isc::data::HierarchyDescriptor hierarchy;
+        ElementPtr left = Element::create(true);
+        ElementPtr right = Element::create("false");
+        ASSERT_THROW(extend("elements", "", left, right, hierarchy, ""), TypeError);
+    }
+    {
+        SCOPED_TRACE("map bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::createList());
+        right->set("elements", Element::createMap());
+        ASSERT_THROW(extend("elements", "", left, right, hierarchy, "root"), TypeError);
+    }
+    {
+        SCOPED_TRACE("list bad elements");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy();
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::createMap());
+        right_right->set("id", Element::create(0));
+        right_right->set("elements", Element::createList());
+        left->add(left_left);
+        right->add(right_right);
+        ASSERT_THROW(extend("elements", "", left, right, hierarchy, "root"), TypeError);
+    }
+}
+
+/// @brief Test which checks that extend works as expected.
+TEST(Element, extend) {
+    {
+        SCOPED_TRACE("scalar in map but alter flag is not set");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy(true);
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::create("left"));
+        left->set("other-elements", Element::create("other"));
+        // scalar element which is not updated
+        right->set("elements", Element::create("right"));
+        // scalar element which is extended
+        right->set("new-elements", Element::create("new"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        extend("root", "new-elements", left, right, hierarchy, "root", 0, false);
+        std::string expected_str("{ \"elements\": \"left\", \"other-elements\": \"other\" }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy(true);
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        left->set("elements", Element::create("left"));
+        left->set("other-elements", Element::create("other"));
+        // scalar element which is not updated
+        right->set("elements", Element::create("right"));
+        // scalar element which is extended
+        right->set("new-elements", Element::create("new"));
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        extend("root", "new-elements", left, right, hierarchy, "root", 0, true);
+        std::string expected_str("{ \"elements\": \"left\", \"new-elements\": \"new\", \"other-elements\": \"other\" }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in map in map");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy(true);
+        ElementPtr left = Element::createMap();
+        ElementPtr right = Element::createMap();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(1));
+        // scalar element which is not updated
+        right_right->set("elements", Element::create("right"));
+        // scalar element which is extended
+        right_right->set("new-elements", Element::create("new"));
+        left->set("elements", left_left);
+        // map element which is used for extension
+        right->set("elements", right_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        extend("root", "new-elements", left, right, hierarchy, "root");
+        std::string expected_str("{ \"elements\": { \"elements\": \"left\", \"id\": 0, \"new-elements\": \"new\", \"other-elements\": \"other\" } }");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+    {
+        SCOPED_TRACE("scalar in map in list");
+        isc::data::HierarchyDescriptor hierarchy;
+        hierarchy = createHierarchy(true);
+        ElementPtr left = Element::createList();
+        ElementPtr right = Element::createList();
+        ElementPtr left_left = Element::createMap();
+        ElementPtr right_right = Element::createMap();
+        left_left->set("id", Element::create(0));
+        left_left->set("elements", Element::create("left"));
+        left_left->set("other-elements", Element::create("other"));
+        // scalar element used as key
+        right_right->set("id", Element::create(1));
+        // scalar element which is not updated
+        right_right->set("elements", Element::create("right"));
+        // scalar element which is extended
+        right_right->set("new-elements", Element::create("new"));
+        left->add(left_left);
+        // map element which is used for extension
+        right->add(right_right);
+        ASSERT_FALSE(isc::data::isEquivalent(left, right));
+        extend("root", "new-elements", left, right, hierarchy, "root");
+        std::string expected_str("[ { \"elements\": \"left\", \"id\": 0, \"new-elements\": \"new\", \"other-elements\": \"other\" } ]");
+        ElementPtr expected = Element::fromJSON(expected_str);
+        EXPECT_TRUE(isc::data::isEquivalent(left, expected))
+            << "Actual: " << left->str()
+            << "\nExpected: " << expected->str();
+    }
+}
+
+}  // namespace
diff --git a/src/lib/cc/tests/element_value_unittests.cc b/src/lib/cc/tests/element_value_unittests.cc
new file mode 100644
index 0000000..e284440
--- /dev/null
+++ b/src/lib/cc/tests/element_value_unittests.cc
@@ -0,0 +1,43 @@
+// Copyright (C) 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 <cc/element_value.h>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+
+namespace {
+
+// This test verifies that integer value can be extracted.
+TEST(ElementValue, intValue) {
+    EXPECT_EQ(5, ElementValue<int>()(Element::create(5)));
+    EXPECT_THROW(ElementValue<int>()(Element::create("hola!")),
+                 TypeError);
+}
+
+// This test verifies that double value can be extracted.
+TEST(ElementValue, doubleValue) {
+    EXPECT_EQ(1.4, ElementValue<double>()(Element::create(1.4)));
+    EXPECT_THROW(ElementValue<double>()(Element::create("hola!")),
+                 TypeError);
+}
+
+// This test verifies that boolean value can be extracted.
+TEST(ElementValue, boolValue) {
+    EXPECT_TRUE(ElementValue<bool>()(Element::create(true)));
+    EXPECT_THROW(ElementValue<bool>()(Element::create("hola!")),
+                 TypeError);
+}
+
+// This test verifies that string value can be extracted.
+TEST(ElementValue, stringValue) {
+    EXPECT_EQ("hola!", ElementValue<std::string>()(Element::create("hola!")));
+    EXPECT_THROW(ElementValue<std::string>()(Element::create(false)),
+                 TypeError);
+}
+
+}
diff --git a/src/lib/cc/tests/json_feed_unittests.cc b/src/lib/cc/tests/json_feed_unittests.cc
new file mode 100644
index 0000000..747d142
--- /dev/null
+++ b/src/lib/cc/tests/json_feed_unittests.cc
@@ -0,0 +1,453 @@
+// Copyright (C) 2017-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/data.h>
+#include <cc/json_feed.h>
+#include <gtest/gtest.h>
+#include <sstream>
+#include <string>
+
+using namespace isc::config;
+using namespace isc::data;
+
+namespace {
+
+/// @brief Test fixture class for @ref JSONFeed class.
+class JSONFeedTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    ///
+    /// Initializes @ref json_map_ and @ref json_list_ which hold reference
+    /// JSON structures.
+    JSONFeedTest()
+        : json_map_(), json_list_() {
+        ElementPtr m = Element::fromJSON(createJSON());
+        ElementPtr l = Element::createList();
+        l->add(m);
+        json_map_ = m;
+        json_list_ = l;
+    }
+
+    /// @brief Creates a JSON map holding 20 elements.
+    ///
+    /// Each map value is a list of 20 elements.
+    std::string createJSON() const {
+        // Create a list of 20 elements.
+        ElementPtr list_element = Element::createList();
+        for (unsigned i = 0; i < 20; ++i) {
+            std::ostringstream s;
+            s << "list_element" << i;
+            list_element->add(Element::create(s.str()));
+        }
+
+        // Create a map of 20 elements. Each map element holds a list
+        // of 20 elements.
