26 files changed, 7690 insertions, 0 deletions
diff --git a/src/lib/yang/tests/Makefile.am b/src/lib/yang/tests/Makefile.am
new file mode 100644
index 0000000..028f3d9
--- /dev/null
+++ b/src/lib/yang/tests/Makefile.am
@@ -0,0 +1,70 @@
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+run_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
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+run_unittests_LDADD += $(top_builddir)/src/lib/util/unittests/libutil_unittests.la
+run_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+run_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
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diff --git a/src/lib/yang/tests/Makefile.in b/src/lib/yang/tests/Makefile.in
new file mode 100644
index 0000000..6c5989a
--- /dev/null
+++ b/src/lib/yang/tests/Makefile.in
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+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_class_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_control_socket_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_database_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_logger_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_def_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pd_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_shared_network_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_utils_unittests.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/run_unittests-adaptor_config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_option_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-adaptor_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-config_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_class_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_control_socket_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_database_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_host_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_logger_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_data_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_option_def_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pd_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_pool_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_shared_network_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_subnet_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_unittests.Po
+	-rm -f ./$(DEPDIR)/run_unittests-translator_utils_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/yang/tests/adaptor_config_unittests.cc b/src/lib/yang/tests/adaptor_config_unittests.cc
new file mode 100644
index 0000000..2109890
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_config_unittests.cc
@@ -0,0 +1,154 @@
+// 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 <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <testutils/io_utils.h>
+#include <testutils/user_context_utils.h>
+#include <yang/adaptor_config.h>
+
+#include <vector>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::test;
+using namespace isc::yang;
+
+namespace {
+
+/// @brief Fixture class that helps testing AdaptorConfig
+class AdaptorConfigTest : public ::testing::Test {
+public:
+
+/// @brief Load an example JSON config
+///
+/// @param fname name of the file (expected to be a valid JSON config)
+/// @param v6 - false=v4, true=v6
+/// @param result - JSON converted by a AdaptorConfig::preprocess[4/6]
+void testFile(const string& fname, bool v6, ElementPtr& result) {
+    ElementPtr json;
+    ElementPtr reference_json;
+
+    string decommented = decommentJSONfile(fname);
+
+    EXPECT_NO_THROW_LOG(json = Element::fromJSONFile(decommented, true));
+    reference_json = moveComments(json);
+
+    // remove the temporary file
+    EXPECT_NO_THROW_LOG(::remove(decommented.c_str()));
+
+    string before = json->str();
+    if (v6) {
+        ASSERT_NO_THROW_LOG(AdaptorConfig::preProcess6(json));
+    } else {
+        ASSERT_NO_THROW_LOG(AdaptorConfig::preProcess4(json));
+    }
+    string after = json->str();
+
+    EXPECT_FALSE(before.empty());
+    EXPECT_FALSE(after.empty());
+
+    result = json;
+}
+
+};  // AdaptorConfigTest
+
+TEST_F(AdaptorConfigTest, loadExamples4) {
+    vector<string> configs = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "dnr.json",
+        "global-reservations.json",
+        "ha-load-balancing-server1-mt-with-tls.json",
+        "ha-load-balancing-server2-mt.json",
+        "hooks.json",
+        "hooks-radius.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "single-subnet.json",
+        "vendor-specific.json",
+        "vivso.json",
+        "with-ddns.json",
+    };
+
+    ElementPtr x;
+
+    for (int i = 0; i<configs.size(); i++) {
+        x.reset();
+        testFile(string(CFG_EXAMPLES) + "/kea4/" + configs[i], false, x);
+        ASSERT_TRUE(x);
+    }
+}
+
+TEST_F(AdaptorConfigTest, loadExamples6) {
+    vector<string> configs = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "dnr.json",
+        "duid.json",
+        "global-reservations.json",
+        "ha-hot-standby-server1-with-tls.json",
+        "ha-hot-standby-server2.json",
+        "hooks.json",
+        "iPXE.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "simple.json",
+        "softwire46.json",
+        "stateless.json",
+        "tee-times.json",
+        "with-ddns.json",
+    };
+    ElementPtr x;
+
+    for (int i = 0; i<configs.size(); i++) {
+        x.reset();
+        testFile(string(CFG_EXAMPLES) + "/kea6/" + configs[i], true, x);
+        ASSERT_TRUE(x);
+    }
+}
+
+/// In general, the AdatorConfig class doesn't need very thorough
+/// direct tests, as there will be tests that will process whole
+/// configuration that will in turn use AdaptorConfig calls.
+/// Nevertheless, here are some ideas for tests. We hope to have
+/// them implemented one day.
+///
+/// @todo: Check subnet-id assigned in subnets using any config
+/// @todo: Check shared-networks assign id using kea4/shared-network.json
+/// @todo: Check option classes using kea4/classify2.json
+/// @todo: Check option data using kea6/with-ddns.json
+/// @todo: Check option defs using kea6/dhcpv4-over-dhcpv6.json
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_host_unittests.cc b/src/lib/yang/tests/adaptor_host_unittests.cc
new file mode 100644
index 0000000..0d50632
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_host_unittests.cc
@@ -0,0 +1,119 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_host.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that quoteIdentifier does not touch an identifier which
+// has a type different from flex-d.
+TEST(AdaptorHostTest, notFlexId) {
+    string config = "{\n"
+        " \"hw-address\": \"1a:1b:1c:1d:1e:1f\",\n"
+        " \"ip-address\": \"192.0.2.201\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that quoteIdentifier does not touch a flex-id identifier
+// without quotes.
+TEST(AdaptorHostTest, noQuote) {
+    string config = "{\n"
+        " \"flex-id\": \"s0mEVaLue\",\n"
+        " \"ip-address\": \"192.0.2.206\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that quoteIdentifier removes quotes from a flex-id identifier.
+TEST(AdaptorHostTest, quotes) {
+    string config = "{\n"
+        " \"flex-id\": \"'somevalue'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier removes quotes from a flex-id identifier
+// but does not interpret a quote in the middle.
+TEST(AdaptorHostTest, extraQuote) {
+    string config = "{\n"
+        " \"flex-id\": \"'some'value'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:27:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier works on not standard characters too.
+TEST(AdaptorHostTest, notStandard) {
+    string config = "{\n"
+        " \"flex-id\": \"'some\\\"value'\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:22:76:61:6c:75:65", id->stringValue());
+}
+
+// Verifies that quoteIdentifier works on not standard characters too
+// even without quotes.
+TEST(AdaptorHostTest, notQuoted) {
+    string config = "{\n"
+        " \"flex-id\": \"some\\\"value\",\n"
+        " \"ip-addresses\": \"2001:db8:1:cafe::2\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorHost::quoteIdentifier(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr id = json->get("flex-id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::string, id->getType());
+    EXPECT_EQ("73:6f:6d:65:22:76:61:6c:75:65", id->stringValue());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/adaptor_option_unittests.cc b/src/lib/yang/tests/adaptor_option_unittests.cc
new file mode 100644
index 0000000..9fdcb9c
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_option_unittests.cc
@@ -0,0 +1,245 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <dhcp/dhcp4.h>
+#include <dhcp/dhcp6.h>
+#include <dhcp/option_data_types.h>
+#include <dhcp/option_space.h>
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_option.h>
+#include <yang/netconf_error.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that setSpace adds a space to an option without this entry.
+TEST(AdaptorOptionTest, setSpaceNoSpace) {
+    string config = "{\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorOption::setSpace(json, "foo"));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr space = json->get("space");
+    ASSERT_TRUE(space);
+    ASSERT_EQ(Element::string, space->getType());
+    EXPECT_EQ("foo", space->stringValue());
+}
+
+// Verifies that setSpace does not change to an option with space.
+TEST(AdaptorOptionTest, setSpace) {
+    string config = "{\n"
+        " \"space\": \"dhcp4\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorOption::setSpace(json, "foo"));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that checkType accepts an option with type.
+TEST(AdaptorOptionTest, checkType) {
+    string config = "{\n"
+        " \"type\": \"string\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_NO_THROW_LOG(AdaptorOption::checkType(json));
+}
+
+// Verifies that checkType does not accept an option without type.
+TEST(AdaptorOptionTest, checkTypeNoType) {
+    string config = "{\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_THROW_MSG(AdaptorOption::checkType(json), MissingKey,
+                     "missing type in option definition {  }");
+}
+
+// Verifies that checkCode accepts an option with code.
+TEST(AdaptorOptionTest, checkCode) {
+    string config = "{\n"
+        " \"code\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_NO_THROW_LOG(AdaptorOption::checkCode(json));
+}
+
+// Verifies that checkCode does not accept an option without code.
+TEST(AdaptorOptionTest, checkCodeNoCode) {
+    string config = "{\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    EXPECT_THROW_MSG(AdaptorOption::checkCode(json), MissingKey, "missing code in option {  }");
+}
+
+// Verifies that collect works as expected.
+TEST(AdaptorOptionTest, collect) {
+    string config = "{\n"
+        " \"code\": 123,\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::collect(json, codes));
+    EXPECT_EQ(1, codes.size());
+    EXPECT_EQ(123, codes["bar@foo"]);
+    EXPECT_FALSE(codes.contains("foo@bar"));
+}
+
+// Verifies that collect skips an already known option definition.
+TEST(AdaptorOptionTest, collectKnown) {
+    string config = "{\n"
+        " \"code\": 123,\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes = { { "bar@foo", 111 } };
+    ASSERT_NO_THROW_LOG(AdaptorOption::collect(json, codes));
+    EXPECT_EQ(1, codes.size());
+    EXPECT_EQ(111, codes["bar@foo"]);
+}
+
+// Verifies that setCode adds a code to an option without this entry
+// when the code is available in the map.
+TEST(AdaptorOptionTest, setCodeNoCode) {
+    string config = "{\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    OptionCodes codes = { { "bar@foo", 123 } };
+    EXPECT_NO_THROW_LOG(AdaptorOption::setCode(json, codes));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr code = json->get("code");
+    ASSERT_TRUE(code);
+    ASSERT_EQ(Element::integer, code->getType());
+    EXPECT_EQ(123, code->intValue());
+}
+
+// Verifies that setCode does not change to an option with code.
+TEST(AdaptorOptionTest, setCode) {
+    string config = "{\n"
+        " \"code\": \"dhcp4\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    OptionCodes codes;
+    EXPECT_NO_THROW_LOG(AdaptorOption::setCode(json, codes));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that setCode raises an error on option without name and code.
+TEST(AdaptorOptionTest, setCodeNoName) {
+    string config = "{\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    EXPECT_THROW_MSG(AdaptorOption::setCode(json, codes), MissingKey,
+                     "missing name and code in option { \"space\": \"bar\" }");
+}
+
+// Note the code assumes there is a space, i.e. setSpace was called.
+
+// Verifies that setCode raises an error on option without code but
+// the code is not available in the map.
+TEST(AdaptorOptionTest, setCodeNotInMap) {
+    string config = "{\n"
+        " \"name\": \"foo\",\n"
+        " \"space\": \"bar\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    OptionCodes codes;
+    EXPECT_THROW_MSG(AdaptorOption::setCode(json, codes), MissingKey,
+                     "can't get code from option { \"name\": \"foo\", \"space\": \"bar\" }");
+}
+
+/// @brief Test class to make initCodes public.
+class TestAdaptorOption : public AdaptorOption {
+public:
+    using AdaptorOption::initCodesInternal;
+};  // TestAdaptorOption
+
+// Verifies that initCodesInternal works as expected.
+TEST(AdaptorOptionTest, initCodesInternal) {
+    const OptionDefParams DEFS[] = {
+        { "subnet-mask", DHO_SUBNET_MASK, DHCP4_OPTION_SPACE,
+          OPT_IPV4_ADDRESS_TYPE, false, 0, 0, "" },
+        { "time-offset", DHO_TIME_OFFSET, DHCP4_OPTION_SPACE, OPT_INT32_TYPE,
+          false, 0, 0, "" }
+    };
+    const size_t DEFS_SIZE = sizeof(DEFS) / sizeof(DEFS[0]);
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(TestAdaptorOption::initCodesInternal(codes,
+                                                         DHCP4_OPTION_SPACE,
+                                                         DEFS,
+                                                         DEFS_SIZE));
+    ASSERT_EQ(2, codes.size());
+    EXPECT_EQ(DHO_SUBNET_MASK, codes["dhcp4@subnet-mask"]);
+    EXPECT_EQ(DHO_TIME_OFFSET, codes["dhcp4@time-offset"]);
+}
+
+// Verifies that initCodes works as expected with DHCPv4.
+TEST(AdaptorOptionTest, initCodes4) {
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::initCodes(codes, DHCP4_OPTION_SPACE));
+    EXPECT_EQ(DHO_SUBNET_MASK, codes["dhcp4@subnet-mask"]);
+    EXPECT_EQ(DHO_TIME_OFFSET, codes["dhcp4@time-offset"]);
+    EXPECT_FALSE(codes.contains("dhcp6@clientid"));
+
+    // initCodes loads last resort too.
+    EXPECT_EQ(DHO_VENDOR_ENCAPSULATED_OPTIONS,
+              codes["dhcp4@vendor-encapsulated-options"]);
+
+    // and DOCSIS3.
+    EXPECT_EQ(2, codes["vendor-4491@tftp-servers"]);
+}
+
+// Verifies that initCodes works as expected with DHCPv6.
+TEST(AdaptorOptionTest, initCodes6) {
+    OptionCodes codes;
+    ASSERT_NO_THROW_LOG(AdaptorOption::initCodes(codes, DHCP6_OPTION_SPACE));
+    EXPECT_EQ(D6O_CLIENTID, codes["dhcp6@clientid"]);
+    EXPECT_EQ(D6O_SERVERID, codes["dhcp6@serverid"]);
+    EXPECT_FALSE(codes.contains("dhcp4@subnet-mask"));
+
+    // initCodes loads DOCSIS3 too.
+    EXPECT_EQ(32, codes["vendor-4491@tftp-servers"]);
+
+    // Various MAP suboptions.
+    EXPECT_EQ(D6O_S46_BR, codes["s46-cont-mape-options@s46-br"]);
+    EXPECT_EQ(D6O_S46_V4V6BIND, codes["s46-cont-lw-options@s46-v4v6bind"]);
+    EXPECT_EQ(D6O_S46_PORTPARAMS, codes["s46-v4v6bind-options@s46-portparams"]);
+
+    // And ISC space.
+    EXPECT_EQ(ISC_V6_4O6_INTERFACE, codes["vendor-2495@4o6-interface"]);
+}
+
+}  //anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_pool_unittests.cc b/src/lib/yang/tests/adaptor_pool_unittests.cc
new file mode 100644
index 0000000..6152834
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_pool_unittests.cc
@@ -0,0 +1,276 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_pool.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies that canonizePool does not touch a prefix without space.
+TEST(AdaptorPoolTest, canonizePoolPrefixNoSpace) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.128/28\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorPool::canonizePool(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that canonizePool does not touch a canonical range.
+TEST(AdaptorPoolTest, canonizePoolRange) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1 - 192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorPool::canonizePool(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies that canonizePool removes spaces from a prefix.
+TEST(AdaptorPoolTest, canonizePoolPrefixSpaces) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.128 /\t28\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.128/28", pool->stringValue());
+}
+
+// Verifies that canonizePool adds two spaces from a range.
+TEST(AdaptorPoolTest, canonizePoolRangeNoSpace) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1-192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.1 - 192.0.2.200", pool->stringValue());
+}
+
+// Verifies that canonizePool removes extra spaces from a range.