+        ElementPtr map_element = Element::createMap();
+        for (unsigned i = 0; i < 20; ++i) {
+            std::ostringstream s;
+            s << "map_element" << i;
+            map_element->set(s.str(), list_element);
+        }
+
+        return (prettyPrint(map_element));
+    }
+
+    /// @brief Test that the JSONFeed correctly recognizes the beginning
+    /// and the end of the JSON structure.
+    ///
+    /// @param input_json A string holding an input JSON structure.
+    /// @param expected_output A structure holding expected output from the
+    /// @ref JSONFeed::toElement.
+    void testRead(const std::string& input_json,
+                  const ConstElementPtr& expected_output) {
+        JSONFeed feed;
+        ASSERT_NO_THROW(feed.initModel());
+
+        // Post the data into the feed in 10 bytes long chunks.
+        size_t chunk = 10;
+
+        for (size_t i = 0; i < input_json.size(); i += chunk) {
+            bool done = false;
+            // When we're near the end of the data stream, the chunk length may
+            // vary.
+            if (i + chunk >= input_json.size()) {
+                chunk = input_json.size() - i;
+                done = true;
+            }
+            // Feed the parser with a data chunk and parse it.
+            feed.postBuffer(&input_json[i], chunk);
+            feed.poll();
+            if (!done) {
+                ASSERT_TRUE(feed.needData());
+            }
+        }
+
+        // Convert parsed/collected data in the feed into the structure of
+        // elements.
+        ConstElementPtr element_from_feed = feed.toElement();
+        EXPECT_TRUE(element_from_feed->equals(*expected_output));
+    }
+
+    /// @brief Test that the JSONFeed correctly recognizes the beginning
+    /// and the end of the JSON structure.
+    ///
+    /// @param input_json A string holding an input JSON structure.
+    /// @param expected_output A string holding expected output from the
+    /// @ref JSONFeed::getProcessedText.
+    void testRead(const std::string& input_json,
+                  const std::string& expected_output) {
+        JSONFeed feed;
+        ASSERT_NO_THROW(feed.initModel());
+
+        // Post the data into the feed in 10 bytes long chunks.
+        size_t chunk = 10;
+
+        for (size_t i = 0; i < input_json.size(); i += chunk) {
+            bool done = false;
+            // When we're near the end of the data stream, the chunk length may
+            // vary.
+            if (i + chunk >= input_json.size()) {
+                chunk = input_json.size() - i;
+                done = true;
+            }
+            // Feed the parser with a data chunk and parse it.
+            feed.postBuffer(&input_json[i], chunk);
+            feed.poll();
+            if (!done) {
+                ASSERT_TRUE(feed.needData());
+            }
+        }
+
+        EXPECT_EQ(expected_output, feed.getProcessedText());
+    }
+
+    /// @brief Test that the @ref JSONFeed signals an error when the input
+    /// string holds invalid data.
+    ///
+    /// @param input_json A string holding an input JSON structure.
+    /// @param err_msg A string holding an expected error message.
+    void testInvalidRead(const std::string& input_json,
+                         const std::string& err_msg) {
+        JSONFeed feed;
+        ASSERT_NO_THROW(feed.initModel());
+
+        ASSERT_NO_THROW(feed.postBuffer(&input_json[0], input_json.size()));
+        ASSERT_NO_THROW(feed.poll());
+
+        EXPECT_FALSE(feed.needData());
+        EXPECT_FALSE(feed.feedOk());
+
+        EXPECT_EQ(err_msg, feed.getErrorMessage());
+    }
+
+    /// @brief JSON map holding a number of lists.
+    ConstElementPtr json_map_;
+
+    /// @brief JSON list holding a map of lists.
+    ConstElementPtr json_list_;
+
+};
+
+// This test verifies that toElement should not be called before
+// the feed detects the end of the data stream.
+TEST_F(JSONFeedTest, toElementTooSoon) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{\n";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_TRUE(feed.needData());
+    EXPECT_THROW(feed.toElement(), JSONFeedError);
+}
+
+// This test verifies that toElement checks JSON syntax as a side effect.
+TEST_F(JSONFeedTest, badJSON) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{\n]\n";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_THROW(feed.toElement(), JSONFeedError);
+}
+
+// This test verifies that a JSON structure starting with '{' is accepted
+// and parsed.
+TEST_F(JSONFeedTest, startWithBrace) {
+    std::string json = createJSON();
+    testRead(json, json_map_);
+}
+
+// This test verifies that a JSON structure starting with '[' is accepted
+// and parsed.
+TEST_F(JSONFeedTest, startWithSquareBracket) {
+    std::string json = createJSON();
+    json = std::string("[") + json + std::string("]");
+    testRead(json, json_list_);
+}
+
+// This test verifies that input JSON can be preceded with whitespaces.
+TEST_F(JSONFeedTest, startWithWhitespace) {
+    std::string json = createJSON();
+    json = std::string("  \r\r\t  ") + json;
+    testRead(json, json_map_);
+}
+
+// This test verifies that an empty map is accepted and parsed.
+TEST_F(JSONFeedTest, emptyMap) {
+    std::string json = "{}";
+    testRead(json, Element::createMap());
+}
+
+// This test verifies that an empty list is accepted and parsed.
+TEST_F(JSONFeedTest, emptyList) {
+    std::string json = "[  ]";
+    testRead(json, Element::createList());
+}
+
+// This test verifies that an error is signalled when a JSON structure
+// is preceded by invalid character.
+TEST_F(JSONFeedTest, unexpectedFirstCharacter) {
+    std::string json = "a {}";
+    std::string err_msg = "invalid first character a";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that an error is signalled when a JSON structure
+// is preceded by white spaces and an invalid character.
+TEST_F(JSONFeedTest, unexpectedCharacter) {
+    std::string json = " a {}";
+    std::string err_msg = "invalid character a";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that an error is signalled when the JSON structure
+// begins by a string.
+TEST_F(JSONFeedTest, stringFirst) {
+    std::string json = "\"foo\"";
+    std::string err_msg = "invalid first character \"";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that an error is signalled when the JSON structure
+// begins by white spaces followed by a string.
+TEST_F(JSONFeedTest, stringBefore) {
+    std::string json = " \"foo\"";
+    std::string err_msg = "invalid character \"";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that an error is signalled when a JSON structure
+// lacks an opening brace character.
+TEST_F(JSONFeedTest, noOpeningBrace) {
+    std::string json = "\"x\": \"y\" }";
+    std::string err_msg = "invalid first character \"";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that an error is signalled when a JSON structure
+// lacks an opening square bracket.
+TEST_F(JSONFeedTest, noOpeningSquareBracket) {
+    std::string json = "1, 2 ]";
+    std::string err_msg = "invalid first character 1";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that a string is correctly handled
+TEST_F(JSONFeedTest, string) {
+    std::string json = "{ \"braces\": \"}}}}\" }";
+    ElementPtr expected = Element::createMap();
+    expected->set("braces", Element::create("}}}}"));
+    testRead(json, expected);
+}
+
+// This test verifies that a string with escapes is correctly handled
+TEST_F(JSONFeedTest, escape) {
+    std::string json = "{ \"escapes\": \"\\n\\t\\\"\\\\\" }";
+    ElementPtr expected = Element::createMap();
+    expected->set("escapes", Element::create("\n\t\"\\"));
+    testRead(json, expected);
+}
+
+// This test verifies that white spaces before JSON are ignored.
+TEST_F(JSONFeedTest, whiteSpaceBefore) {
+    std::string json = " \n  [ ]\n";
+    std::string expected = "[ ]";
+    testRead(json, expected);
+}
+
+// This test verifies that bash style comments before JSON are ignored.
+TEST_F(JSONFeedTest, bashCommentBefore) {
+    std::string json = "# ahah\n  # foo\"bar\n{ }\n";
+    std::string expected = "{ }";
+    testRead(json, expected);
+}
+
+// This test verifies that C++ style comments before JSON are ignored.
+TEST_F(JSONFeedTest, cppCommentBefore) {
+    std::string json = "// ahah\n  // foo\"bar\n[ 12 ]\n";
+    std::string expected = "[ 12 ]";
+    testRead(json, expected);
+}
+
+// This test verifies that multi-line comments before JSON are ignored.
+TEST_F(JSONFeedTest, multiLineCommentBefore) {
+    std::string json = "/* ahah\n \"// foo*bar**/\n { \"foo\": \"bar\" }\n";
+    std::string expected = "{ \"foo\": \"bar\" }";
+    testRead(json, expected);
+}
+
+// This test verifies that an error is signalled when a slash does not
+// begin a C++ or C style comment before JSON.
+TEST_F(JSONFeedTest, badCommentBefore) {
+    std::string json = "/# foo\n [ ]\n";
+    std::string err_msg = "invalid characters /#";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that bash style comments are ignored.
+TEST_F(JSONFeedTest, bashComments) {
+    std::string json = "{ # ahah\n \"foo\": # value?\n \"bar\" }";
+    std::string expected = "{ \n \"foo\": \n \"bar\" }";
+    testRead(json, expected);
+}
+
+// This test verifies that C++ style comments are ignored.
+TEST_F(JSONFeedTest, cppComments) {
+    std::string json = "[ // ahah\n \"foo\", /// value?\n \"bar\" ]";
+    std::string expected = "[ \n \"foo\", \n \"bar\" ]";
+    testRead(json, expected);
+}
+
+// This test verifies that multi-line comments are ignored.
+TEST_F(JSONFeedTest, multiLineComments) {
+    std::string json = "{ /* ahah\n \"// foo*bar**/\n \"foo\": \"bar\" }\n";
+    std::string expected = "{ \n\n \"foo\": \"bar\" }";
+    testRead(json, expected);
+}
+
+// This test verifies that an error is signalled a slash does not begin
+// a C++ or C style comment.
+TEST_F(JSONFeedTest, badComment) {
+    std::string json = "[ /# foo\n ]\n";
+    std::string err_msg = "invalid characters /#";
+    testInvalidRead(json, err_msg);
+}
+
+// This test verifies that trailing garbage is ignored.
+TEST_F(JSONFeedTest, trailing) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "[ 1, 2] 3, 4]";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_TRUE(feed.feedOk());
+    std::string expected = "[ 1, 2]";
+    EXPECT_EQ(expected, feed.getProcessedText());
+}
+
+// Example from DHCPv4 unit tests.
+TEST_F(JSONFeedTest, bashComment4) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{ \"Dhcp4\": { \"interfaces-config\": {"
+        "  \"interfaces\": [ \"*\" ]"
+        "},\n"
+        "# this is a comment\n"
+        "\"rebind-timer\": 2000, \n"
+        "# lots of comments here\n"
+        "# and here\n"
+        "\"renew-timer\": 1000, \n"
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\", "
+        "    \"id\": 1, "
+        "    \"interface\": \"eth0\""
+        " } ],"
+        "\"valid-lifetime\": 4000 } }";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_TRUE(feed.feedOk());
+    EXPECT_NO_THROW(feed.toElement());
+}
+
+// Example from DHCPv4 unit tests.
+TEST_F(JSONFeedTest, bashCommentsInline4) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{ \"Dhcp4\": { \"interfaces-config\": {"
+        "  \"interfaces\": [ \"*\" ]"
+        "},\n"
+        "\"rebind-timer\": 2000, # everything after # is ignored\n"
+        "\"renew-timer\": 1000, # this will be ignored, too\n"
+        "\"subnet4\": [ { "
+        "    \"pools\": [ { \"pool\": \"192.0.2.1 - 192.0.2.100\" } ],"
+        "    \"subnet\": \"192.0.2.0/24\", "
+        "    \"id\": 1, "
+        "    \"interface\": \"eth0\""
+        " } ],"
+        "\"valid-lifetime\": 4000 } }";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_TRUE(feed.feedOk());
+    EXPECT_NO_THROW(feed.toElement());
+}
+
+// Example from DHCPv6 unit tests.
+TEST_F(JSONFeedTest, cppComments6) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{ \"Dhcp6\": { \"interfaces-config\": {"
+        "  \"interfaces\": [ \"*\" ]"
+        "},\n"
+        "\"preferred-lifetime\": 3000, // this is a comment \n"
+        "\"rebind-timer\": 2000, // everything after // is ignored\n"
+        "\"renew-timer\": 1000, // this will be ignored, too\n"
+        "\"subnet6\": [ { "
+        "    \"pools\": [ { \"pool\": \"2001:db8:1::/64\" } ],"
+        "    \"subnet\": \"2001:db8:1::/48\", "
+        "    \"id\": 1, "
+        "    \"interface\": \"eth0\""
+        " } ],"
+        "\"valid-lifetime\": 4000 } }";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_TRUE(feed.feedOk());
+    EXPECT_NO_THROW(feed.toElement());
+}
+
+// Example from DHCPv6 unit tests.
+TEST_F(JSONFeedTest, multilineComments6) {
+    JSONFeed feed;
+    ASSERT_NO_THROW(feed.initModel());
+    std::string json = "{ \"Dhcp6\": { \"interfaces-config\": {"
+        "  \"interfaces\": [ \"*\" ]"
+        "},\n"
+        "\"preferred-lifetime\": 3000, /* this is a C style comment\n"
+        "that\n can \n span \n multiple \n lines */ \n"
+        "\"rebind-timer\": 2000,\n"
+        "\"renew-timer\": 1000, \n"
+        "\"subnet6\": [ { "
+        "    \"pools\": [ { \"pool\": \"2001:db8:1::/64\" } ],"
+        "    \"subnet\": \"2001:db8:1::/48\", "
+        "    \"id\": 1, "
+        "    \"interface\": \"eth0\""
+        " } ],"
+        "\"valid-lifetime\": 4000 } }";
+    feed.postBuffer(&json[0], json.size());
+    feed.poll();
+    EXPECT_FALSE(feed.needData());
+    EXPECT_TRUE(feed.feedOk());
+    EXPECT_NO_THROW(feed.toElement());
+}
+
+} // end of anonymous namespace.
diff --git a/src/lib/cc/tests/run_unittests.cc b/src/lib/cc/tests/run_unittests.cc
new file mode 100644
index 0000000..40c051f
--- /dev/null
+++ b/src/lib/cc/tests/run_unittests.cc
@@ -0,0 +1,20 @@
+// Copyright (C) 2009-2015 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 <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/cc/tests/server_tag_unittest.cc b/src/lib/cc/tests/server_tag_unittest.cc
new file mode 100644
index 0000000..523be74
--- /dev/null
+++ b/src/lib/cc/tests/server_tag_unittest.cc
@@ -0,0 +1,97 @@
+// Copyright (C) 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 <cc/server_tag.h>
+#include <exceptions/exceptions.h>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+#include <string>
+
+using namespace isc;
+using namespace isc::data;
+
+namespace {
+
+// This test verifies that the constructors of the ServerTag class
+// work properly.