+TEST(AdaptorPoolTest, canonizePoolRangeExtraSpaces) {
+    string config = "{\n"
+        " \"pool\": \"192.0.2.1  -  192.0.2.200\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    EXPECT_NO_THROW_LOG(AdaptorPool::canonizePool(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr pool = json->get("pool");
+    ASSERT_TRUE(pool);
+    ASSERT_EQ(Element::string, pool->getType());
+    EXPECT_EQ("192.0.2.1 - 192.0.2.200", pool->stringValue());
+}
+
+// Verifies that fromSubnet is specific to ietf-dhcpv6-server model.
+TEST(AdaptorPoolTest, fromSubnetKea) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"192.0.2.1 - 192.0.2.100\"\n"
+        "     },{\n"
+        "         \"pool\": \"192.0.2.101 - 192.0.2.200\"\n"
+        "     } ],\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+
+    // This should be no-op for kea-dhcp4-server and kea-dhcp6-server models
+    EXPECT_NO_THROW_LOG(AdaptorPool::fromSubnet(KEA_DHCP4_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // The model is checked first.
+    EXPECT_NO_THROW_LOG(AdaptorPool::fromSubnet(KEA_DHCP6_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+
+    // Check that the model name is actually checked.
+    EXPECT_THROW_MSG(AdaptorPool::fromSubnet("non-existent-module", json, pools), NotImplemented,
+                     "fromSubnet not implemented for the model: non-existent-module");
+}
+
+// Verifies that fromSubnet works as expected.
+TEST(AdaptorPoolTest, fromSubnet) {
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\"\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\"\n"
+        "     } ],\n"
+        " \"preferred-lifetime\": 3000,\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW_LOG(AdaptorPool::fromSubnet(IETF_DHCPV6_SERVER, json, pools));
+    EXPECT_FALSE(copied->equals(*json));
+    pools = json->get("pools");
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(2, pools->size());
+    ConstElementPtr pool = pools->get(0);
+    ASSERT_TRUE(pool);
+    string expected = "{"
+        " \"pool\": \"2001:db8:1::/80\","
+        " \"preferred-lifetime\": 3000,"
+        " \"rebind-timer\": 2000,"
+        " \"renew-timer\": 1000,"
+        " \"valid-lifetime\": 4000 }";
+    EXPECT_EQ(expected, pool->str());
+    pool = pools->get(1);
+    ASSERT_TRUE(pool);
+    expected = "{"
+        " \"pool\": \"2001:db8:1:0:1::/80\","
+        " \"preferred-lifetime\": 3000,"
+        " \"rebind-timer\": 2000,"
+        " \"renew-timer\": 1000,"
+        " \"valid-lifetime\": 4000 }";
+    EXPECT_EQ(expected, pool->str());
+}
+
+// Verifies that toSubnet is specific to ietf-dhcpv6-server model.
+TEST(AdaptorPoolTest, toSubnetKea) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"192.0.2.1 - 192.0.2.100\"\n"
+        "     },{\n"
+        "         \"pool\": \"192.0.2.101 - 192.0.2.200\"\n"
+        "     } ],\n"
+        " \"valid-lifetime\": 4000,\n"
+        " \"renew-timer\": 1000,\n"
+        " \"rebind-timer\": 2000\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW_LOG(AdaptorPool::toSubnet(KEA_DHCP4_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // The model is checked first.
+    EXPECT_NO_THROW_LOG(AdaptorPool::toSubnet(KEA_DHCP6_SERVER, json, pools));
+    EXPECT_TRUE(copied->equals(*json));
+    // Model name is not free: an error is raised if it is not expected.
+    EXPECT_THROW_MSG(AdaptorPool::toSubnet("keatest-module", json, pools), NotImplemented,
+                     "toSubnet not implemented for the model: keatest-module");
+}
+
+// Verifies that toSubnet works as expected.
+TEST(AdaptorPoolTest, toSubnet) {
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     } ]\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_NO_THROW_LOG(AdaptorPool::toSubnet(IETF_DHCPV6_SERVER, json, pools));
+    EXPECT_FALSE(copied->equals(*json));
+    // Check timers.
+    ConstElementPtr timer = json->get("valid-lifetime");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("4000", timer->str());
+    timer = json->get("preferred-lifetime");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("3000", timer->str());
+    timer = json->get("renew-timer");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("1000", timer->str());
+    timer = json->get("rebind-timer");
+    ASSERT_TRUE(timer);
+    EXPECT_EQ("2000", timer->str());
+    // Timers must be removed as they are not allowed here in Kea.
+    pools = json->get("pools");
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(2, pools->size());
+    ConstElementPtr pool = pools->get(0);
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8:1::/80\" }", pool->str());
+    pool = pools->get(1);
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8:1:0:1::/80\" }", pool->str());
+}
+
+// Verifies that toSubnet fails on inconsistent input.
+TEST(AdaptorPoolTest, toSubnetBad) {
+    // Changed last rebind-timer to a different value.
+    string config = "{\n"
+        " \"subnet\": \"2001:db8:1::/64\",\n"
+        " \"pools\": [\n"
+        "     {\n"
+        "         \"pool\": \"2001:db8:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 2000\n"
+        "     },{\n"
+        "         \"pool\": \"2001:db8:1:0:1::/80\",\n"
+        "         \"preferred-lifetime\": 3000,\n"
+        "         \"valid-lifetime\": 4000,\n"
+        "         \"renew-timer\": 1000,\n"
+        "         \"rebind-timer\": 20\n"
+        "     } ]\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr pools = json->get("pools");
+    EXPECT_THROW_MSG(AdaptorPool::toSubnet(IETF_DHCPV6_SERVER, json, pools), BadValue,
+                     "inconsistent value of rebind-timer in [ { \"pool\": \"2001:db8:1::/80\", "
+                     "\"rebind-timer\": 2000 }, { \"pool\": \"2001:db8:1:0:1::/80\", "
+                     "\"rebind-timer\": 20 } ]");
+}
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_subnet_unittests.cc b/src/lib/yang/tests/adaptor_subnet_unittests.cc
new file mode 100644
index 0000000..4b744b4
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_subnet_unittests.cc
@@ -0,0 +1,214 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <dhcpsrv/subnet_id.h>
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor_subnet.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::dhcp;
+using namespace isc::yang;
+
+namespace {
+
+// Verifies how collectID handles a subnet entry without ID.
+TEST(AdaptorSubnetTest, collectNoId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set;
+    bool ret = true;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_FALSE(ret);
+    EXPECT_EQ(0, set.size());
+}
+
+// Verifies how collectID handles a subnet entry with an ID.
+TEST(AdaptorSubnetTest, collectId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set;
+    bool ret = false;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_TRUE(ret);
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+}
+
+// Verifies how collectID handles a subnet entry with an ID which is
+// already known: the set is not updated.
+TEST(AdaptorSubnetTest, collectKnownId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ConstElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    SubnetIDSet set = { 123 };
+    bool ret = false;
+    ASSERT_NO_THROW_LOG(ret = AdaptorSubnet::collectID(json, set));
+    EXPECT_TRUE(ret);
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+}
+
+// Verifies how assignID handles a subnet entry without ID: the next ID
+// is assigned, the set is updated and the next ID is incremented.
+TEST(AdaptorSubnetTest, assignNoId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set;
+    SubnetID next_id = 123;
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_EQ(1, set.size());
+    EXPECT_EQ(1, set.count(123));
+    EXPECT_EQ(124, next_id);
+    ConstElementPtr id = json->get("id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::integer, id->getType());
+    EXPECT_EQ(123, id->intValue());
+}
+
+// Verifies how assignID handles a subnet entry without ID but with the
+// candidate ID already used: the used value is skipped.
+TEST(AdaptorSubnetTest, assignNoIdUsed) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set = { 123 };
+    SubnetID next_id = 123;
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_EQ(2, set.size());
+    EXPECT_EQ(1, set.count(123));
+    EXPECT_EQ(1, set.count(124));
+    EXPECT_EQ(125, next_id);
+    ConstElementPtr id = json->get("id");
+    ASSERT_TRUE(id);
+    ASSERT_EQ(Element::integer, id->getType());
+    EXPECT_EQ(124, id->intValue());
+}
+
+// Verifies how assignID handles a subnet entry with ID: no change.
+TEST(AdaptorSubnetTest, assignId) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"id\": 123\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    SubnetIDSet set; // ignored.
+    SubnetID next_id = 123; // ignored.
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::assignID(json, set, next_id));
+    EXPECT_TRUE(copied->equals(*json));
+    EXPECT_EQ(0, set.size());
+    EXPECT_EQ(123, next_id);
+}
+
+// Verifies how updateRelay handles a subnet entry without relay: no change.
+TEST(AdaptorSubnetTest, updateNoRelay) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\"\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies how updateRelay handles a subnet entry with empty relay:
+// the relay entry is useless and removed.
+TEST(AdaptorSubnetTest, updateEmptyRelay) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": { }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_FALSE(json->get("relay"));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has empty addresses: the relay entry is useless and removed.
+TEST(AdaptorSubnetTest, updateRelayEmptyAddresses) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-addresses\": [ ]\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    EXPECT_FALSE(json->get("relay"));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has addresses: no change.
+TEST(AdaptorSubnetTest, updateRelayAddresses) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-addresses\": [ \"192.168.1.1\" ]\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_TRUE(copied->equals(*json));
+}
+
+// Verifies how updateRelay handles a subnet entry with relay which
+// has only address: the address is moved to a new list.
+TEST(AdaptorSubnetTest, updateRelayAddress) {
+    string config = "{\n"
+        " \"subnet\": \"192.0.2.0/24\",\n"
+        " \"relay\": {\n"
+        "     \"ip-address\": \"192.168.1.1\"\n"
+        " }\n"
+        "}";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    ConstElementPtr copied = copy(json);
+    ASSERT_NO_THROW_LOG(AdaptorSubnet::updateRelay(json));
+    EXPECT_FALSE(copied->equals(*json));
+    ConstElementPtr relay = json->get("relay");
+    ASSERT_TRUE(relay);
+    string expected = "{ \"ip-addresses\": [ \"192.168.1.1\" ] }";
+    EXPECT_EQ(expected, relay->str());
+}
+
+// It does not make sense to have both ip-address and ip-addresses...
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/adaptor_unittests.cc b/src/lib/yang/tests/adaptor_unittests.cc
new file mode 100644
index 0000000..f95d5d3
--- /dev/null
+++ b/src/lib/yang/tests/adaptor_unittests.cc
@@ -0,0 +1,398 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/adaptor.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+
+namespace {
+
+// Test that get context works as expected i.e. moves a comment into
+// the user context creating it if not exists.
+TEST(AdaptorTest, getContext) {
+    // Empty.
+    string config = "{\n"
+        "}\n";
+    ElementPtr json = Element::fromJSON(config);
+    ConstElementPtr context;
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    EXPECT_FALSE(context);
+
+    // No relevant.
+    config = "{\n"
+        " \"foo\": 1\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    EXPECT_FALSE(context);
+
+    // User context.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": { \"bar\": 2 }\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2 }", context->str());
+
+    // Comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"comment\": \"a comment\" }", context->str());
+
+    // User context and comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": { \"bar\": 2 },\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2, \"comment\": \"a comment\" }", context->str());
+
+    // User context with conflicting comment and comment.
+    config = "{\n"
+        " \"foo\": 1,\n"
+        " \"user-context\": {\n"
+        "   \"bar\": 2,\n"
+        "   \"comment\": \"conflicting\"\n"
+        "  },\n"
+        " \"comment\": \"a comment\"\n"
+        "}\n";
+    json = Element::fromJSON(config);
+    ASSERT_NO_THROW_LOG(context = Adaptor::getContext(json));
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"bar\": 2, \"comment\": \"a comment\" }", context->str());
+}
+
+// Test that fromParent works as expected i.e. moves parameters from the
+// parent to children and not overwrite them.
+TEST(AdaptorTest, fromParent) {
+    string config = "{\n"
+        " \"param1\": 123,\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param1\": 234\n"
+        "  },{\n"
+        "   \"another\": \"entry\"\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    ElementPtr json = Element::fromJSON(config);
+    EXPECT_NO_THROW_LOG(Adaptor::fromParent("param1", json, json->get("list")));
+    EXPECT_NO_THROW_LOG(Adaptor::fromParent("param2", json, json->get("list")));
+    EXPECT_NO_THROW_LOG(Adaptor::fromParent("param3", json, json->get("list")));
+
+    string expected = "{\n"
+        " \"param1\": 123,\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param1\": 234,\n"
+        "   \"param2\": \"foo\"\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param1\": 123,\n"
+        "   \"param2\": \"foo\"\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+}
+
+// Test that toParent works as expected i.e. moves parameters from children
+// to the parent throwing when a value differs between two children.
+TEST(AdaptorTest, toParent) {
+    string config = "{\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param2\": \"foo\",\n"
+        "   \"param3\": 234,\n"
+        "   \"param4\": true\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param2\": \"foo\",\n"
+        "   \"param3\": 123,\n"
+        "   \"param5\": false\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    ElementPtr json = Element::fromJSON(config);
+    EXPECT_NO_THROW_LOG(Adaptor::toParent("param1", json, json->get("list")));
+    EXPECT_TRUE(json->equals(*Element::fromJSON(config)));
+
+    string expected = "{\n"
+        " \"param2\": \"foo\",\n"
+        " \"list\": [\n"
+        "  {\n"
+        "   \"param3\": 234,\n"
+        "   \"param4\": true\n"
+        "  },{\n"
+        "   \"another\": \"entry\",\n"
+        "   \"param3\": 123,\n"
+        "   \"param5\": false\n"
+        "  }\n"
+        " ]\n"
+        "}\n";
+
+    EXPECT_NO_THROW_LOG(Adaptor::toParent("param2",json, json->get("list")));
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+
+    // param[345] have different values so it should throw.
+    EXPECT_THROW_MSG(Adaptor::toParent("param3", json, json->get("list")), BadValue,
+                     "inconsistent value of param3 in [ { \"param3\": 234, \"param4\": true }, { "
+                     "\"another\": \"entry\", \"param3\": 123, \"param5\": false } ]");
+    EXPECT_THROW_MSG(Adaptor::toParent("param4", json, json->get("list")), BadValue,
+                     "inconsistent value of param4 in [ { \"param3\": 234, \"param4\": true }, { "
+                     "\"another\": \"entry\", \"param3\": 123, \"param5\": false } ]");
+    EXPECT_THROW_MSG(Adaptor::toParent("param5", json, json->get("list")), BadValue,
+                     "inconsistent value of param5 in [ { \"param3\": 234, \"param4\": true }, { "
+                     "\"another\": \"entry\", \"param3\": 123, \"param5\": false } ]");
+
+    // And not modify the value.
+    EXPECT_TRUE(json->equals(*Element::fromJSON(expected)));
+}
+
+// Test for modify (maps & insert).
+TEST(AdaptorTest, modifyMapInsert) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 1234\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test\": 1234\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (maps & replace).
+TEST(AdaptorTest, modifyMapReplace) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test1\": 1234,\n"
+        "     \"test2\": 1234\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test1\",\n"
+        "  \"value\": 5678\n"
+        "},{\n"
+        "  \"action\": \"replace\",\n"
+        "  \"key\": \"test2\",\n"
+        "  \"value\": 5678\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test1\": 1234,\n"
+        "     \"test2\": 5678\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (maps & delete).
+TEST(AdaptorTest, modifyMapDelete) {
+    string config = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "     \"test\": 1234\n"
+        "}}}\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ \"foo\", \"bar\" ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": \"test\"\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "{\n"
+        " \"foo\": {\n"
+        "   \"bar\": {\n"
+        "}}}\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (lists & insert).