+TEST(ServerTagTest, constructors) {
+    boost::scoped_ptr<ServerTag> tag;
+
+    {
+        SCOPED_TRACE("default constructor for all servers");
+        ASSERT_NO_THROW(tag.reset(new ServerTag()));
+        EXPECT_EQ(ServerTag::ALL, tag->get());
+        EXPECT_TRUE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("all servers");
+        ASSERT_NO_THROW(tag.reset(new ServerTag(ServerTag::ALL)));
+        EXPECT_EQ(ServerTag::ALL, tag->get());
+        EXPECT_TRUE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("no whitespace");
+        ASSERT_NO_THROW(tag.reset(new ServerTag("xyz")));
+        EXPECT_EQ("xyz", tag->get());
+        EXPECT_FALSE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("leading whitespace");
+        ASSERT_NO_THROW(tag.reset(new ServerTag("  left")));
+        EXPECT_EQ("left", tag->get());
+        EXPECT_FALSE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("terminating whitespace");
+        ASSERT_NO_THROW(tag.reset(new ServerTag("right  ")));
+        EXPECT_EQ("right", tag->get());
+        EXPECT_FALSE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("leading and terminating whitespace");
+        ASSERT_NO_THROW(tag.reset(new ServerTag("  both left-right  ")));
+        EXPECT_EQ("both left-right", tag->get());
+        EXPECT_FALSE(tag->amAll());
+    }
+
+    {
+        SCOPED_TRACE("upper to lower case");
+        ASSERT_NO_THROW(tag.reset(new ServerTag("UPPER CASE TAG")));
+        EXPECT_EQ("upper case tag", tag->get());
+        EXPECT_FALSE(tag->amAll());
+    }
+}
+
+// This test verifies that malformed server tags are rejected.
+TEST(ServerTagTest, malformed) {
+    {
+        SCOPED_TRACE("empty tag");
+        EXPECT_THROW(ServerTag(""), BadValue);
+    }
+
+    {
+        SCOPED_TRACE("only whitespaces");
+        EXPECT_THROW(ServerTag("   "), BadValue);
+    }
+
+    {
+        SCOPED_TRACE("too long tag, max is 256");
+        EXPECT_THROW(ServerTag(std::string(257, 'c')), BadValue);
+    }
+
+    {
+        SCOPED_TRACE("use reserved keyword any as a tag");
+        EXPECT_THROW(ServerTag("any"), BadValue);
+    }
+}
+
+}
diff --git a/src/lib/cc/tests/simple_parser_unittest.cc b/src/lib/cc/tests/simple_parser_unittest.cc
new file mode 100644
index 0000000..76e5ffc
--- /dev/null
+++ b/src/lib/cc/tests/simple_parser_unittest.cc
@@ -0,0 +1,364 @@
+// Copyright (C) 2016-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <stdint.h>
+#include <cc/simple_parser.h>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::data;
+using namespace isc::asiolink;
+using isc::dhcp::DhcpConfigError;
+
+/// This list defines required keywords.
+const SimpleRequiredKeywords REQUIRED_KEYWORDS = { "foobar" };
+
+/// This table defines keywords and types.
+const SimpleKeywords KEYWORDS = {
+    { "id",     Element::integer },
+    { "prefix", Element::string },
+    { "map",    Element::map },
+    { "any",    Element::any }
+};
+
+/// This table defines sample default values. Although these are DHCPv6
+/// specific, the mechanism is generic and can be used by any other component.
+const SimpleDefaults SAMPLE_DEFAULTS = {
+    { "renew-timer",        Element::integer, "900" },
+    { "rebind-timer",       Element::integer, "1800" },
+    { "preferred-lifetime", Element::integer, "3600" },
+    { "valid-lifetime",     Element::integer, "7200" }
+};
+
+/// This list defines parameters that can be inherited from one scope
+/// to another. Although these are DHCPv6 specific, the mechanism is generic and
+/// can be used by any other component.
+const ParamsList SAMPLE_INHERITS = {
+    "renew-timer",
+    "rebind-timer",
+    "preferred-lifetime",
+    "valid-lifetime"
+};
+
+/// @brief Simple Parser test fixture class
+class SimpleParserTest : public ::testing::Test {
+public:
+    /// @brief Checks if specified map has an integer parameter with expected value
+    ///
+    /// @param map map to be checked
+    /// @param param_name name of the parameter to be checked
+    /// @param exp_value expected value of the parameter.
+    void checkIntegerValue(const ConstElementPtr& map, const std::string& param_name,
+                           int64_t exp_value) {
+
+        // First check if the passed element is a map.
+        ASSERT_EQ(Element::map, map->getType());
+
+        // Now try to get the element being checked
+        ConstElementPtr elem = map->get(param_name);
+        ASSERT_TRUE(elem);
+
+        // Now check if it's indeed integer
+        ASSERT_EQ(Element::integer, elem->getType());
+
+        // Finally, check if its value meets expectation.
+        EXPECT_EQ(exp_value, elem->intValue());
+    }
+};
+
+class SimpleParserClassTest : public SimpleParser {
+public:
+    /// @brief Instantiation of getAndConvert
+    ///
+    /// @param scope specified parameter will be extracted from this scope
+    /// @param name name of the parameter for error report
+    /// @return a bool value
+    bool getAsBool(ConstElementPtr scope, const std::string& name) {
+        return (getAndConvert<bool, toBool>(scope, name, "boolean"));
+    }
+
+    /// @brief Convert to boolean
+    ///
+    /// @param str the string "false" or "true"
+    /// @return false for "false" and true for "true"
+    /// @thrown isc::OutOfRange if not "false" or "true'
+    static bool toBool(const std::string& str) {
+        if (str == "false") {
+            return (false);
+        } else if (str == "true") {
+            return (true);
+        } else {
+            isc_throw(TypeError, "not a boolean: " << str);
+        }
+    }
+};
+
+// This test checks if the checkRequired method works as expected.
+TEST_F(SimpleParserTest, checkRequired) {
+    ConstElementPtr empty = Element::fromJSON("{ }");
+    EXPECT_THROW(SimpleParser::checkRequired(REQUIRED_KEYWORDS, empty),
+                 DhcpConfigError);
+    ConstElementPtr other = Element::fromJSON("{ \"foo\": 1, \"bar\": 2 }");
+    EXPECT_THROW(SimpleParser::checkRequired(REQUIRED_KEYWORDS, other),
+                 DhcpConfigError);
+    ConstElementPtr good = Element::fromJSON("{ \"foobar\": 2 }");
+    EXPECT_NO_THROW(SimpleParser::checkRequired(REQUIRED_KEYWORDS, good));
+}
+
+// This test checks if the checkKeywords method works as expected.
+TEST_F(SimpleParserTest, checkKeywords) {
+    ConstElementPtr empty = Element::fromJSON("{ }");
+    EXPECT_NO_THROW(SimpleParser::checkKeywords(KEYWORDS, empty));
+    ConstElementPtr id = Element::fromJSON("{ \"id\": 1 }");
+    EXPECT_NO_THROW(SimpleParser::checkKeywords(KEYWORDS, id));
+    ConstElementPtr any = Element::fromJSON("{ \"any\": 1 }");
+    EXPECT_NO_THROW(SimpleParser::checkKeywords(KEYWORDS, any));
+    ConstElementPtr bad_id = Element::fromJSON("{ \"id\": true }");
+    EXPECT_THROW(SimpleParser::checkKeywords(KEYWORDS, bad_id),
+                 DhcpConfigError);
+    ConstElementPtr bad_prefix = Element::fromJSON("{ \"prefix\": 12 }");
+    EXPECT_THROW(SimpleParser::checkKeywords(KEYWORDS, bad_prefix),
+                 DhcpConfigError);
+    ConstElementPtr bad_map = Element::fromJSON("{ \"map\": [ ] }");
+    EXPECT_THROW(SimpleParser::checkKeywords(KEYWORDS, bad_map),
+                 DhcpConfigError);
+    ConstElementPtr spurious = Element::fromJSON("{ \"spurious\": 1 }");
+    EXPECT_THROW(SimpleParser::checkKeywords(KEYWORDS, spurious),
+                 DhcpConfigError);
+
+    // Bad type has precedence.
+    ConstElementPtr bad = Element::fromJSON("{ \"spurious\": 1, \"id\": true }");
+    try {
+        SimpleParser::checkKeywords(KEYWORDS, bad);
+        ADD_FAILURE() << "expect exception";
+    } catch (const DhcpConfigError& ex) {
+        EXPECT_EQ("'id' parameter is not an integer", std::string(ex.what()));
+    } catch (...) {
+        ADD_FAILURE() << "expect DhcpConfigError";
+    }
+}
+
+// This test checks if the parameters can be inherited from the global
+// scope to the subnet scope.
+TEST_F(SimpleParserTest, deriveParams) {
+    ElementPtr global = Element::fromJSON("{ \"renew-timer\": 1,"
+                                          "  \"rebind-timer\": 2,"
+                                          "  \"preferred-lifetime\": 3,"
+                                          "  \"valid-lifetime\": 4"
+                                          "}");
+    ElementPtr subnet = Element::fromJSON("{ \"renew-timer\": 100 }");
+
+    // we should inherit 3 parameters. Renew-timer should remain intact,
+    // as it was already defined in the subnet scope.
+    size_t num;
+    EXPECT_NO_THROW(num = SimpleParser::deriveParams(global, subnet,
+                                                     SAMPLE_INHERITS));
+    EXPECT_EQ(3, num);
+
+    // Check the values. 3 of them are inherited, while the fourth one
+    // was already defined in the subnet, so should not be inherited.
+    checkIntegerValue(subnet, "renew-timer", 100);
+    checkIntegerValue(subnet, "rebind-timer", 2);
+    checkIntegerValue(subnet, "preferred-lifetime", 3);
+    checkIntegerValue(subnet, "valid-lifetime", 4);
+}
+
+// This test checks if global defaults are properly set for DHCPv6.
+TEST_F(SimpleParserTest, setDefaults) {
+
+    ElementPtr empty = Element::fromJSON("{ }");
+    size_t num = 0;
+
+    EXPECT_NO_THROW(num = SimpleParser::setDefaults(empty, SAMPLE_DEFAULTS));
+
+    // We expect at least 4 parameters to be inserted.
+    EXPECT_GE(num, 3);
+
+    checkIntegerValue(empty, "valid-lifetime", 7200);
+    checkIntegerValue(empty, "preferred-lifetime", 3600);
+    checkIntegerValue(empty, "rebind-timer", 1800);
+    checkIntegerValue(empty, "renew-timer", 900);
+}
+
+// This test checks if global defaults are properly set for DHCPv6.
+TEST_F(SimpleParserTest, setListDefaults) {
+
+    ElementPtr empty = Element::fromJSON("[{}, {}, {}]");
+    size_t num;
+
+    EXPECT_NO_THROW(num = SimpleParser::setListDefaults(empty, SAMPLE_DEFAULTS));
+
+    // We expect at least 12 parameters to be inserted (3 entries, with
+    // 4 parameters inserted in each)
+    EXPECT_EQ(12, num);
+
+    ASSERT_EQ(Element::list, empty->getType());
+    ASSERT_EQ(3, empty->size());
+
+    ConstElementPtr first = empty->get(0);
+    ConstElementPtr second = empty->get(1);
+    ConstElementPtr third = empty->get(2);
+
+    checkIntegerValue(first, "valid-lifetime", 7200);
+    checkIntegerValue(first, "preferred-lifetime", 3600);
+    checkIntegerValue(first, "rebind-timer", 1800);
+    checkIntegerValue(first, "renew-timer", 900);
+
+    checkIntegerValue(second, "valid-lifetime", 7200);
+    checkIntegerValue(second, "preferred-lifetime", 3600);
+    checkIntegerValue(second, "rebind-timer", 1800);
+    checkIntegerValue(second, "renew-timer", 900);
+
+    checkIntegerValue(third, "valid-lifetime", 7200);
+    checkIntegerValue(third, "preferred-lifetime", 3600);
+    checkIntegerValue(third, "rebind-timer", 1800);
+    checkIntegerValue(third, "renew-timer", 900);
+}
+
+// This test exercises the getIntType template
+TEST_F(SimpleParserTest, getIntType) {
+
+    SimpleParserClassTest parser;
+
+    // getIntType checks it can be found
+    ElementPtr not_found = Element::fromJSON("{ \"bar\": 1 }");
+    EXPECT_THROW(parser.getUint8(not_found, "foo"), DhcpConfigError);
+
+    // getIntType checks if it is an integer
+    ElementPtr not_int = Element::fromJSON("{ \"foo\": \"xyz\" }");
+    EXPECT_THROW(parser.getUint8(not_int, "foo"), DhcpConfigError);
+
+    // getIntType checks bounds
+    ElementPtr negative = Element::fromJSON("{ \"foo\": -1 }");
+    EXPECT_THROW(parser.getUint8(negative, "foo"), DhcpConfigError);
+    ElementPtr too_large = Element::fromJSON("{ \"foo\": 1024 }");
+    EXPECT_THROW(parser.getUint8(too_large, "foo"), DhcpConfigError);
+
+    // checks if getIntType can return the expected value
+    ElementPtr hundred = Element::fromJSON("{ \"foo\": 100 }");
+    uint8_t val = 0;
+    EXPECT_NO_THROW(val = parser.getUint8(hundred, "foo"));
+    EXPECT_EQ(100, val);
+}
+
+// This test exercises the getInteger with range checking
+TEST_F(SimpleParserTest, getInteger) {
+
+    // The value specified is 100.