+TEST(AdaptorTest, modifyListInsert) {
+    string config = "[\n"
+        "[{\n"
+        " \"foo\": \"bar\"\n"
+        "}]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ 0, { \"key\": \"foo\", \"value\": \"bar\" }]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 1234\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[\n"
+        "[{\n"
+        " \"foo\": \"bar\",\n"
+        " \"test\": 1234\n"
+        "}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+// Test for modify (list all & insert).
+TEST(AdaptorTest, modifyListAllInsert) {
+    string config = "[\n"
+        "{},\n"
+        "{},\n"
+        "{ \"test\": 1234 },\n"
+        "]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ -1 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"insert\",\n"
+        "  \"key\": \"test\",\n"
+        "  \"value\": 5678\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[\n"
+        "{ \"test\": 5678 },\n"
+        "{ \"test\": 5678 },\n"
+        "{ \"test\": 1234 }\n"
+        "]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+TEST(AdaptorTest, modifyListDelete) {
+    string config = "[[\n"
+        "{\n"
+        " \"foo\": \"bar\"\n"
+        "},{\n"
+        "},[\n"
+        "0, 1, 2, 3\n"
+        "]]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    string spath = "[ 0 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    // Put the positional first as it applies after previous actions...
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": 2\n"
+        "},{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": { \"key\": \"foo\", \"value\": \"bar\" }\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[[{}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+TEST(AdaptorTest, modifyListAllDelete) {
+    string config = "[[\n"
+        "{\n"
+        " \"foo\": \"bar\"\n"
+        "},{\n"
+        "},[\n"
+        "0, 1, 2, 3\n"
+        "]]]\n";
+    ElementPtr json;
+    ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+    // The main change from the previous unit test is key 0 -> -1 so
+    // modify() applies the delete to all elements vs only the first one.
+    string spath = "[ -1 ]";
+    ConstElementPtr path;
+    ASSERT_NO_THROW_LOG(path = Element::fromJSON(spath));
+    // Put the positional first as it applies after previous actions...
+    string sactions = "[\n"
+        "{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": 2\n"
+        "},{\n"
+        "  \"action\": \"delete\",\n"
+        "  \"key\": { \"key\": \"foo\", \"value\": \"bar\" }\n"
+        "}]\n";
+    ConstElementPtr actions;
+    ASSERT_NO_THROW_LOG(actions = Element::fromJSON(sactions));
+    string result = "[[{}]]\n";
+    ConstElementPtr expected;
+    ASSERT_NO_THROW_LOG(expected = Element::fromJSON(result));
+    ASSERT_NO_THROW_LOG(Adaptor::modify(path, actions, json));
+    EXPECT_TRUE(expected->equals(*json));
+}
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/config_unittests.cc b/src/lib/yang/tests/config_unittests.cc
new file mode 100644
index 0000000..46b591d
--- /dev/null
+++ b/src/lib/yang/tests/config_unittests.cc
@@ -0,0 +1,392 @@
+// 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 <gtest/gtest.h>
+
+#include <testutils/io_utils.h>
+#include <testutils/user_context_utils.h>
+#include <yang/tests/json_configs.h>
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/tests/yang_configs.h>
+#include <yang/translator_config.h>
+#include <yang/yang_models.h>
+
+#include <iostream>
+#include <vector>
+
+#include <boost/algorithm/string.hpp>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Return the difference between two strings
+///
+/// Use the gtest >= 1.8.0 tool which builds the difference between
+/// two vectors of lines.
+///
+/// @param left left string
+/// @param right right string
+/// @return the unified diff between left and right
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+string generateDiff(string left, string right) {
+    vector<string> left_lines;
+    boost::split(left_lines, left, boost::is_any_of("\n"));
+    vector<string> right_lines;
+    boost::split(right_lines, right, boost::is_any_of("\n"));
+    using namespace testing::internal;
+    return (edit_distance::CreateUnifiedDiff(left_lines, right_lines));
+}
+#else
+string generateDiff(string, string) {
+    return ("");
+}
+#endif
+
+/// @brief Test Fixture class for Yang <-> JSON configs.
+class ConfigTest : public ::testing::Test {
+public:
+    ConfigTest() : session_(Connection{}.sessionStart()) {
+        session_.switchDatastore(Datastore::Candidate);
+    }
+    virtual ~ConfigTest() = default;
+
+    void SetUp() override {
+        translator_.reset(new Translator(session_, model_));
+        cleanModelData();
+    }
+
+    void TearDown() override {
+        cleanModelData();
+        translator_.reset();
+        SysrepoSetup::cleanSharedMemory();
+    }
+
+    void cleanModelData() {
+        string toplevel_node("config");
+        if (model_ == IETF_DHCPV6_SERVER) {
+            toplevel_node = "server";
+        }
+        translator_->deleteItem("/" + model_ + ":" + toplevel_node);
+    }
+
+    /// @brief Reset session.
+    void resetSession() {
+        SetUp();
+    }
+
+    /// @brief Loads YANG configuration from specified tree.
+    ///
+    /// @param tree The Yang tree to load.
+    void load(const YRTree& tree) {
+        YangRepr repr(model_);
+        repr.set(tree, session_);
+    }
+
+    /// @brief Loads JSON configuration from specified Element tree.
+    ///
+    /// @param json The JSON tree to load.
+    void load(ElementPtr json) {
+        TranslatorConfig tc(session_, model_);
+        tc.setConfig(json);
+    }
+
+    /// @brief Load a cofiguration from a string containing JSON.
+    ///
+    /// @param config The JSON tree to load in textual format.
+    void load(const string& config) {
+        ElementPtr json;
+        ASSERT_NO_THROW_LOG(json = Element::fromJSON(config));
+        load(json);
+    }
+
+    /// @brief Load a configuration from JSON file.
+    ///
+    /// @param filename The name of the JSON file to load,
+    ConstElementPtr loadFile(const string& filename) {
+        string decommented = isc::test::decommentJSONfile(filename);
+        ElementPtr json = Element::fromJSONFile(decommented, true);
+        ::remove(decommented.c_str());
+        load(json);
+        return (json);
+    }
+
+    /// @brief Returns YANG tree configuration.
+    YRTree getYang() {
+        YangRepr repr(model_);
+        return (repr.get(session_));
+    }
+
+    /// @brief Returns configuration in JSON (translated by TranslatorConfig)
+    ConstElementPtr getJSON() {
+        TranslatorConfig tc(session_, model_);
+        return (tc.getConfig());
+    }
+
+    /// @brief Retrieves configuration as text (in pretty JSON format).
+    string getText() {
+        return (isc::data::prettyPrint(getJSON()));
+    }
+
+    /// @brief Verify Yang.
+    ///
+    /// @param expected The expected Yang tree.
+    bool verify(const YRTree& expected) {
+        YangRepr repr(model_);
+        return (repr.verify(expected, session_, cerr));
+    }
+
+    /// @brief Verify JSON.
+    ///
+    /// @param expected The expected JSON tree.
+    bool verify(ConstElementPtr expected) {
+        TranslatorConfig tc(session_, model_);
+        ConstElementPtr content = tc.getConfig();
+        if (isEquivalent(expected, content)) {
+            return (true);
+        }
+        string wanted = prettyPrint(expected);
+        string got = prettyPrint(content);
+        cerr << "Expected:\n" << wanted << "\n"
+             << "Actual:\n" << got
+#ifdef HAVE_CREATE_UNIFIED_DIFF
+             << "\nDiff:\n" << generateDiff(wanted, got)
+#endif
+             << "\n";
+        return (false);
+    }
+
+    /// @brief Verify JSON.
+    ///
+    /// @param expected The expected JSON tree in textual format.
+    bool verify(const string& config) {
+        ConstElementPtr expected;
+        expected = Element::fromJSON(config);
+        return (verify(expected));
+    }
+
+    /// @brief The model.
+    string model_;
+
+    /// @brief The sysrepo session.
+    Session session_;
+
+    unique_ptr<Translator> translator_;
+};  // ConfigTest
+
+struct ConfigTestKeaV4 : ConfigTest {
+    ConfigTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // ConfigTestKeaV4
+struct ConfigTestKeaV6 : ConfigTest {
+    ConfigTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // ConfigTestKeaV6
+struct ConfigTestIetfV6 : ConfigTest {
+    ConfigTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};  // ConfigTestIetfV6
+
+// Check empty config with ietf-dhcpv6-server model.
+TEST_F(ConfigTestIetfV6, emptyIetf6) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(tree));
+
+    ElementPtr json = Element::fromJSON(emptyJson6);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson6));
+    EXPECT_TRUE(verify(tree));
+}
+
+// Check empty config with kea-dhcp4-server:config model.
+TEST_F(ConfigTestKeaV4, emptyKeaDhcp4) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp4));
+
+    ElementPtr json = Element::fromJSON(emptyJson4);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson4));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp4));
+}
+
+// Check empty config with kea-dhcp6-server:config model.
+TEST_F(ConfigTestKeaV6, emptyKeaDhcp6) {
+    YRTree tree;
+    ASSERT_NO_THROW_LOG(load(tree));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp6));
+
+    ElementPtr json = Element::fromJSON(emptyJson6);
+    EXPECT_TRUE(verify(json));
+    ASSERT_NO_THROW_LOG(load(json));
+    EXPECT_TRUE(verify(emptyJson6));
+    EXPECT_TRUE(verify(emptyTreeKeaDhcp6));
+}
+
+// Check subnet with two pools with ietf-dhcpv6-server model.
+// Validation will fail because the current model has a vendor-info
+// container with a mandatory ent-num leaf and no presence flag,
+// and of course the candidate YANG tree has nothing for this.
+TEST_F(ConfigTestIetfV6, subnetTwoPoolsIetf6) {
+    ASSERT_NO_THROW_LOG(load(subnetTwoPoolsTreeIetf6));
+    EXPECT_TRUE(verify(subnetTwoPoolsJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetTwoPoolsJson6));
+    EXPECT_TRUE(verify(subnetTwoPoolsTreeIetf6));
+}
+
+// Check subnet with a pool and option data lists with
+// kea-dhcp4-server:config model.
+TEST_F(ConfigTestKeaV4, subnetOptionsKeaDhcp4) {
+    ASSERT_NO_THROW_LOG(load(subnetOptionsTreeKeaDhcp4));
+    EXPECT_TRUE(verify(subnetOptionsJson4));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetOptionsJson4));
+    EXPECT_TRUE(verify(subnetOptionsTreeKeaDhcp4));
+}
+
+// Check subnet with a pool and option data lists with
+// kea-dhcp6-server:config model.
+TEST_F(ConfigTestKeaV6, subnetOptionsKeaDhcp6) {
+    ASSERT_NO_THROW_LOG(load(subnetOptionsTreeKeaDhcp6));
+    EXPECT_TRUE(verify(subnetOptionsJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetOptionsJson6));
+    EXPECT_TRUE(verify(subnetOptionsTreeKeaDhcp6));
+}
+
+// Check with timers.
+TEST_F(ConfigTestIetfV6, subnetTimersIetf6) {
+    ASSERT_NO_THROW_LOG(load(subnetTimersIetf6));
+    EXPECT_TRUE(verify(subnetTimersJson6));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(subnetTimersJson6));
+    EXPECT_TRUE(verify(subnetTimersIetf6));
+}
+
+// Check a ietf-dhcpv6-server configuration which validates.
+TEST_F(ConfigTestIetfV6, validateIetf6) {
+    ASSERT_NO_THROW_LOG(load(validTreeIetf6));
+    EXPECT_TRUE(verify(validTreeIetf6));
+}
+
+// Check Kea4 example files.
+TEST_F(ConfigTestKeaV4, examples4) {
+    vector<string> examples = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "dnr.json",
+        "global-reservations.json",
+        "ha-load-balancing-server1-mt-with-tls.json",
+        "ha-load-balancing-server2-mt.json",
+        "hooks.json",
+        "hooks-radius.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "single-subnet.json",
+        "vendor-specific.json",
+        "vivso.json",
+        "with-ddns.json",
+    };
+    for (string file : examples) {
+        resetSession();
+        string path = string(CFG_EXAMPLES) + "/kea4/" + file;
+        SCOPED_TRACE("\n* Tested file: " + path);
+        ConstElementPtr json;
+        ASSERT_NO_THROW_LOG(json = loadFile(path));
+        json = isc::test::moveComments(json);
+        EXPECT_TRUE(verify(json));
+    }
+}
+
+// Check Kea6 example files.
+TEST_F(ConfigTestKeaV6, examples6) {
+    vector<string> examples = {
+        "advanced.json",
+        "all-keys-netconf.json",
+        "all-options.json",
+        "backends.json",
+        "classify.json",
+        "classify2.json",
+        "comments.json",
+        "config-backend.json",
+        "dhcpv4-over-dhcpv6.json",
+        "dnr.json",
+        "duid.json",
+        "global-reservations.json",
+        "ha-hot-standby-server1-with-tls.json",
+        "ha-hot-standby-server2.json",
+        "hooks.json",
+        "iPXE.json",
+        "leases-expiration.json",
+        "multiple-options.json",
+        "mysql-reservations.json",
+        "pgsql-reservations.json",
+        "reservations.json",
+        "several-subnets.json",
+        "shared-network.json",
+        "simple.json",
+        "softwire46.json",
+        "stateless.json",
+        "tee-times.json",
+        "with-ddns.json",
+    };
+    for (string file : examples) {
+        resetSession();
+        string path = string(CFG_EXAMPLES) + "/kea6/" + file;
+        SCOPED_TRACE("\n* Tested file: " + path);
+        ConstElementPtr json;
+        ASSERT_NO_THROW_LOG(json = loadFile(path));
+        json = isc::test::moveComments(json);
+        EXPECT_TRUE(verify(json));
+    }
+}
+
+// Check the example in the design document.
+TEST_F(ConfigTestIetfV6, designExample) {
+    ASSERT_NO_THROW_LOG(load(designExampleTree));
+    EXPECT_TRUE(verify(designExampleJson));
+
+    resetSession();
+
+    ASSERT_NO_THROW_LOG(load(designExampleJson));
+    EXPECT_TRUE(verify(designExampleTree));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/json_configs.h b/src/lib/yang/tests/json_configs.h
new file mode 100644
index 0000000..147cbc7
--- /dev/null
+++ b/src/lib/yang/tests/json_configs.h
@@ -0,0 +1,176 @@
+// 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/.
+
+#ifndef ISC_JSON_CONFIGS_H
+#define ISC_JSON_CONFIGS_H
+
+#include <string>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief Empty DHCPv4 config.
+const std::string emptyJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv4 config with one subnet with two pools.
+const std::string subnetTwoPoolsJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "    \"subnet4\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"10.0.1.0/24\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"10.0.2.0/24\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"10.0.0.0/8\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with two pools and timers.
+const std::string subnetTimersJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"renew-timer\": 1000,\n"
+    "        \"rebind-timer\": 2000,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::2:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv4 subnet with one pool and option data lists.
+const std::string subnetOptionsJson4 =
+    "{\n"
+    "  \"Dhcp4\": {\n"
+    "    \"subnet4\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"option-data\": [\n"
+    "          {\n"
+    "            \"code\": 100,\n"
+    "            \"space\": \"dns\",\n"
+    "            \"csv-format\": false,\n"
+    "            \"data\": \"12121212\",\n"
+    "            \"always-send\": false,\n"
+    "            \"never-send\": false\n"
+    "          }\n"
+    "        ],\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"10.0.1.0/24\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"10.0.0.0/8\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief Empty DHCPv6 config.
+const std::string emptyJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with one pool and option data lists.