+    ElementPtr json = Element::fromJSON("{ \"bar\": 100 }");
+    int64_t x = -1;
+
+    // Positive case: we expect value in range 0..200. All ok.
+    EXPECT_NO_THROW(x = SimpleParser::getInteger(json, "bar", 0, 200));
+    EXPECT_EQ(100, x);
+
+    // Border checks: 100 for 100..200 range is still ok.
+    EXPECT_NO_THROW(x = SimpleParser::getInteger(json, "bar", 100, 200));
+    // Border checks: 100 for 1..100 range is still ok.
+    EXPECT_NO_THROW(x = SimpleParser::getInteger(json, "bar", 1, 100));
+
+    // Out of expected range. Should throw.
+    EXPECT_THROW(x = SimpleParser::getInteger(json, "bar", 101, 200), OutOfRange);
+    EXPECT_THROW(x = SimpleParser::getInteger(json, "bar", 1, 99), OutOfRange);
+}
+
+// This test exercises the getAndConvert template
+TEST_F(SimpleParserTest, getAndConvert) {
+
+    SimpleParserClassTest parser;
+
+    // getAndConvert checks it can be found
+    ElementPtr not_found = Element::fromJSON("{ \"bar\": \"true\" }");
+    EXPECT_THROW(parser.getAsBool(not_found, "foo"), DhcpConfigError);
+
+    // getAndConvert checks if it is a string
+    ElementPtr not_bool = Element::fromJSON("{ \"foo\": 1 }");
+    EXPECT_THROW(parser.getAsBool(not_bool, "foo"), DhcpConfigError);
+
+    // checks if getAndConvert can return the expected value
+    ElementPtr a_bool = Element::fromJSON("{ \"foo\": \"false\" }");
+    bool val = true;
+    EXPECT_NO_THROW(val = parser.getAsBool(a_bool, "foo"));
+    EXPECT_FALSE(val);
+
+    // getAndConvert checks conversion
+    ElementPtr bad_bool = Element::fromJSON("{ \"foo\": \"bar\" }");
+    EXPECT_THROW(parser.getAsBool(bad_bool, "bar"), DhcpConfigError);
+}
+
+// This test exercises the getIOAddress
+TEST_F(SimpleParserTest, getIOAddress) {
+
+    SimpleParserClassTest parser;
+
+    // getAddress checks it can be found
+    ElementPtr not_found = Element::fromJSON("{ \"bar\": 1 }");
+    EXPECT_THROW(parser.getAddress(not_found, "foo"), DhcpConfigError);
+
+    // getAddress checks if it is a string
+    ElementPtr not_addr = Element::fromJSON("{ \"foo\": 1234 }");
+    EXPECT_THROW(parser.getAddress(not_addr, "foo"), DhcpConfigError);
+
+    // checks if getAddress can return the expected value of v4 address
+    ElementPtr v4 = Element::fromJSON("{ \"foo\": \"192.0.2.1\" }");
+    IOAddress val("::");
+    EXPECT_NO_THROW(val = parser.getAddress(v4, "foo"));
+    EXPECT_EQ("192.0.2.1" , val.toText());
+
+    // checks if getAddress can return the expected value of v4 address
+    ElementPtr v6 = Element::fromJSON("{ \"foo\": \"2001:db8::1\" }");
+    EXPECT_NO_THROW(val = parser.getAddress(v6, "foo"));
+    EXPECT_EQ("2001:db8::1" , val.toText());
+}
+
+// This test exercises getDouble()
+TEST_F(SimpleParserTest, getDouble) {
+
+    SimpleParserClassTest parser;
+    std::string json =
+    "{\n"
+    "  \"string\" : \"12.3\",\n"
+    "  \"bool\" : true, \n"
+    "  \"int\" : 777, \n"
+    "  \"map\" : {}, \n"
+    "  \"list\" : [], \n"
+    "  \"zero\" : 0.0, \n"
+    "  \"fraction\" : .75, \n"
+    "  \"negative\" : -1.45, \n"
+    "  \"positive\" : 346.7 \n"
+    "}\n";
+
+    // Create our test set of parameters.
+    ElementPtr elems;
+    ASSERT_NO_THROW(elems = Element::fromJSON(json)) << " invalid JSON, test is broken";
+
+    // Verify that a non-existant element is caught.
+    EXPECT_THROW(parser.getDouble(elems, "not-there"), DhcpConfigError);
+
+    // Verify that wrong element types are caught.
+    EXPECT_THROW(parser.getDouble(elems, "string"), DhcpConfigError);
+    EXPECT_THROW(parser.getDouble(elems, "int"), DhcpConfigError);
+    EXPECT_THROW(parser.getDouble(elems, "bool"), DhcpConfigError);
+    EXPECT_THROW(parser.getDouble(elems, "map"), DhcpConfigError);
+    EXPECT_THROW(parser.getDouble(elems, "list"), DhcpConfigError);
+
+    // Verify valid values are correct.
+    double value;
+
+    EXPECT_NO_THROW(value = parser.getDouble(elems, "zero"));
+    EXPECT_EQ(0.0, value);
+
+    EXPECT_NO_THROW(value = parser.getDouble(elems, "fraction"));
+    EXPECT_EQ(.75, value);
+
+    EXPECT_NO_THROW(value = parser.getDouble(elems, "negative"));
+    EXPECT_EQ(-1.45, value);
+
+    EXPECT_NO_THROW(value = parser.getDouble(elems, "positive"));
+    EXPECT_EQ(346.7, value);
+}
diff --git a/src/lib/cc/tests/stamped_element_unittest.cc b/src/lib/cc/tests/stamped_element_unittest.cc
new file mode 100644
index 0000000..1ffcd84
--- /dev/null
+++ b/src/lib/cc/tests/stamped_element_unittest.cc
@@ -0,0 +1,132 @@
+// Copyright (C) 2018-2019 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 <cc/stamped_element.h>
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+
+namespace {
+
+// Tests that the modification timestamp is by default set to current
+// time and the identifier is set to 0.
+TEST(StampedElementTest, create) {
+    StampedElement element;
+
+    // Default identifier is 0.
+    EXPECT_EQ(0, element.getId());
+
+    // By default there is no server tag.
+    EXPECT_TRUE(element.getServerTags().empty());
+
+    // Checking that the delta between now and the timestamp is within
+    // 5s range should be sufficient.