+const std::string subnetOptionsJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"option-data\": [\n"
+    "              {\n"
+    "                \"code\": 100,\n"
+    "                \"space\": \"dns\",\n"
+    "                \"csv-format\": false,\n"
+    "                \"data\": \"12121212\",\n"
+    "                \"always-send\": false,\n"
+    "                \"never-send\": false\n"
+    "              }\n"
+    "            ],\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief A DHCPv6 config with one subnet with two pools.
+const std::string subnetTwoPoolsJson6 =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 111,\n"
+    "        \"pools\": [\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::1:0/112\"\n"
+    "          },\n"
+    "          {\n"
+    "            \"pool\": \"2001:db8::2:0/112\"\n"
+    "          }\n"
+    "        ],\n"
+    "        \"subnet\": \"2001:db8::/48\"\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+/// @brief Example from the design document.
+const std::string designExampleJson =
+    "{\n"
+    "  \"Dhcp6\": {\n"
+    "    \"subnet6\": [\n"
+    "      {\n"
+    "        \"id\": 1,\n"
+    "        \"subnet\": \"2001:db8:20:b00::/56\",\n"
+    "        \"user-context\": { \"description\": \"example\" },\n"
+    "        \"pd-pools\": [\n"
+    "          {\n"
+    "            \"prefix\": \"2001:db8:20:b00::\",\n"
+    "            \"prefix-len\": 57\n"
+//  "            \"delegated-len\": 57\n"
+    "          }\n"
+    "        ]\n"
+    "      }\n"
+    "    ]\n"
+    "  }\n"
+    "}";
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif  // ISC_JSON_CONFIGS_H
diff --git a/src/lib/yang/tests/run_unittests.cc b/src/lib/yang/tests/run_unittests.cc
new file mode 100644
index 0000000..24870d1
--- /dev/null
+++ b/src/lib/yang/tests/run_unittests.cc
@@ -0,0 +1,21 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <log/logger_support.h>
+#include <util/unittests/run_all.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/yang/tests/sysrepo_setup.h b/src/lib/yang/tests/sysrepo_setup.h
new file mode 100644
index 0000000..4e315dd
--- /dev/null
+++ b/src/lib/yang/tests/sysrepo_setup.h
@@ -0,0 +1,96 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef SYSREPO_SETUP_H
+#define SYSREPO_SETUP_H
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/translator.h>
+#include <yang/yang_models.h>
+
+#include <sysrepo-cpp/Connection.hpp>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief Wrapper for sysrepo setup actions
+struct SysrepoSetup {
+    /// @brief Cleans shared memory.
+    ///
+    /// If a unit test crashes (mostly when migrating to a new version), it
+    /// leaves behind corrupted shared memory. Let's make sure we can run all
+    /// the following unit tests free of any side effect from said crash. This
+    /// is the equivalent of running "make shm_clean" in sysrepo:
+    /// https://github.com/sysrepo/sysrepo/blob/v1.4.140/CMakeLists.txt#L329-L334
+    static void cleanSharedMemory() {
+        call_system("rm -rf /dev/shm/sr_*");
+        call_system("rm -rf /dev/shm/srsub_*");
+    }
+
+private:
+    /// @brief Wrapper over a system() call that also checks the return value.
+    ///
+    /// @brief command the command to be run
+    static void call_system(char const* command) {
+        int return_value(system(command));
+        if (return_value != 0) {
+            std::cerr << "\"" << command << "\" exited with " << return_value
+                      << ". Unit tests may be influenced by previous abnormally "
+                         "terminated unit tests or sysrepo uses."
+                      << std::endl;
+        }
+    }
+};  // SysrepoSetup
+
+/// @brief Test Fixture template for translator tests.
+///
+/// @tparam Name The name of the translator to test.
+/// @tparam Type The type of the translator to test.
+template<char const* Name, typename translator_t>
+class GenericTranslatorTest : public ::testing::Test {
+public:
+    virtual ~GenericTranslatorTest() = default;
+
+    void SetUp() override {
+        SysrepoSetup::cleanSharedMemory();
+        sess_ = sysrepo::Connection{}.sessionStart();
+        sess_->switchDatastore(sysrepo::Datastore::Candidate);
+        translator_.reset(new translator_t(*sess_, model_));
+        cleanModelData();
+    }
+
+    void TearDown() override {
+        cleanModelData();
+        translator_.reset();
+        SysrepoSetup::cleanSharedMemory();
+    }
+
+    void cleanModelData() {
+        std::string toplevel_node("config");
+        if (model_ == IETF_DHCPV6_SERVER) {
+            toplevel_node = "server";
+        }
+        translator_->deleteItem("/" + model_ + ":" + toplevel_node);
+    }
+
+    /// @brief Sysrepo session.
+    std::optional<sysrepo::Session> sess_;
+
+    /// @brief Shared pointer to the transaction object.
+    std::shared_ptr<translator_t> translator_;
+    std::string model_;
+};  // GenericTranslatorTest
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif  // SYSREPO_SETUP_H
diff --git a/src/lib/yang/tests/translator_class_unittests.cc b/src/lib/yang/tests/translator_class_unittests.cc
new file mode 100644
index 0000000..02405c5
--- /dev/null
+++ b/src/lib/yang/tests/translator_class_unittests.cc
@@ -0,0 +1,123 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_class.h>
+#include <yang/yang_models.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const client_classes[] = "client classes";
+
+/// @brief Test fixture class for @ref TranslatorClasses.
+class TranslatorClassesTestv4 :
+    public GenericTranslatorTest<client_classes, TranslatorClasses> {
+public:
+    /// @brief Constructor
+    TranslatorClassesTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorClassesTestv4
+
+class TranslatorClassesTestv6 :
+    public GenericTranslatorTest<client_classes, TranslatorClasses> {
+public:
+    /// @brief Constructor
+    TranslatorClassesTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorClassesTestv6
+
+// This test verifies that an empty client class list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorClassesTestv4, getEmpty) {
+    // Get the client class list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr classes;
+    EXPECT_NO_THROW_LOG(classes = translator_->getClassesFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(classes);
+}
+
+// This test verifies that one client class can be properly translated
+// from YANG to JSON.
+TEST_F(TranslatorClassesTestv6, get) {
+    // Create the client class.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xclass = xpath + "/client-class[name='foo']";
+    const string& xtest = xclass + "/test";
+    string const v_test("not member('ALL')");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xtest, v_test));
+    sess_->applyChanges();
+
+    // Get the client class.
+    ConstElementPtr cclass;
+    EXPECT_NO_THROW_LOG(cclass = translator_->getClassFromAbsoluteXpath(xclass));
+    ASSERT_TRUE(cclass);
+    ElementPtr expected = Element::createMap();
+    expected->set("name", Element::create("foo"));
+    expected->set("test", Element::create("not member('ALL')"));
+    EXPECT_TRUE(expected->equals(*cclass));
+
+    // Get the client class list and check if the client class is in it.
+    ConstElementPtr classes;
+    EXPECT_NO_THROW_LOG(classes = translator_->getClassesFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(classes);
+    ASSERT_EQ(Element::list, classes->getType());
+    ASSERT_EQ(1, classes->size());
+    EXPECT_TRUE(cclass->equals(*classes->get(0)));
+}
+
+// This test verifies that an empty client class list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorClassesTestv4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr classes = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setClasses(xpath, classes));
+
+    // Get it back.
+    classes.reset();
+    EXPECT_NO_THROW_LOG(classes = translator_->getClassesFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(classes);
+}
+
+// This test verifies that one client class can be properly translated
+// from JSON to YANG.
+TEST_F(TranslatorClassesTestv6, set) {
+    // Set one client class.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr classes = Element::createList();
+    ElementPtr cclass = Element::createMap();
+    cclass->set("name", Element::create("foo"));
+    cclass->set("test", Element::create("''==''"));
+    cclass->set("only-if-required", Element::create(false));
+    classes->add(cclass);
+    EXPECT_NO_THROW_LOG(translator_->setClasses(xpath, classes));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW_LOG(got = translator_->getClassesFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::list, got->getType());
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(cclass->equals(*got->get(0)));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_control_socket_unittests.cc b/src/lib/yang/tests/translator_control_socket_unittests.cc
new file mode 100644
index 0000000..f9174db
--- /dev/null
+++ b/src/lib/yang/tests/translator_control_socket_unittests.cc
@@ -0,0 +1,174 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_control_socket.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace libyang;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const control_socket[] = "control socket";
+
+/// @brief Test fixture class for @ref TranslatorControlSocket.
+class TranslatorControlSocketTestv4 :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+    /// @brief Constructor
+    TranslatorControlSocketTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+
+    virtual ~TranslatorControlSocketTestv4() = default;
+};  // TranslatorControlSocketTestv4
+
+class TranslatorControlSocketTestv6 :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+    /// @brief Constructor
+    TranslatorControlSocketTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+
+    virtual ~TranslatorControlSocketTestv6() = default;
+};  // TranslatorControlSocketTestv6
+
+class TranslatorControlSocketTestCtrlAgent :
+    public GenericTranslatorTest<control_socket, TranslatorControlSocket> {
+public:
+    /// @brief Constructor
+    TranslatorControlSocketTestCtrlAgent() {
+        model_ = KEA_CTRL_AGENT;
+    }
+
+    virtual ~TranslatorControlSocketTestCtrlAgent() = default;
+};  // TranslatorControlSocketTestCtrlAgent
+
+// This test verifies that an empty control socket can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorControlSocketTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config/control-socket";
+    ConstElementPtr sock;
+    EXPECT_NO_THROW_LOG(sock = translator_->getControlSocketFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(sock);
+}
+
+// This test verifies that a not empty control socket can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorControlSocketTestv6, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config/control-socket";
+    const string& xname = xpath + "/socket-name";
+    const string& xtype = xpath + "/socket-type";
+    const string& xcontext = xpath + "/user-context";
+    string const s_name("/tmp/kea.sock");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_type("unix");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xtype, s_type));
+    string const s_context("{ \"foo\": 1 }");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xcontext, s_context));
+    sess_->applyChanges();
+
+    // Get it.
+    ConstElementPtr sock;
+    EXPECT_NO_THROW_LOG(sock = translator_->getControlSocketFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(sock);
+    ASSERT_EQ(Element::map, sock->getType());
+    EXPECT_EQ(3, sock->size());
+    ConstElementPtr type = sock->get("socket-type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("unix", type->stringValue());
+    ConstElementPtr name = sock->get("socket-name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("/tmp/kea.sock", name->stringValue());
+    ConstElementPtr context = sock->get("user-context");
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"foo\": 1 }", context->str());
+}
+
+// This test verifies that a not empty control socket can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorControlSocketTestCtrlAgent, set) {
+    // Set a value.
+    const string& xpath =
+        "/kea-ctrl-agent:config/control-sockets/socket[server-type='dhcp4']/control-socket";
+    ElementPtr sock = Element::createMap();
+    sock->set("socket-name", Element::create("/tmp/kea.sock"));
+    sock->set("socket-type", Element::create("unix"));
+    sock->set("comment", Element::create("a comment"));
+    try {
+        translator_->setControlSocket(xpath, sock);
+    } catch (exception const& ex) {
+        cerr << "setControlSocket fail with " << ex.what() << endl;
+    }
+    ASSERT_NO_THROW_LOG(translator_->setControlSocket(xpath, sock));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW_LOG(got = translator_->getControlSocketFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(3, got->size());
+    ConstElementPtr name = got->get("socket-name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("/tmp/kea.sock", name->stringValue());
+    ConstElementPtr type = got->get("socket-type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("unix", type->stringValue());
+    ConstElementPtr context = got->get("user-context");
+    ASSERT_TRUE(context);
+    EXPECT_EQ("{ \"comment\": \"a comment\" }", context->str());
+}
+
+// This test verifies that an empty control socket can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorControlSocketTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/control-socket";
+    const string& xname = xpath + "/socket-name";
+    const string& xtype = xpath + "/socket-type";
+    const string& xcontext = xpath + "/user-context";
+    string const s_name("/tmp/kea.sock");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_type("unix");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xtype, s_type));
+    string const s_context("{ \"foo\": 1 }");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xcontext, s_context));
+    sess_->applyChanges();
+
+    // Get it back.
+    ConstElementPtr sock;
+    EXPECT_NO_THROW_LOG(sock = translator_->getControlSocketFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(sock);
+    EXPECT_EQ(sock->str(),
+        R"({ "socket-name": "/tmp/kea.sock", "socket-type": "unix", "user-context": { "foo": 1 } })");
+
+    // Reset to empty.
+    EXPECT_NO_THROW_LOG(translator_->setControlSocket(xpath, ConstElementPtr()));
+
+    // Get it back.
+    EXPECT_NO_THROW_LOG(sock = translator_->getControlSocketFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(sock);
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_database_unittests.cc b/src/lib/yang/tests/translator_database_unittests.cc
new file mode 100644
index 0000000..4203bcb
--- /dev/null
+++ b/src/lib/yang/tests/translator_database_unittests.cc
@@ -0,0 +1,324 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_database.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const database_access[] = "database access";
+
+/// @brief Test fixture class for @ref TranslatorDatabase.
+class TranslatorDatabaseTestv4 :
+    public GenericTranslatorTest<database_access, TranslatorDatabase> {
+public:
+    TranslatorDatabaseTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+
+    virtual ~TranslatorDatabaseTestv4() = default;
+};  // TranslatorDatabaseTestv4
+
+class TranslatorDatabaseTestv6 :
+    public GenericTranslatorTest<database_access, TranslatorDatabase> {
+public:
+    TranslatorDatabaseTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+
+    virtual ~TranslatorDatabaseTestv6() = default;
+};  // TranslatorDatabaseTestv6
+
+// This test verifies that an empty database can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabaseTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    ConstElementPtr database;
+    EXPECT_NO_THROW_LOG(database = translator_->getDatabaseFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(database);
+}
+
+// This test verifies that a database can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabaseTestv4, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    const string& xtype = xpath + "/database-type";
+    const string& xinterval = xpath + "/lfc-interval";
+    string const s_type("memfile");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xtype, s_type));
+    uint32_t li = 3600;
+    string const s_interval(to_string(li));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xinterval, s_interval));
+    sess_->applyChanges();
+
+    // Get empty.
+    ConstElementPtr database;
+    EXPECT_NO_THROW_LOG(database = translator_->getDatabaseFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(database);
+    EXPECT_EQ(2, database->size());
+    ConstElementPtr type = database->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(li, interval->intValue());
+}
+
+// This test verifies that a database can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabaseTestv4, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    ElementPtr database = Element::createMap();
+    database->set("type", Element::create("memfile"));
+    database->set("lfc-interval", Element::create(3600));
+    ASSERT_NO_THROW_LOG(translator_->setDatabase(xpath, database));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW_LOG(got = translator_->getDatabaseFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(2, got->size());
+    ConstElementPtr type = got->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(3600, interval->intValue());
+}
+
+// This test verifies that an empty database can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabaseTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/lease-database";
+    const string& xtype = xpath + "/database-type";
+    const string& xinterval = xpath + "/lfc-interval";
+    string const s_type("memfile");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xtype, s_type));
+    uint32_t li = 3600;
+    string const s_interval(to_string(li));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xinterval, s_interval));
+    sess_->applyChanges();
+
+    // Reset to empty.
+    ASSERT_NO_THROW_LOG(translator_->setDatabase(xpath, ConstElementPtr()));
+
+    // Get it back.
+    ConstElementPtr database;
+    EXPECT_NO_THROW_LOG(database = translator_->getDatabaseFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(database);
+}
+
+/// @brief Translator name.
+extern char const database_accesses[] = "database accesses";
+
+/// @brief Test fixture class for @ref TranslatorDatabases.
+class TranslatorDatabasesTestv4 :
+    public GenericTranslatorTest<database_accesses, TranslatorDatabases> {
+public:
+    /// @brief Constructor
+    TranslatorDatabasesTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorDatabasesTestv4
+
+class TranslatorDatabasesTestv6 :
+    public GenericTranslatorTest<database_accesses, TranslatorDatabases> {
+public:
+    /// @brief Constructor
+    TranslatorDatabasesTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorDatabasesTestv6
+
+// This test verifies that an empty database list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabasesTestv6, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp6-server:config/hosts-database";
+    ConstElementPtr databases;
+    EXPECT_NO_THROW_LOG(databases = translator_->getDatabasesFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(databases);
+}
+
+// This test verifies that a database list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorDatabasesTestv4, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    string const s_name("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_user("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xuser, s_user));
+    string const s_password("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xpassword, s_password));
+    string const s_host("localhost");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xhost, s_host));
+    uint16_t mport = 3306;
+    string const s_port(to_string(mport));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xport, s_port));
+    sess_->applyChanges();
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW_LOG(databases = translator_->getDatabasesFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(databases);
+    ASSERT_EQ(1, databases->size());
+    ConstElementPtr database = databases->get(0);
+    ASSERT_TRUE(database);
+    EXPECT_EQ(6, database->size());
+    ConstElementPtr type = database->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("mysql", type->stringValue());
+    ConstElementPtr name = database->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("kea", name->stringValue());
+    ConstElementPtr user = database->get("user");
+    ASSERT_TRUE(user);
+    ASSERT_EQ(Element::string, user->getType());
+    EXPECT_EQ("kea", user->stringValue());
+    ConstElementPtr password = database->get("password");
+    ASSERT_TRUE(password);
+    ASSERT_EQ(Element::string, password->getType());
+    EXPECT_EQ("kea", password->stringValue());
+    ConstElementPtr host = database->get("host");
+    ASSERT_TRUE(host);
+    ASSERT_EQ(Element::string, host->getType());
+    EXPECT_EQ("localhost", host->stringValue());
+    ConstElementPtr port = database->get("port");
+    ASSERT_TRUE(port);
+    ASSERT_EQ(Element::integer, port->getType());
+    EXPECT_EQ(mport, port->intValue());
+}
+
+// This test verifies that a database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv6, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config/hosts-database";
+    ElementPtr database = Element::createMap();
+    database->set("type", Element::create("memfile"));
+    database->set("lfc-interval", Element::create(3600));
+    ElementPtr databases = Element::createList();
+    databases->add(database);
+    ASSERT_NO_THROW_LOG(translator_->setDatabases(xpath, databases));
+
+    // Get it back.
+    ConstElementPtr gots;
+    EXPECT_NO_THROW_LOG(gots = translator_->getDatabasesFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(gots);
+    ASSERT_EQ(Element::list, gots->getType());
+    ASSERT_EQ(1, gots->size());
+    ConstElementPtr got = gots->get(0);
+    ASSERT_TRUE(got);
+    ASSERT_EQ(Element::map, got->getType());
+    EXPECT_EQ(2, got->size());
+    ConstElementPtr type = got->get("type");
+    ASSERT_TRUE(type);
+    ASSERT_EQ(Element::string, type->getType());
+    EXPECT_EQ("memfile", type->stringValue());
+    ConstElementPtr interval = database->get("lfc-interval");
+    ASSERT_TRUE(interval);
+    ASSERT_EQ(Element::integer, interval->getType());
+    EXPECT_EQ(3600, interval->intValue());
+}
+
+// This test verifies that an emptied database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv4, setEmpty) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    string const s_name("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_user("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xuser, s_user));
+    string const s_password("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xpassword, s_password));
+    string const s_host("localhost");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xhost, s_host));
+    uint16_t mport = 3306;
+    string const s_port(to_string(mport));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xport, s_port));
+    sess_->applyChanges();
+
+    // Reset to empty.
+    EXPECT_NO_THROW_LOG(translator_->setDatabase(xdatabase, ConstElementPtr()));
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW_LOG(databases = translator_->getDatabasesFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(databases);
+}
+
+// This test verifies that an empty database list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorDatabasesTestv4, setEmpties) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config/hosts-database";
+    const string& xdatabase = xpath + "[database-type='mysql']";
+    const string& xname = xdatabase + "/name";
+    const string& xuser = xdatabase + "/user";
+    const string& xpassword = xdatabase + "/password";
+    const string& xhost = xdatabase + "/host";
+    const string& xport = xdatabase + "/port";
+    string const s_name("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_user("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xuser, s_user));
+    string const s_password("kea");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xpassword, s_password));
+    string const s_host("localhost");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xhost, s_host));
+    uint16_t mport = 3306;
+    string const s_port(to_string(mport));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xport, s_port));
+    sess_->applyChanges();
+
+    // Reset to empty.
+    EXPECT_NO_THROW_LOG(translator_->setDatabases(xdatabase, ConstElementPtr()));
+
+    // Get empty.
+    ConstElementPtr databases;
+    EXPECT_NO_THROW_LOG(databases = translator_->getDatabasesFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(databases);
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_host_unittests.cc b/src/lib/yang/tests/translator_host_unittests.cc
new file mode 100644
index 0000000..d51c235
--- /dev/null
+++ b/src/lib/yang/tests/translator_host_unittests.cc
@@ -0,0 +1,192 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_host.h>
+#include <yang/yang_models.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace libyang;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const host_reservations[] = "host reservations";
+
+/// @brief Test fixture class for @ref TranslatorHosts.
+class TranslatorHostsTestv4 :
+    public GenericTranslatorTest<host_reservations, TranslatorHosts> {
+public:
+    /// @brief Constructor
+    TranslatorHostsTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorHostsTestv4
+
+class TranslatorHostsTestv6 :
+    public GenericTranslatorTest<host_reservations, TranslatorHosts> {
+public:
+    /// @brief Constructor
+    TranslatorHostsTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorHostsTestv6
+
+// This test verifies that an empty host reservation list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, getEmpty) {
+    // Get the host reservation list and check if it is empty.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW_LOG(hosts = translator_->getHostsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(hosts);
+}
+
+// This test verifies that one host reservation can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, get) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the host reservation for 2001:db8::1.
+    ostringstream shost;
+    shost << xpath + "/host[identifier-type='hw-address']"
+          << "[identifier='00:01:02:03:04:05']";
+    const string& xaddr = shost.str() + "/ip-addresses";
+    string const s_addr("2001:db8::1");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xaddr, s_addr));
+    sess_->applyChanges();
+
+    // Get the host.
+    ConstElementPtr host;
+    EXPECT_NO_THROW_LOG(host = translator_->getHostFromAbsoluteXpath(shost.str()));
+    ASSERT_TRUE(host);
+    ElementPtr expected = Element::createMap();
+    ElementPtr addresses = Element::createList();
+    addresses->add(Element::create("2001:db8::1"));
+    expected->set("hw-address", Element::create("00:01:02:03:04:05"));
+    expected->set("ip-addresses", addresses);
+    EXPECT_TRUE(expected->equals(*host));
+
+    // Get the host reservation list and check if the host reservation
+    // is in it.
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW_LOG(hosts = translator_->getHostsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(hosts);
+    ASSERT_EQ(Element::list, hosts->getType());
+    ASSERT_EQ(1, hosts->size());
+    EXPECT_TRUE(host->equals(*hosts->get(0)));
+}
+
+// This test verifies that an empty host reservation list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorHostsTestv6, setEmpty) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set empty list.
+    ConstElementPtr hosts = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setHosts(xpath, hosts));
+
+    // Get it back.
+    hosts.reset();
+    EXPECT_NO_THROW_LOG(hosts = translator_->getHostsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(hosts);
+}
+
+// This test verifies that one host reservation can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorHostsTestv4, set) {
+    // Create the subnet 10.0.0.0/14 #111.
+    const string& xpath =
+        "/kea-dhcp4-server:config/subnet4[id='111']";
+    string const v_subnet("10.0.0.0/24");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set one host.
+    ElementPtr hosts = Element::createList();
+    ElementPtr host = Element::createMap();
+    host->set("flex-id", Element::create("00:ff"));
+    host->set("ip-address", Element::create("10.0.0.1"));
+    host->set("hostname", Element::create("foo"));
+    hosts->add(host);
+    EXPECT_NO_THROW_LOG(translator_->setHosts(xpath, hosts));
+
+    // Get it back.
+    hosts.reset();
+    EXPECT_NO_THROW_LOG(hosts = translator_->getHostsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(hosts);
+    ASSERT_EQ(Element::list, hosts->getType());
+    ASSERT_EQ(1, hosts->size());
+    EXPECT_TRUE(host->equals(*hosts->get(0)));
+}
+
+// This test verifies that several host reservations can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorHostsTestv6, getMany) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the host reservation for 2001:db8::1.
+    ostringstream shost;
+    shost << xpath + "/host[identifier-type='hw-address']"
+          << "[identifier='00:01:02:03:04:05']";
+    const string& xaddr = shost.str() + "/ip-addresses";
+    string const s_addr("2001:db8::1");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xaddr, s_addr));
+    sess_->applyChanges();
+
+    // Create another reservation for 2001:db8::2
+    ostringstream shost2;
+    shost2 << xpath + "/host[identifier-type='hw-address']"
+           << "[identifier='00:01:0a:0b:0c:0d']";
+    const string xaddr2 = shost2.str() + "/ip-addresses";
+    string const s_addr2("2001:db8::2");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xaddr2, s_addr2));
+    sess_->applyChanges();
+
+    // Get the host.
+    ConstElementPtr hosts;
+    EXPECT_NO_THROW_LOG(hosts = translator_->getHostsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(hosts);
+
+    EXPECT_EQ(hosts->str(),
+              "[ { \"hw-address\": \"00:01:02:03:04:05\", "
+              "\"ip-addresses\": [ \"2001:db8::1\" ] }, "
+              "{ \"hw-address\": \"00:01:0a:0b:0c:0d\", "
+              "\"ip-addresses\": [ \"2001:db8::2\" ] } ]");
+}
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/translator_logger_unittests.cc b/src/lib/yang/tests/translator_logger_unittests.cc
new file mode 100644
index 0000000..365e4bd
--- /dev/null
+++ b/src/lib/yang/tests/translator_logger_unittests.cc
@@ -0,0 +1,156 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_logger.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const logger_list[] = "logger list";
+
+/// @brief Test fixture class for @ref TranslatorLoggers.
+class TranslatorLoggersTestv4 :
+    public GenericTranslatorTest<logger_list, TranslatorLoggers> {
+public:
+    /// @brief Constructor
+    TranslatorLoggersTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorLoggersTestv4
+
+class TranslatorLoggersTestv6 :
+    public GenericTranslatorTest<logger_list, TranslatorLoggers> {
+public:
+    /// @brief Constructor
+    TranslatorLoggersTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorLoggersTestv6
+
+// This test verifies that an empty logger list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorLoggersTestv4, getEmpty) {
+    // Get empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr loggers;
+    EXPECT_NO_THROW_LOG(loggers = translator_->getLoggersFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(loggers);
+}
+
+// This test verifies that one logger can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorLoggersTestv6, get) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xlogger = xpath + "/logger[name='foo']";
+    const string& xseverity = xlogger + "/severity";
+    const string& xoption = xlogger + "/output-option[output='/bar']";
+    const string& xmaxver = xoption + "/maxver";
+    string const s_severity("WARN");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xseverity, s_severity));
+    uint32_t max_ver = 10;
+    string const s_maxver(to_string(max_ver));
+    EXPECT_NO_THROW_LOG(sess_->setItem(xmaxver, s_maxver));
+    sess_->applyChanges();
+
+    // Get empty.
+    ConstElementPtr loggers;
+    EXPECT_NO_THROW_LOG(loggers = translator_->getLoggersFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(loggers);
+    ASSERT_EQ(1, loggers->size());
+    ConstElementPtr logger = loggers->get(0);
+    ASSERT_TRUE(logger);
+    EXPECT_EQ(3, logger->size());
+    ConstElementPtr name = logger->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("foo", name->stringValue());
+    ConstElementPtr severity = logger->get("severity");
+    ASSERT_TRUE(severity);
+    ASSERT_EQ(Element::string, severity->getType());
+    EXPECT_EQ("WARN", severity->stringValue());
+    ConstElementPtr options = logger->get("output_options");
+    ASSERT_TRUE(options);
+    ASSERT_EQ(1, options->size());
+    ConstElementPtr option = options->get(0);
+    ASSERT_TRUE(option);
+    EXPECT_EQ(2, option->size());
+    ConstElementPtr output = option->get("output");
+    ASSERT_TRUE(output);
+    ASSERT_EQ(Element::string, output->getType());
+    EXPECT_EQ("/bar", output->stringValue());
+    ConstElementPtr maxver = option->get("maxver");
+    ASSERT_TRUE(maxver);
+    ASSERT_EQ(Element::integer, maxver->getType());
+    EXPECT_EQ(max_ver, maxver->intValue());
+}
+
+// This test verifies that one logger can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorLoggersTestv4, set) {
+    // Set a value.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr option = Element::createMap();
+    option->set("output", Element::create("/bar"));
+    option->set("maxver", Element::create(10));
+    ElementPtr options = Element::createList();
+    options->add(option);
+    ElementPtr logger = Element::createMap();
+    logger->set("name", Element::create("foo"));
+    logger->set("severity", Element::create("WARN"));
+    logger->set("output_options", options);
+    ElementPtr loggers = Element::createList();
+    loggers->add(logger);
+    ASSERT_NO_THROW_LOG(translator_->setLoggers(xpath, loggers));
+
+    // Get it back.
+    ConstElementPtr gots;
+    EXPECT_NO_THROW_LOG(gots = translator_->getLoggersFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(gots);
+    ASSERT_EQ(1, gots->size());
+    ConstElementPtr got = gots->get(0);
+    ASSERT_TRUE(got);
+    EXPECT_EQ(3, got->size());
+    ConstElementPtr name = got->get("name");
+    ASSERT_TRUE(name);
+    ASSERT_EQ(Element::string, name->getType());
+    EXPECT_EQ("foo", name->stringValue());
+    ConstElementPtr severity = logger->get("severity");
+    ASSERT_TRUE(severity);
+    ASSERT_EQ(Element::string, severity->getType());
+    EXPECT_EQ("WARN", severity->stringValue());
+    ConstElementPtr got_os = logger->get("output_options");
+    ASSERT_TRUE(got_os);
+    ASSERT_EQ(1, got_os->size());
+    ConstElementPtr got_o = got_os->get(0);
+    ASSERT_TRUE(got_o);
+    EXPECT_EQ(2, got_o->size());
+    ConstElementPtr output = got_o->get("output");
+    ASSERT_TRUE(output);
+    ASSERT_EQ(Element::string, output->getType());
+    EXPECT_EQ("/bar", output->stringValue());
+    ConstElementPtr maxver = got_o->get("maxver");
+    ASSERT_TRUE(maxver);
+    ASSERT_EQ(Element::integer, maxver->getType());
+    EXPECT_EQ(10, maxver->intValue());
+}
+
+/// @todo: Implement a test that will cover multiple loggers.
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_option_data_unittests.cc b/src/lib/yang/tests/translator_option_data_unittests.cc
new file mode 100644
index 0000000..3917e26
--- /dev/null
+++ b/src/lib/yang/tests/translator_option_data_unittests.cc
@@ -0,0 +1,135 @@
+// 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 <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_option_data.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const option_data_list[] = "option data list";
+
+/// @brief Test fixture class for @ref TranslatorOptionDataList.