+    boost::posix_time::time_duration delta =
+        boost::posix_time::second_clock::local_time() -
+        element.getModificationTime();
+    EXPECT_LT(delta.seconds(), 5);
+}
+
+// Tests that default id can be overridden by a new value.
+TEST(StampedElementTest, setId) {
+    StampedElement element;
+    element.setId(123);
+    EXPECT_EQ(123, element.getId());
+}
+
+// Tests that the modification timestamp can be set to an arbitrary
+// value.
+TEST(StampedElementTest, setModificationTime) {
+    boost::posix_time::ptime
+        modification_time(boost::gregorian::date(2002, boost::date_time::Jan, 10),
+                          boost::posix_time::time_duration(1,2,3));
+    StampedElement element;
+    element.setModificationTime(modification_time);
+    EXPECT_TRUE(element.getModificationTime() == modification_time);
+}
+
+// Tests that updating modification timestamp sets it to the current
+// time.
+TEST(StampedElementTest, update) {
+    boost::posix_time::ptime
+        modification_time(boost::gregorian::date(2002, boost::date_time::Jan, 10),
+                          boost::posix_time::time_duration(1,2,3));
+    StampedElement element;
+    element.setModificationTime(modification_time);
+    element.updateModificationTime();
+
+    // Checking that the delta between now and the timestamp is within
+    // 5s range should be sufficient.
+    boost::posix_time::time_duration delta =
+        boost::posix_time::second_clock::local_time() -
+        element.getModificationTime();
+    EXPECT_LT(delta.seconds(), 5);
+}
+
+// Tests that one or more server tag can be specified.
+TEST(StampedElementTest, setServerTag) {
+    StampedElement element;
+    element.setServerTag("foo");
+    EXPECT_EQ(1, element.getServerTags().size());
+    EXPECT_EQ("foo", element.getServerTags().begin()->get());
+
+    element.setServerTag("bar");
+    EXPECT_EQ(2, element.getServerTags().size());
+
+    EXPECT_TRUE(element.hasServerTag(ServerTag("foo")));
+    EXPECT_TRUE(element.hasServerTag(ServerTag("bar")));
+    EXPECT_FALSE(element.hasServerTag(ServerTag("xyz")));
+    EXPECT_FALSE(element.hasAllServerTag());
+
+    element.setServerTag(ServerTag::ALL);
+    EXPECT_TRUE(element.hasAllServerTag());
+}
+
+// Tests that a server tag can be deleted.
+TEST(StampedElementTest, delServerTag) {
+    StampedElement element;
+    EXPECT_THROW(element.delServerTag("foo"), isc::NotFound);
+    element.setServerTag("foo");
+    element.setServerTag("bar");
+
+    ASSERT_EQ(2, element.getServerTags().size());
+    EXPECT_TRUE(element.hasServerTag(ServerTag("foo")));
+    EXPECT_TRUE(element.hasServerTag(ServerTag("bar")));
+
+    EXPECT_NO_THROW(element.delServerTag("foo"));
+    ASSERT_EQ(1, element.getServerTags().size());
+    EXPECT_TRUE(element.hasServerTag(ServerTag("bar")));
+
+    EXPECT_NO_THROW(element.delServerTag("bar"));
+    EXPECT_EQ(0, element.getServerTags().size());
+    EXPECT_THROW(element.delServerTag("bar"), isc::NotFound);
+}
+
+
+// Test that metadata can be created from the StampedElement.
+TEST(StampedElementTest, getMetadata) {
+    StampedElement element;
+    element.setServerTag("world");
+    auto metadata = element.getMetadata();
+    ASSERT_TRUE(metadata);
+    ASSERT_EQ(Element::map, metadata->getType());
+
+    auto server_tags_element = metadata->get("server-tags");
+    ASSERT_TRUE(server_tags_element);
+    EXPECT_EQ(Element::list, server_tags_element->getType());
+    EXPECT_EQ(1, server_tags_element->size());
+
+    auto server_tag_element = server_tags_element->get(0);
+    ASSERT_TRUE(server_tag_element);
+    EXPECT_EQ(Element::string, server_tag_element->getType());
+    EXPECT_EQ("world", server_tag_element->stringValue());
+}
+
+}
diff --git a/src/lib/cc/tests/stamped_value_unittest.cc b/src/lib/cc/tests/stamped_value_unittest.cc
new file mode 100644
index 0000000..d305a34
--- /dev/null
+++ b/src/lib/cc/tests/stamped_value_unittest.cc
@@ -0,0 +1,175 @@
+// Copyright (C) 2018-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/stamped_value.h>
+#include <exceptions/exceptions.h>
+#include <boost/scoped_ptr.hpp>
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::data;
+
+namespace {
+
+// Tests that the stamped value can be created with a NULL value.
+TEST(StampedValueTest, createNull) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar"));
+
+    EXPECT_TRUE(value->amNull());
+
+    EXPECT_THROW(value->getType(), InvalidOperation);
+    EXPECT_THROW(value->getValue(), InvalidOperation);
+    EXPECT_THROW(value->getIntegerValue(), InvalidOperation);
+    EXPECT_THROW(value->getBoolValue(), InvalidOperation);
+    EXPECT_THROW(value->getDoubleValue(), InvalidOperation);
+}
+
+// Tests that stamped value from string can be created.
+TEST(StampedValueTest, createFromString) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", Element::create("foo")));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::string, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("foo", value->getValue());
+
+    EXPECT_THROW(value->getIntegerValue(), TypeError);
+    EXPECT_THROW(value->getBoolValue(), TypeError);
+    EXPECT_THROW(value->getDoubleValue(), TypeError);
+}
+
+// Tests that the stamped value can be created from string using the
+// factory function variant that takes parameter type as an argument.
+TEST(StampedValueTest, convertStringToString) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", "foo", Element::string));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::string, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("foo", value->getValue());
+}
+
+// Tests that stamped value from integer can be created.
+TEST(StampedValueTest, createFromInteger) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", Element::create(static_cast<int64_t>(5))));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::integer, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("5", value->getValue());
+    int64_t signed_integer = 0;
+    ASSERT_NO_THROW(signed_integer = value->getIntegerValue());
+    EXPECT_EQ(5, signed_integer);
+
+    EXPECT_THROW(value->getBoolValue(), TypeError);
+    EXPECT_THROW(value->getDoubleValue(), TypeError);
+}
+
+// Tests that stamped value can be converted from string to integer.
+TEST(StampedValueTest, convertStringToInteger) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", "123", Element::integer));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::integer, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ(123, value->getIntegerValue());
+
+    EXPECT_THROW(StampedValue::create("bar", "hoho", Element::integer), BadValue);
+}
+
+// Tests that stamped value from bool can be created.
+TEST(StampedValueTest, createFromBool) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", Element::create(static_cast<bool>(true))));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::boolean, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("1", value->getValue());
+    bool bool_value = false;
+    ASSERT_NO_THROW(bool_value = value->getBoolValue());
+    EXPECT_TRUE(bool_value);
+
+    EXPECT_THROW(value->getIntegerValue(), TypeError);
+    EXPECT_THROW(value->getDoubleValue(), TypeError);
+}
+
+// Tests that stamped value can be converted from string to boolean.