+class TranslatorOptionDataListTestv4 :
+    public GenericTranslatorTest<option_data_list, TranslatorOptionDataList> {
+public:
+    /// @brief Constructor
+    TranslatorOptionDataListTestv4() {
+        model_ = KEA_DHCP4_SERVER;
+     }
+};  // TranslatorOptionDataListTestv4
+
+class TranslatorOptionDataListTestv6 :
+    public GenericTranslatorTest<option_data_list, TranslatorOptionDataList> {
+public:
+    /// @brief Constructor
+    TranslatorOptionDataListTestv6() {
+        model_ = KEA_DHCP6_SERVER;
+     }
+};  // TranslatorOptionDataListTestv6
+
+// This test verifies that an empty option data list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDataListTestv4, getEmpty) {
+    // Get the option data list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options;
+    EXPECT_NO_THROW_LOG(options = translator_->getOptionDataListFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option data can be properly translated
+// from YANG to JSON.
+TEST_F(TranslatorOptionDataListTestv6, get) {
+    // Create the option code 100.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xoption = xpath + "/option-data[code='100'][space='dns']";
+    const string& xformat = xoption + "/csv-format";
+    const string& xdata = xoption + "/data";
+    const string& xalways = xoption + "/always-send";
+    const string& xnever = xoption + "/never-send";
+    string const s_false("false");
+    ASSERT_NO_THROW_LOG(sess_->setItem(xformat, s_false));
+    string const s_data("12121212");
+    ASSERT_NO_THROW_LOG(sess_->setItem(xdata, s_data));
+    ASSERT_NO_THROW_LOG(sess_->setItem(xalways, s_false));
+    ASSERT_NO_THROW_LOG(sess_->setItem(xnever, s_false));
+    sess_->applyChanges();
+
+    // Get the option data.
+    ConstElementPtr option;
+    EXPECT_NO_THROW_LOG(option = translator_->getOptionDataFromAbsoluteXpath(xoption));
+    ASSERT_TRUE(option);
+    EXPECT_EQ("{"
+              " \"always-send\": false,"
+              " \"code\": 100,"
+              " \"csv-format\": false,"
+              " \"data\": \"12121212\","
+              " \"never-send\": false,"
+              " \"space\": \"dns\""
+              " }",
+              option->str());
+
+    // Get the option data list.
+    ConstElementPtr options;
+    EXPECT_NO_THROW_LOG(options = translator_->getOptionDataListFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(options);
+    ASSERT_EQ(Element::list, options->getType());
+    EXPECT_EQ(1, options->size());
+    EXPECT_TRUE(option->equals(*options->get(0)));
+}
+
+// This test verifies that an empty option data list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDataListTestv4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setOptionDataList(xpath, options));
+
+    // Get it back.
+    options.reset();
+    EXPECT_NO_THROW_LOG(options = translator_->getOptionDataListFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option data can be properly translated
+// from JSON to YANG.
+TEST_F(TranslatorOptionDataListTestv6, set) {
+    // Set one option data.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr options = Element::createList();
+    ElementPtr option = Element::createMap();
+    option->set("code", Element::create(100));
+    option->set("space", Element::create("dns"));
+    option->set("csv-format", Element::create(false));
+    option->set("data", Element::create("12121212"));
+    option->set("always-send", Element::create(false));
+    option->set("never-send", Element::create(false));
+    options->add(option);
+    EXPECT_NO_THROW_LOG(translator_->setOptionDataList(xpath, options));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW_LOG(got = translator_->getOptionDataListFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(option->equals(*got->get(0)));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_option_def_unittests.cc b/src/lib/yang/tests/translator_option_def_unittests.cc
new file mode 100644
index 0000000..8482b93
--- /dev/null
+++ b/src/lib/yang/tests/translator_option_def_unittests.cc
@@ -0,0 +1,138 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_option_def.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const option_definition_list[] = "option definition list";
+
+/// @brief Test fixture class for @ref TranslatorOptionDefList.
+class TranslatorOptionDefListTestKeaV4 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+    /// @brief Constructor
+    TranslatorOptionDefListTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorOptionDefListTestKeaV4
+class TranslatorOptionDefListTestKeaV6 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+    /// @brief Constructor
+    TranslatorOptionDefListTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorOptionDefListTestKeaV6
+class TranslatorOptionDefListTestIetfV6 :
+    public GenericTranslatorTest<option_definition_list, TranslatorOptionDefList> {
+public:
+    /// @brief Constructor
+    TranslatorOptionDefListTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};  // TranslatorOptionDefListTestIetfV6
+
+// This test verifies that an empty option definition list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDefListTestKeaV4, getEmpty) {
+    // Get the option definition list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr options;
+    EXPECT_NO_THROW_LOG(options = translator_->getOptionDefListFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(options);
+}
+
+// This test verifies that one option definition can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorOptionDefListTestKeaV6, get) {
+    // Create the option code 100.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xdef = xpath + "/option-def[code='100'][space='isc']";
+    const string& xname = xdef + "/name";
+    const string& xtype = xdef + "/type";
+    const string& xarray = xdef + "/array";
+    string const s_name("foo");
+    ASSERT_NO_THROW_LOG(sess_->setItem(xname, s_name));
+    string const s_type("string");
+    ASSERT_NO_THROW_LOG(sess_->setItem(xtype, s_type));
+    string const s_array("false");
+    ASSERT_NO_THROW_LOG(sess_->setItem(xarray, s_array));
+    sess_->applyChanges();
+
+    // Get the option def.
+    ConstElementPtr def;
+    EXPECT_NO_THROW_LOG(def = translator_->getOptionDefFromAbsoluteXpath(xdef));
+    ASSERT_TRUE(def);
+    EXPECT_EQ("{ "
+              "\"array\": false, "
+              "\"code\": 100, "
+              "\"name\": \"foo\", "
+              "\"space\": \"isc\", "
+              "\"type\": \"string\" }",
+              def->str());
+
+    // Get the option definition list.
+    ConstElementPtr defs;
+    EXPECT_NO_THROW_LOG(defs = translator_->getOptionDefListFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(defs);
+    ASSERT_EQ(Element::list, defs->getType());
+    EXPECT_EQ(1, defs->size());
+    EXPECT_TRUE(def->equals(*defs->get(0)));
+}
+
+// This test verifies that an empty option definition list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDefListTestKeaV4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr defs = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setOptionDefList(xpath, defs));
+
+    // Get it back.
+    defs.reset();
+    EXPECT_NO_THROW_LOG(defs = translator_->getOptionDefListFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(defs);
+}
+
+// This test verifies that one option definition can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorOptionDefListTestKeaV6, set) {
+    // Set one option def.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr defs = Element::createList();
+    ElementPtr def = Element::createMap();
+    def->set("code", Element::create(100));
+    def->set("name", Element::create("foo"));
+    def->set("space", Element::create("isc"));
+    def->set("type", Element::create("string"));
+    def->set("array", Element::create(false));
+    defs->add(def);
+    EXPECT_NO_THROW_LOG(translator_->setOptionDefList(xpath, defs));
+
+    // Get it back.
+    ConstElementPtr got;
+    EXPECT_NO_THROW_LOG(got = translator_->getOptionDefListFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(got);
+    ASSERT_EQ(1, got->size());
+    EXPECT_TRUE(def->equals(*got->get(0)));
+}
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/translator_pd_pool_unittests.cc b/src/lib/yang/tests/translator_pd_pool_unittests.cc
new file mode 100644
index 0000000..f8c9388
--- /dev/null
+++ b/src/lib/yang/tests/translator_pd_pool_unittests.cc
@@ -0,0 +1,296 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_pd_pool.h>
+#include <yang/yang_models.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const pd_pool_list[] = "pd pool list";
+
+/// @brief Test fixture class for @ref TranslatorPdPools.
+class TranslatorPdPoolsTestKeaV6 :
+    public GenericTranslatorTest<pd_pool_list, TranslatorPdPools> {
+public:
+    /// @brief Constructor
+    TranslatorPdPoolsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorPdPoolsTestKeaV6
+class TranslatorPdPoolsTestIetfV6 :
+    public GenericTranslatorTest<pd_pool_list, TranslatorPdPools> {
+public:
+    /// @brief Constructor
+    TranslatorPdPoolsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};  // TranslatorPdPoolsTestIetfV6
+
+// This test verifies that an empty pd pool list can be properly
+// translated from YANG to JSON using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, getEmptyIetf) {
+    // Get the pd-pool list and check if it is empty.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']/pd-pools";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getEmptyKea) {
+    // Get the pd-pool list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pd pool can be properly
+// translated from YANG to JSON using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet_subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the pd-pool 2001:db8:0:1000::/64 #222.
+    const string& xpath = subnet + "/pd-pools/pd-pool[pool-id='222']";
+    const string& prefix = xpath + "/prefix";
+    string const s_prefix("2001:db8:0:1000::/56");
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix, s_prefix));
+    const string& length = xpath + "/prefix-length";
+    uint8_t len = 56;
+    string const s_length(to_string(len));
+    EXPECT_NO_THROW_LOG(sess_->setItem(length, s_length));
+    sess_->applyChanges();
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW_LOG(pool = translator_->getPdPoolFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("prefix", Element::create("2001:db8:0:1000::"));
+    expected->set("prefix-len", Element::create(56));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pd-pool list and check if the pd-pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(subnet + "/pd-pools"));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pd pool can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the pd-pool 2001:db8:0:1000::/64.
+    const string& prefix = "2001:db8:0:1000::/56";
+    ostringstream spool;
+    spool << xpath + "/pd-pool[prefix='" << prefix << "']";
+    const string& x_delegated = spool.str() + "/delegated-len";
+    uint8_t dl = 64;
+    string const s_delegated(to_string(dl));
+    EXPECT_NO_THROW_LOG(sess_->setItem(x_delegated, s_delegated));
+    sess_->applyChanges();
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW_LOG(pool = translator_->getPdPoolFromAbsoluteXpath(spool.str()));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("prefix", Element::create("2001:db8:0:1000::"));
+    expected->set("prefix-len", Element::create(56));
+    expected->set("delegated-len", Element::create(64));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pd-pool list and check if the pd-pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from JSON to YANG using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, setEmptyIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet_subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set empty list.
+    const string& xpath = subnet + "/pd-pools";
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pd pool list can be properly
+// translated from JSON to YANG using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, setEmptyKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set empty list.
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pd pool can be properly
+// translated from JSON to YANG using the IETF model.
+TEST_F(TranslatorPdPoolsTestIetfV6, setIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges"
+        "/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet_subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set one pool.
+    const string& xpath = subnet + "/pd-pools";
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("prefix", Element::create("2001:db8:0:1000::"));
+    pool->set("prefix-len", Element::create(56));
+    pools->add(pool);
+    EXPECT_NO_THROW_LOG(translator_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pd pool can be properly
+// translated from JSON to YANG using the kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, setKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set one pool.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("prefix", Element::create("2001:db8:0:1000::"));
+    pool->set("prefix-len", Element::create(56));
+    pool->set("delegated-len", Element::create(64));
+    pools->add(pool);
+    EXPECT_NO_THROW_LOG(translator_->setPdPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that a non-empty list of pd pools can be properly
+// translated from YANG to JSON using the Kea ad hoc model.
+TEST_F(TranslatorPdPoolsTestKeaV6, getListKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the first pd-pool 2001:db8:0:1000::/56.
+    const string& prefix = "2001:db8:0:1000::/56";
+    ostringstream spool;
+    spool << xpath + "/pd-pool[prefix='" << prefix << "']";
+    const string& x_delegated = spool.str() + "/delegated-len";
+    uint8_t dl = 64;
+    string const s_delegated(to_string(dl));
+    EXPECT_NO_THROW_LOG(sess_->setItem(x_delegated, s_delegated));
+    sess_->applyChanges();
+
+    // Create the second pd-pool 2001:db8:0:2000::/56
+    const string& prefix2 = "2001:db8:0:2000::/56";
+    ostringstream spool2;
+    spool2 << xpath + "/pd-pool[prefix='" << prefix2 << "']";
+    const string& x_delegated2 = spool2.str() + "/delegated-len";
+    uint8_t dl2 = 60;
+    string const s_delegated2(to_string(dl2));
+    EXPECT_NO_THROW_LOG(sess_->setItem(x_delegated2, s_delegated2));
+    sess_->applyChanges();
+
+    // Get the pools list.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPdPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+
+    // Check that both of them are returned properly.
+    EXPECT_EQ(pools->str(),
+              "[ { \"delegated-len\": 64, \"prefix\": \"2001:db8:0:1000::\", "
+              "\"prefix-len\": 56 }, { \"delegated-len\": 60, \"prefix\": "
+              "\"2001:db8:0:2000::\", \"prefix-len\": 56 } ]");
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_pool_unittests.cc b/src/lib/yang/tests/translator_pool_unittests.cc
new file mode 100644
index 0000000..ad0d25f
--- /dev/null
+++ b/src/lib/yang/tests/translator_pool_unittests.cc
@@ -0,0 +1,252 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_pool.h>
+#include <yang/yang_models.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const pool_list[] = "pool list";
+
+/// @brief Test fixture class for @ref TranslatorPools.
+class TranslatorPoolsTestKeaV4 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+    /// @brief Constructor
+    TranslatorPoolsTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorPoolsTestKeaV4
+class TranslatorPoolsTestKeaV6 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+    /// @brief Constructor
+    TranslatorPoolsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorPoolsTestKeaV6
+class TranslatorPoolsTestIetfV6 :
+    public GenericTranslatorTest<pool_list, TranslatorPools> {
+public:
+    /// @brief Constructor
+    TranslatorPoolsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};  // TranslatorPoolsTestIetfV6
+
+// This test verifies that an empty pool list can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, getEmptyIetf) {
+    // Get the pool list and check if it is empty.
+    const string& xpath = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']/address-pools";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, getEmptyKea) {
+    // Get the pool list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config/subnet6[id='111']";
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pool can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    string const subnet_value("2001:db8::/48");
+    string const& network_prefix_path = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(network_prefix_path, subnet_value));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::1:0/112 #222.
+    const string& xpath = subnet + "/address-pools";
+    const string& prefix = xpath + "/address-pool[pool-id='222']/pool-prefix";
+    string const value("2001:db8::1:0/112");
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix, value));
+    sess_->applyChanges();
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW_LOG(pool = translator_->getPoolFromAbsoluteXpath(xpath + "/address-pool[pool-id='222']"));
+    ASSERT_TRUE(pool);
+    EXPECT_EQ("{ \"pool\": \"2001:db8::1:0/112\" }", pool->str());
+
+    // Get the pool list and check if the pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pool can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::1:0/112.
+    const string& prefix = "2001:db8::1:0/112";
+    string start_addr;
+    string end_addr;
+    ASSERT_NO_THROW_LOG(TranslatorPool::getAddresses(prefix,
+                                                 start_addr, end_addr));
+    EXPECT_EQ("2001:db8::1:0", start_addr);
+    EXPECT_EQ("2001:db8::1:ffff", end_addr);
+    ostringstream spool;
+    spool << xpath + "/pool[start-address='" << start_addr
+          << "'][end-address='" << end_addr << "']";
+    const string& x_prefix = spool.str() + "/prefix";
+    string const s_prefix("2001:db8::1:0/112");
+    EXPECT_NO_THROW_LOG(sess_->setItem(x_prefix, s_prefix));
+    sess_->applyChanges();
+
+    // Get the pool.
+    ConstElementPtr pool;
+    EXPECT_NO_THROW_LOG(pool = translator_->getPoolFromAbsoluteXpath(spool.str()));
+    ASSERT_TRUE(pool);
+    ElementPtr expected = Element::createMap();
+    expected->set("pool", Element::create("2001:db8::1:0/112"));
+    EXPECT_TRUE(expected->equals(*pool));
+
+    // Get the pool list and check if the pool is in it.
+    ConstElementPtr pools;
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, setEmptyIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet_subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set empty list.
+    const string& xpath = subnet + "/address-pools";
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that an empty pool list can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, setEmptyKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set empty list.
+    ConstElementPtr pools = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(pools);
+}
+
+// This test verifies that one pool can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorPoolsTestIetfV6, setIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& subnet = "/ietf-dhcpv6-server:server/server-config/"
+        "network-ranges/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet_subnet = subnet + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet_subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set one pool.
+    const string& xpath = subnet + "/address-pools";
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("pool", Element::create("2001:db8::1:0/112"));
+    pools->add(pool);
+    EXPECT_NO_THROW_LOG(translator_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+// This test verifies that one pool can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorPoolsTestKeaV6, setKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/kea-dhcp6-server:config/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& subnet = xpath + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(subnet, v_subnet));
+    sess_->applyChanges();
+
+    // Set one pool.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool = Element::createMap();
+    pool->set("pool",
+              Element::create("2001:db8::1 - 2001:db8::100"));
+    pools->add(pool);
+    EXPECT_NO_THROW_LOG(translator_->setPools(xpath, pools));
+
+    // Get it back.
+    pools.reset();
+    EXPECT_NO_THROW_LOG(pools = translator_->getPoolsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(pools);
+    ASSERT_EQ(Element::list, pools->getType());
+    ASSERT_EQ(1, pools->size());
+    EXPECT_TRUE(pool->equals(*pools->get(0)));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_shared_network_unittests.cc b/src/lib/yang/tests/translator_shared_network_unittests.cc
new file mode 100644
index 0000000..e897713
--- /dev/null
+++ b/src/lib/yang/tests/translator_shared_network_unittests.cc
@@ -0,0 +1,210 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_shared_network.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const shared_networks[] = "shared networks";
+
+/// @brief Test fixture class for @ref TranslatorSharedNetworks.
+class TranslatorSharedNetworksTestKeaV4 :
+    public GenericTranslatorTest<shared_networks, TranslatorSharedNetworks> {
+public:
+    /// @brief Constructor
+    TranslatorSharedNetworksTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorSharedNetworksTestKeaV4
+class TranslatorSharedNetworksTestKeaV6 :
+    public GenericTranslatorTest<shared_networks, TranslatorSharedNetworks> {
+public:
+    /// @brief Constructor
+    TranslatorSharedNetworksTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorSharedNetworksTestKeaV6
+
+// This test verifies that an empty shared network list can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorSharedNetworksTestKeaV4, getEmpty) {
+    // Get the shared network list and check if it is empty.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr networks;
+    EXPECT_NO_THROW_LOG(networks = translator_->getSharedNetworksFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(networks);
+}
+
+// This test verifies that one shared network can be properly
+// translated from YANG to JSON.
+TEST_F(TranslatorSharedNetworksTestKeaV6, get) {
+    // Create the subnet 2001:db8::/48 #111 in shared network foo.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xnetwork = xpath + "/shared-network[name='foo']";
+    const string& xsubnet = xnetwork + "/subnet6[id='111']/subnet";
+    string const v_subnet("2001:db8::/48");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet, v_subnet));
+    sess_->applyChanges();
+
+    // Get the shared network.
+    ConstElementPtr network;
+    EXPECT_NO_THROW_LOG(network = translator_->getSharedNetworkFromAbsoluteXpath(xnetwork));
+    ASSERT_TRUE(network);
+    ElementPtr subnet = Element::createMap();
+    subnet->set("id", Element::create(111));
+    subnet->set("subnet", Element::create("2001:db8::/48"));
+    ElementPtr subnets = Element::createList();
+    subnets->add(subnet);
+    ElementPtr expected = Element::createMap();
+    expected->set("name", Element::create("foo"));
+    expected->set("subnet6", subnets);
+    EXPECT_TRUE(expected->equals(*network));
+
+    // Get the shared network list and check if the shared network is in it.
+    ConstElementPtr networks;
+    EXPECT_NO_THROW_LOG(networks = translator_->getSharedNetworksFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(networks);
+    ASSERT_EQ(Element::list, networks->getType());
+    ASSERT_EQ(1, networks->size());
+    EXPECT_TRUE(network->equals(*networks->get(0)));
+}
+
+// This test verifies that an empty shared network list can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorSharedNetworksTestKeaV4, setEmpty) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ConstElementPtr networks = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setSharedNetworks(xpath, networks));
+
+    // Get it back.
+    networks.reset();
+    EXPECT_NO_THROW_LOG(networks = translator_->getSharedNetworksFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(networks);
+}
+
+// This test verifies that one shared network can be properly
+// translated from JSON to YANG.
+TEST_F(TranslatorSharedNetworksTestKeaV6, set) {
+    // Set one shared network.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ElementPtr networks = Element::createList();
+    ElementPtr share = Element::createMap();
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create("2001:db8::/48"));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    share->set("name", Element::create("foo"));
+    share->set("subnet6", subnets);
+    networks->add(share);
+    EXPECT_NO_THROW_LOG(translator_->setSharedNetworks(xpath, networks));
+
+    // Get it back.
+    networks.reset();
+    EXPECT_NO_THROW_LOG(networks = translator_->getSharedNetworksFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(networks);
+    ASSERT_EQ(Element::list, networks->getType());
+    ASSERT_EQ(1, networks->size());
+    EXPECT_TRUE(share->equals(*networks->get(0)));
+}
+
+// This test verifies that several shared networks can be properly
+// translated from YANG to JSON. This test adds the following structure:
+//
+// shared-network "foo":
+//   - subnet1: 2001:db8:1::/48 (subnet-id 1)
+//   - subnet1: 2001:db8:2::/48 (subnet-id 2)
+// shared-network "bar":
+//   - subnet1: 2001:db8:101::/48 (subnet-id 101)
+//   - subnet1: 2001:db8:102::/48 (subnet-id 102)
+TEST_F(TranslatorSharedNetworksTestKeaV6, getList) {
+    const string& xpath = "/kea-dhcp6-server:config";
+
+    // Those two networks will be added.
+    const string& xnetwork1 = xpath + "/shared-network[name='foo']";
+    const string& xnetwork2 = xpath + "/shared-network[name='bar']";
+
+    // Non-existent network
+    const string& xnetwork3 = xpath + "/shared-network[name='baz']";
+
+    const string& exp_net1 =
+        "{ \"name\": \"foo\", \"subnet6\": [ { \"id\": 1, "
+        "\"subnet\": \"2001:db8:1::/48\" }, "
+        "{ \"id\": 2, \"subnet\": \"2001:db8:2::/48\" } ] }";
+
+    const string& exp_net2 =
+        "{ \"name\": \"bar\", \"subnet6\": [ { \"id\": 101, "
+        "\"subnet\": \"2001:db8:101::/48\" }, "
+        "{ \"id\": 102, \"subnet\": \"2001:db8:102::/48\" } ] }";
+
+    const string exp_both =
+        "[ " + exp_net1 + ", " + exp_net2 + " ]";
+
+    // Create the subnet1: 2001:db8:1::/48 #1 in shared network foo.
+    const string& xsubnet1 = xnetwork1 + "/subnet6[id='1']/subnet";
+    string const v_subnet1("2001:db8:1::/48");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet1, v_subnet1));
+    sess_->applyChanges();
+
+    // Create the subnet2: 2001:db8:2::/48 #2 in shared network foo.
+    const string& xsubnet2 = xnetwork1 + "/subnet6[id='2']/subnet";
+    string const v_subnet2("2001:db8:2::/48");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet2, v_subnet2));
+    sess_->applyChanges();
+
+    // Create the subnet1: 2001:db8:101::/48 #101 in shared network foo.
+    const string& xsubnet3 = xnetwork2 + "/subnet6[id='101']/subnet";
+    string const v_subnet("2001:db8:101::/48");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet3, v_subnet));
+    sess_->applyChanges();
+
+    // Create the subnet2: 2001:db8:2::/48 #2 in shared network foo.
+    const string& xsubnet4 = xnetwork2 + "/subnet6[id='102']/subnet";
+    string const v_subnet4("2001:db8:102::/48");
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet4, v_subnet4));
+    sess_->applyChanges();
+
+    // Ok, now test the getters. Let's start with the easier ones that
+    // return a single network.
+    ConstElementPtr network;
+
+    // Get the first network.
+    EXPECT_NO_THROW_LOG(network = translator_->getSharedNetworkFromAbsoluteXpath(xnetwork1));
+    ASSERT_TRUE(network);
+    EXPECT_EQ(exp_net1, network->str());
+
+    // Get the second network.
+    EXPECT_NO_THROW_LOG(network = translator_->getSharedNetworkFromAbsoluteXpath(xnetwork2));
+    ASSERT_TRUE(network);
+    EXPECT_EQ(exp_net2, network->str());
+
+    // Check that networks with non-existent name are not returned.
+    EXPECT_NO_THROW_LOG(network = translator_->getSharedNetworkFromAbsoluteXpath(xnetwork3));
+    EXPECT_FALSE(network);
+
+    // Now test returns all networks
+    ConstElementPtr networks;
+    EXPECT_NO_THROW_LOG(networks = translator_->getSharedNetworksFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(networks);
+    EXPECT_EQ(exp_both, networks->str());
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_subnet_unittests.cc b/src/lib/yang/tests/translator_subnet_unittests.cc
new file mode 100644
index 0000000..d9a8104
--- /dev/null
+++ b/src/lib/yang/tests/translator_subnet_unittests.cc
@@ -0,0 +1,379 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator_subnet.h>
+#include <yang/yang_models.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace sysrepo;
+
+namespace {
+
+/// @brief Translator name.
+extern char const subnet_list[] = "subnet list";
+
+/// @brief Test fixture class for @ref TranslatorSubnets.
+class TranslatorSubnetsTestKeaV4 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+    /// @brief Constructor
+    TranslatorSubnetsTestKeaV4() {
+        model_ = KEA_DHCP4_SERVER;
+    }
+};  // TranslatorSubnetsTestKeaV4
+
+class TranslatorSubnetsTestKeaV6 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+    /// @brief Constructor
+    TranslatorSubnetsTestKeaV6() {
+        model_ = KEA_DHCP6_SERVER;
+    }
+};  // TranslatorSubnetsTestKeaV6
+
+class TranslatorSubnetsTestIetfV6 :
+    public GenericTranslatorTest<subnet_list, TranslatorSubnets> {
+public:
+    /// @brief Constructor
+    TranslatorSubnetsTestIetfV6() {
+        model_ = IETF_DHCPV6_SERVER;
+    }
+};  // TranslatorSubnetsTestIetfV6
+
+// This test verifies that an empty subnet list can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getEmptyIetf) {
+    // Get the subnet list and check if it is empty.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getEmptyKea) {
+    // Get the subnet list and check if it is empty.
+    const string& xpath = "/kea-dhcp6-server:config";
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that one subnet can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    const string& xsub = xpath + "/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& xsubnet = xsub + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet, v_subnet));
+    sess_->applyChanges();
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW_LOG(subnet = translator_->getSubnetFromAbsoluteXpath(xsub));
+    ASSERT_TRUE(subnet);
+    EXPECT_EQ("{ \"id\": 111, "
+              "\"subnet\": \"2001:db8::/48\" }",
+              subnet->str());
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    ASSERT_TRUE(subnets->get(0));
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xsub = xpath + "/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& xsubnet = xsub + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet, v_subnet));
+    sess_->applyChanges();
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW_LOG(subnet = translator_->getSubnetFromAbsoluteXpath(xsub));
+    ASSERT_TRUE(subnet);
+    ElementPtr expected = Element::createMap();
+    expected->set("id", Element::create(111));
+    expected->set("subnet", Element::create("2001:db8::/48"));
+    EXPECT_TRUE(expected->equals(*subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from YANG to JSON using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, getPoolsIetf) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    const string& xsub = xpath + "/network-range[network-range-id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& xsubnet = xsub + "/network-prefix";
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::1:0/112 #1.
+    const string& xpool = xsub + "/address-pools";
+    const string& prefix1 = xpool + "/address-pool[pool-id='1']/pool-prefix";
+    string const s_pool1("2001:db8::1:0/112");
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix1, s_pool1));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::2:0/112 #2.
+    const string& prefix2 = xpool + "/address-pool[pool-id='2']/pool-prefix";
+    string const s_pool2("2001:db8::2:0/112");
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix2, s_pool2));
+    sess_->applyChanges();
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW_LOG(subnet = translator_->getSubnetFromAbsoluteXpath(xsub));
+    ASSERT_TRUE(subnet);
+    string expected =
+        "{\n"
+        "  \"id\": 111,\n"
+        "  \"pools\": [\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::1:0/112\"\n"
+        "    },\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::2:0/112\"\n"
+        "    }\n"
+        "  ],\n"
+        "  \"subnet\": \"2001:db8::/48\"\n"
+        "}";
+    EXPECT_EQ(expected, prettyPrint(subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from YANG to JSON using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV6, getPoolsKea) {
+    // Create the subnet 2001:db8::/48 #111.
+    const string& xpath = "/kea-dhcp6-server:config";
+    const string& xsub = xpath + "/subnet6[id='111']";
+    string const v_subnet("2001:db8::/48");
+    const string& xsubnet = xsub + "/subnet";
+    EXPECT_NO_THROW_LOG(sess_->setItem(xsubnet, v_subnet));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::1:0/112.
+    const string& prefix1 = xsub + "/pool[start-address='2001:db8::1:0']" +
+        "[end-address='2001:db8::1:ffff']/prefix";
+    string const s_pool1("2001:db8::1:0/112");
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix1, s_pool1));
+    sess_->applyChanges();
+
+    // Create the pool 2001:db8::2:0/112.
+    const string& prefix2 = xsub + "/pool[start-address='2001:db8::2:0']" +
+        "[end-address='2001:db8::2:ffff']";
+    EXPECT_NO_THROW_LOG(sess_->setItem(prefix2, nullopt));
+    sess_->applyChanges();
+
+    // Get the subnet.
+    ConstElementPtr subnet;
+    EXPECT_NO_THROW_LOG(subnet = translator_->getSubnetFromAbsoluteXpath(xsub));
+    ASSERT_TRUE(subnet);
+    string expected =
+        "{\n"
+        "  \"id\": 111,\n"
+        "  \"pools\": [\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::1:0/112\"\n"
+        "    },\n"
+        "    {\n"
+        "      \"pool\": \"2001:db8::2:0 - 2001:db8::2:ffff\"\n"
+        "    }\n"
+        "  ],\n"
+        "  \"subnet\": \"2001:db8::/48\"\n"
+        "}";
+    EXPECT_EQ(expected, prettyPrint(subnet));
+
+    // Get the subnet list and check if the subnet is in it.
+    ConstElementPtr subnets;
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setEmptyIetf) {
+    // Set empty list.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ConstElementPtr subnets = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that an empty subnet list can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setEmptyKea) {
+    // Set empty list.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_FALSE(subnets);
+}
+
+// This test verifies that one subnet can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setIetf) {
+    // Set one subnet.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create("2001:db8::/48"));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setKea) {
+    // Set one subnet.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create("10.0.1.0/24"));
+    subnet->set("id", Element::create(123));
+    subnets->add(subnet);
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from JSON to YANG using IETF model.
+TEST_F(TranslatorSubnetsTestIetfV6, setTwoIetf) {
+    // Set one subnet.