+TEST(StampedValueTest, convertStringToBoolean) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", "1", Element::boolean));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::boolean, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_TRUE(value->getBoolValue());
+
+    ASSERT_NO_THROW(value = StampedValue::create("foo", "0", Element::boolean));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::boolean, value->getType());
+    EXPECT_EQ("foo", value->getName());
+    EXPECT_FALSE(value->getBoolValue());
+
+    EXPECT_THROW(StampedValue::create("bar", "888", Element::boolean), BadValue);
+}
+
+// Tests that stamped value from real can be created.
+TEST(StampedValueTest, createFromDouble) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", Element::create(static_cast<double>(1.45))));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::real, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("1.45", value->getValue());
+    double double_value = 0;
+    ASSERT_NO_THROW(double_value = value->getDoubleValue());
+    EXPECT_EQ(1.45, double_value);
+
+    EXPECT_THROW(value->getIntegerValue(), TypeError);
+    EXPECT_THROW(value->getBoolValue(), TypeError);
+}
+
+// Tests that stamped value from real can handle a round value.
+TEST(StampedValueTest, createFromDoubleRound) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", Element::create(static_cast<double>(7.0))));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::real, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ("7.0", value->getValue());
+    double double_value = 0;
+    ASSERT_NO_THROW(double_value = value->getDoubleValue());
+    EXPECT_EQ(7.0, double_value);
+
+    EXPECT_THROW(value->getIntegerValue(), TypeError);
+    EXPECT_THROW(value->getBoolValue(), TypeError);
+}
+
+// Tests that stamped value can be converted from string to real.
+TEST(StampedValueTest, convertStringToDouble) {
+    StampedValuePtr value;
+    ASSERT_NO_THROW(value = StampedValue::create("bar", "1.67", Element::real));
+    EXPECT_FALSE(value->amNull());
+    EXPECT_EQ(Element::real, value->getType());
+    EXPECT_EQ("bar", value->getName());
+    EXPECT_EQ(1.67, value->getDoubleValue());
+
+    EXPECT_THROW(StampedValue::create("bar", "hoho", Element::real), BadValue);
+}
+
+// Tests that the value must have an allowed type.
+TEST(StampedValueTest, createFailures) {
+    EXPECT_THROW(StampedValue::create("bar", ElementPtr()), BadValue);
+    EXPECT_THROW(StampedValue::create("bar", Element::createMap()), TypeError);
+    EXPECT_THROW(StampedValue::create("bar", Element::createList()), TypeError);
+
+    EXPECT_THROW(StampedValue::create("bar", "1", Element::map), TypeError);
+    EXPECT_THROW(StampedValue::create("bar", "1", Element::list), TypeError);
+    EXPECT_THROW(StampedValue::create("bar", "1", Element::null), TypeError);
+}
+
+}
diff --git a/src/lib/cc/tests/user_context_unittests.cc b/src/lib/cc/tests/user_context_unittests.cc
new file mode 100644
index 0000000..e88b421
--- /dev/null
+++ b/src/lib/cc/tests/user_context_unittests.cc
@@ -0,0 +1,132 @@
+// Copyright (C) 2018-2020 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 <cc/user_context.h>
+#include <gtest/gtest.h>
+
+using namespace isc::data;
+
+namespace {
+
+ElementPtr gen() {
+    std::string content = "{ \"foo\": 1, \"bar\": \"xyz\" }";
+    return (Element::fromJSON(content));
+}
+
+TEST(UserContext, setget) {
+    UserContext parent;
+    EXPECT_FALSE(parent.getContext());
+    ConstElementPtr map = gen();
+    parent.setContext(map);
+    ConstElementPtr ctx = parent.getContext();
+    EXPECT_EQ(*ctx, *map);
+}
+
+TEST(UserContext, null) {
+    UserContext parent;
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    EXPECT_EQ(*expected, *map);
+}
+
+TEST(UserContext, notMap) {
+    UserContext parent;
+    ConstElementPtr ctx = Element::create("foo");
+    parent.setContext(ctx);
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    expected->set("user-context", ctx);
+    EXPECT_EQ(*expected, *map);
+}
+
+TEST(UserContext, empty) {
+    UserContext parent;
+    ConstElementPtr ctx = Element::createMap();
+    parent.setContext(ctx);
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    expected->set("user-context", ctx);
+    EXPECT_EQ(*expected, *map);
+}
+
+TEST(UserContext, noComment) {
+    UserContext parent;
+    ConstElementPtr ctx = Element::fromJSON("{ \"version\": 1 }");
+    parent.setContext(ctx);
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    expected->set("user-context", ctx);
+    EXPECT_EQ(*expected, *map);
+};
+
+TEST(UserContext, onlyComment) {
+    UserContext parent;
+    ConstElementPtr ctx = Element::fromJSON("{ \"comment\": \"foobar\" }");
+    parent.setContext(ctx);
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    expected->set("user-context", ctx);
+    EXPECT_EQ(*expected, *map);
+}
+
+TEST(UserContext, both) {
+    UserContext parent;
+    ConstElementPtr ctx =
+        Element::fromJSON("{ \"comment\": \"foobar\", \"version\": 1 }");
+    parent.setContext(ctx);
+    ElementPtr map = gen();
+    parent.contextToElement(map);
+    ElementPtr expected = gen();
+    expected->set("user-context", ctx);
+    EXPECT_EQ(*expected, *map);
+}
+
+TEST(toElement, notMap) {
+    ConstElementPtr arg = Element::create("foo");
+    ConstElementPtr result = UserContext::toElement(arg);
+    EXPECT_EQ(*result, *arg);
+}
+
+TEST(toElement, empty) {
+    ElementPtr map = gen();
+    ConstElementPtr ctx = Element::createMap();
+    map->set("user-context", ctx);
+    ConstElementPtr result = UserContext::toElement(map);
+    EXPECT_EQ(*result, *map);
+}
+
+TEST(toElement, noComment) {
+    ElementPtr map = gen();
+    ConstElementPtr ctx = Element::fromJSON("{ \"version\": 1 }");
+    map->set("user-context", ctx);
+    ConstElementPtr result = UserContext::toElement(map);
+    EXPECT_EQ(*result, *map);
+}
+
+TEST(toElement, onlyComment) {
+    ElementPtr map = gen();
+    ConstElementPtr ctx = Element::fromJSON("{ \"comment\": \"foobar\" }");
+    map->set("user-context", ctx);
+    ConstElementPtr result = UserContext::toElement(map);
+    EXPECT_EQ(*result, *map);
+}
+
+TEST(toElement, both) {
+    ElementPtr map = gen();
+    ConstElementPtr ctx =
+        Element::fromJSON("{ \"comment\": \"foobar\", \"version\": 1 }");
+    map->set("user-context", ctx);
+    ConstElementPtr result = UserContext::toElement(map);
+    EXPECT_EQ(*result, *map);
+}
+
+}