+    const string& xpath =
+        "/ietf-dhcpv6-server:server/server-config/network-ranges";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create("2001:db8::/48"));
+    subnet->set("id", Element::create(123));
+
+    // Add two pools.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool1 = Element::createMap();
+    pool1->set("pool", Element::create("2001:db8::1:0/112"));
+    pools->add(pool1);
+    ElementPtr pool2 = Element::createMap();
+    pool2->set("pool", Element::create("2001:db8::2:0/112"));
+    pools->add(pool2);
+    subnet->set("pools", pools);
+
+    // Add the subnet.
+    subnets->add(subnet);
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+// This test verifies that one subnet with two pools can be properly
+// translated from JSON to YANG using Kea ad hoc model.
+TEST_F(TranslatorSubnetsTestKeaV4, setTwoKea) {
+    // Set one subnet.
+    const string& xpath = "/kea-dhcp4-server:config";
+    ElementPtr subnets = Element::createList();
+    ElementPtr subnet = Element::createMap();
+    subnet->set("subnet", Element::create("10.0.1.0/24"));
+    subnet->set("id", Element::create(123));
+
+    // Add two pools.
+    ElementPtr pools = Element::createList();
+    ElementPtr pool1 = Element::createMap();
+    pool1->set("pool", Element::create("10.0.1.0/28"));
+    pools->add(pool1);
+    ElementPtr pool2 = Element::createMap();
+    pool2->set("pool", Element::create("10.0.1.200 - 10.0.1.222"));
+    pools->add(pool2);
+    subnet->set("pools", pools);
+
+    // Add the subnet.
+    subnets->add(subnet);
+    EXPECT_NO_THROW_LOG(translator_->setSubnets(xpath, subnets));
+
+    // Get it back.
+    subnets.reset();
+    EXPECT_NO_THROW_LOG(subnets = translator_->getSubnetsFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(subnets);
+    ASSERT_EQ(Element::list, subnets->getType());
+    ASSERT_EQ(1, subnets->size());
+    EXPECT_TRUE(subnet->equals(*subnets->get(0)));
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/translator_unittests.cc b/src/lib/yang/tests/translator_unittests.cc
new file mode 100644
index 0000000..8532419
--- /dev/null
+++ b/src/lib/yang/tests/translator_unittests.cc
@@ -0,0 +1,892 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/translator.h>
+
+using namespace std;
+using namespace isc;
+using namespace isc::data;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace libyang;
+using namespace sysrepo;
+
+struct TranslatorTest : ::testing::Test {
+    void SetUp() override {
+        SysrepoSetup::cleanSharedMemory();
+        cleanUp();
+    }
+
+    void TearDown() override {
+        cleanUp();
+        SysrepoSetup::cleanSharedMemory();
+    }
+
+private:
+    void cleanUp() {
+        Session session(sysrepo::Connection{}.sessionStart());
+        session.switchDatastore(sysrepo::Datastore::Candidate);
+        session.deleteItem("/keatest-module:container");
+        session.deleteItem("/keatest-module:kernel-modules");
+        session.deleteItem("/keatest-module:list");
+        session.deleteItem("/keatest-module:main");
+        session.deleteItem("/keatest-module:presence-container");
+        session.applyChanges();
+    }
+};  // TranslatorTest
+
+namespace {
+
+// Test constructor.
+TEST_F(TranslatorTest, constructor) {
+    // Get a session.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+    // Get a translator object.
+    unique_ptr<Translator> translator;
+    EXPECT_NO_THROW_LOG(translator.reset(new Translator(sess, "")));
+}
+
+// Test basic YANG to JSON value conversion using sysrepo test models.
+TEST_F(TranslatorTest, getItem) {
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+    unique_ptr<Translator> translator;
+    ASSERT_NO_THROW_LOG(translator.reset(new Translator(sess, "")));
+    string value;
+    ConstElementPtr element;
+    string xpath;
+
+    // String.
+    xpath = "/keatest-module:main/string";
+    value = "str";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ("str", element->stringValue());
+    element.reset();
+
+    // Bool.
+    xpath = "/keatest-module:main/boolean";
+    value = "true";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::boolean, element->getType());
+    EXPECT_TRUE(element->boolValue());
+    element.reset();
+
+    // Unsigned 8 bit integer.
+    xpath = "/keatest-module:main/ui8";
+    uint8_t u8(8);
+    value = to_string(u8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(8, element->intValue());
+    element.reset();
+
+    // Unsigned 16 bit integer.
+    xpath = "/keatest-module:main/ui16";
+    uint16_t u16(16);
+    value = to_string(u16);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(16, element->intValue());
+    element.reset();
+
+    // Unsigned 32 bit integer.
+    xpath = "/keatest-module:main/ui32";
+    uint32_t u32(32);
+    value = to_string(u32);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(32, element->intValue());
+    element.reset();
+
+    // Unsigned 64 bit integer.
+    xpath = "/keatest-module:main/ui64";
+    uint64_t u64(64);
+    value = to_string(u64);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(64, element->intValue());
+    element.reset();
+
+    // Empty.
+    xpath = "/keatest-module:main/empty";
+    value = string();
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(string(), element->stringValue());
+    element.reset();
+
+    // Signed 8 bit integer.
+    xpath = "/keatest-module:main/i8";
+    int8_t s8(8);
+    value = to_string(s8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(8, element->intValue());
+    element.reset();
+
+    // Signed 16 bit integer.
+    xpath = "/keatest-module:main/i16";
+    int16_t s16(16);
+    value = to_string(s16);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(16, element->intValue());
+    element.reset();
+
+    // Signed 32 bit integer.
+    xpath = "/keatest-module:main/i32";
+    int32_t s32(32);
+    value = to_string(s32);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(32, element->intValue());
+    element.reset();
+
+    // Signed 64 bit integer.
+    xpath = "/keatest-module:main/i64";
+    int64_t s64(64);
+    value = to_string(s64);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::integer, element->getType());
+    EXPECT_EQ(64, element->intValue());
+    element.reset();
+
+    // Identity reference.
+    xpath = "/keatest-module:main/id_ref";
+    value = "keatest-module:id_1";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ("keatest-module:id_1", element->stringValue());
+    element.reset();
+
+    // Enumeration item.
+    xpath = "/keatest-module:main/enum";
+    value = "maybe";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ("maybe", element->stringValue());
+    element.reset();
+
+    // Bits.
+    xpath = "/keatest-module:main/options";
+    value = "strict recursive logging";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ("strict recursive logging", element->stringValue());
+    element.reset();
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    value = "Zm9vYmFy";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ("foobar", element->stringValue());
+    element.reset();
+
+    // Leaf-list: not yet exist.
+    xpath = "/keatest-module:main/numbers";
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(element);
+    element.reset();
+
+    // No easy way to create it empty.
+
+    // Leaf-list: 1, 2 and 3.
+    u8 = 1;
+    value = to_string(u8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    u8 = 2;
+    value = to_string(u8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    u8 = 3;
+    value = to_string(u8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::list, element->getType());
+    EXPECT_EQ(3, element->size());
+    EXPECT_EQ("[ 1, 2, 3 ]", element->str());
+    element.reset();
+
+    // Instance identifier.
+    xpath = "/keatest-module:main/instance_id";
+    value = "/keatest-module:main/numbers[.='1']";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+
+    // Union.
+    xpath = "/keatest-module:main/union";
+    value = "8";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+    value = "infinity";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-i8";
+    value = "9";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-raw";
+    value = "ff012345";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-string";
+    value = "string through leafref";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::string, element->getType());
+    EXPECT_EQ(value, element->stringValue());
+    element.reset();
+
+    // Decimal 64.
+    xpath = "/keatest-module:main/dec64";
+    value = to_string(9.85);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    sess.applyChanges();
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_TRUE(element);
+    ASSERT_EQ(Element::real, element->getType());
+    EXPECT_EQ("9.85", element->str());
+    element.reset();
+
+    // Not existing.
+    xpath = "/keatest-module:main/no_such_node";
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(element);
+    element.reset();
+
+    // Check error.
+    xpath = "null";
+    EXPECT_NO_THROW_LOG(element = translator->getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(element);
+}
+
+// Check the Translator::deleteItem function.
+TEST_F(TranslatorTest, deleteItem) {
+    ElementPtr got;
+    string xpath;
+
+    // Get a translator object to play with.
+    Translator translator(Connection{}.sessionStart(), "keatest-module");
+
+    // Missing schema node
+    EXPECT_NO_THROW_LOG(translator.deleteItem("/keatest-module:main/no_such_node"));
+
+    // Existing schema node, but no data
+    xpath = "/keatest-module:main/string";
+    EXPECT_NO_THROW_LOG(translator.deleteItem(xpath));
+    EXPECT_NO_THROW_LOG(got = translator.getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(got);
+    got.reset();
+
+    // Existing schema node, existing data
+    translator.setItem(xpath, Element::create("value"), LeafBaseType::String);
+    EXPECT_NO_THROW_LOG(translator.deleteItem(xpath));
+    EXPECT_NO_THROW_LOG(got = translator.getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(got);
+    got.reset();
+
+    // Container schema node, no data
+    EXPECT_NO_THROW_LOG(translator.deleteItem("/keatest-module:main"));
+    EXPECT_NO_THROW_LOG(got = translator.getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(got);
+    got.reset();
+
+    // Container schema node, existing data
+    translator.setItem(xpath, Element::create("value"), LeafBaseType::String);
+    EXPECT_NO_THROW_LOG(translator.deleteItem("/keatest-module:main"));
+    EXPECT_NO_THROW_LOG(got = translator.getItemFromAbsoluteXpath(xpath));
+    EXPECT_FALSE(got);
+    got.reset();
+}
+
+// Test JSON to basic YANG value conversion using the static method.
+TEST_F(TranslatorTest, valueTo) {
+    optional<string> value;
+
+    // Null.
+    ConstElementPtr element;
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::String));
+    EXPECT_EQ(nullopt, value);
+    EXPECT_FALSE(element);
+
+    // Container.
+    element = Element::createMap();
+    EXPECT_THROW_MSG(Translator::translateToYang(element, LeafBaseType::Unknown), NotImplemented,
+                     "Translator::value(): map element");
+
+    // List.
+    element = Element::createList();
+    EXPECT_THROW_MSG(Translator::translateToYang(element, LeafBaseType::Unknown), NotImplemented,
+                     "Translator::value(): list element");
+
+    // String.
+    string str("foo");
+    element = Element::create(str);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::String));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Bool.
+    element = Element::create(false);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Bool));
+    EXPECT_EQ(element->str(), value);
+
+    // Unsigned 8 bit integer.
+    element = Element::create(123);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Uint8));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Unsigned 16 bit integer.
+    element = Element::create(12345);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Uint16));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Unsigned 32 bit integer.
+    element = Element::create(123456789);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Uint32));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Unsigned 64 bit integer.
+    element = Element::create(int64_t(1234567890123456));
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Uint64));
+    EXPECT_EQ("1234567890123456", value);
+    element.reset();
+
+    // Signed 8 bit integer.
+    element = Element::create(-123);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Int8));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Signed 16 bit integer.
+    element = Element::create(-12345);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Int16));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Signed 32 bit integer.
+    element = Element::create(-123456789);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Int32));
+    EXPECT_EQ(element->str(), value);
+    element.reset();
+
+    // Signed 64 bit integer.
+    element = Element::create(int64_t(-1234567890123456));
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Int64));
+    EXPECT_EQ("-1234567890123456", value);
+    element.reset();
+
+    // Identity reference.
+    element = Element::create(str);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::IdentityRef));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Enumeration item.
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Enum));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Binary.
+    element = Element::create("foobar");
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Binary));
+    EXPECT_EQ("Zm9vYmFy", value);
+
+    // Bits.
+    element = Element::create("foobar");
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Bits));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Decimal 64.
+    double d64(.1234);
+    element = Element::create(d64);
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Dec64));
+    EXPECT_EQ(element->str(), value);
+
+    // Empty.
+    element = Element::create(string());
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Empty));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Leafref.
+    element = Element::create("leafref");
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Leafref));
+    EXPECT_EQ(element->stringValue(), value);
+
+    // Union.
+    element = Element::create("union");
+    EXPECT_NO_THROW_LOG(value = Translator::translateToYang(element, LeafBaseType::Union));
+    EXPECT_EQ(element->stringValue(), value);
+}
+
+// Test JSON to basic YANG value conversion using sysrepo test models.
+TEST_F(TranslatorTest, setItem) {
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+    unique_ptr<Translator> translator;
+    ASSERT_NO_THROW_LOG(translator.reset(new Translator(sess, "keatest-module")));
+
+    ElementPtr element;
+    string xpath;
+
+    // String.
+    optional<DataNode> data_node;
+    xpath = "/keatest-module:main/string";
+    element = Element::create("str");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::String));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::String, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Bool.
+    xpath = "/keatest-module:main/boolean";
+    element = Element::create(true);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Bool));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Bool, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Unsigned 8 bit integer.
+    xpath = "/keatest-module:main/ui8";
+    element = Element::create(8);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Uint8));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Uint8, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Unsigned 16 bit integer.
+    xpath = "/keatest-module:main/ui16";
+    element = Element::create(16);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Uint16));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Uint16, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Unsigned 32 bit integer.
+    xpath = "/keatest-module:main/ui32";
+    element = Element::create(32);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Uint32));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Uint32, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Unsigned 64 bit integer.
+    xpath = "/keatest-module:main/ui64";
+    element = Element::create(64);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Uint64));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Uint64, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Empty.
+    xpath = "/keatest-module:main/empty";
+    element = Element::create(string());
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Empty));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Empty, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Signed 8 bit integer.
+    xpath = "/keatest-module:main/i8";
+    element = Element::create(8);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Int8));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Int8, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Signed 16 bit integer.
+    xpath = "/keatest-module:main/i16";
+    element = Element::create(16);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Int16));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Int16, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Signed 32 bit integer.
+    xpath = "/keatest-module:main/i32";
+    element = Element::create(32);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Int32));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Int32, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Signed 64 bit integer.
+    xpath = "/keatest-module:main/i64";
+    element = Element::create(64);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Int64));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Int64, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Identity reference.
+    xpath = "/keatest-module:main/id_ref";
+    element = Element::create("keatest-module:id_1");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::IdentityRef));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::IdentityRef, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Enumeration item.
+    xpath = "/keatest-module:main/enum";
+    element = Element::create("maybe");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Enum));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Enum, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    element = Element::create("foobar");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Binary));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Binary, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ("Zm9vYmFy", string(data_node->asTerm().valueStr()));
+
+    // Bits.
+    xpath = "/keatest-module:main/options";
+    element = Element::create("strict recursive logging");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Bits));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Bits, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Decimal 64.
+    xpath = "/keatest-module:main/dec64";
+    double d64(9.85);
+    element = Element::create(d64);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Dec64));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Dec64, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->str(), string(data_node->asTerm().valueStr()));
+
+    // Leaf-list.
+    xpath = "/keatest-module:main/numbers";
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, Element::fromJSON("1"), LeafBaseType::Uint8));
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, Element::fromJSON("2"), LeafBaseType::Uint8));
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, Element::fromJSON("3"), LeafBaseType::Uint8));
+    ElementPtr got(translator->getItemFromAbsoluteXpath(xpath));
+    ASSERT_EQ(LeafBaseType::Dec64, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ("[ 1, 2, 3 ]", got->str());
+
+    // Clean the leaf-list.
+    EXPECT_NO_THROW_LOG(translator->deleteItem(xpath));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    EXPECT_FALSE(data_node);
+    data_node.reset();
+
+    // Instance identifier.
+    xpath = "/keatest-module:main/instance_id";
+    element = Element::create("/keatest-module:main/numbers[.='1']");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::InstanceIdentifier));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::InstanceIdentifier, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Union.
+    xpath = "/keatest-module:main/union";
+    element = Element::create("8");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Union));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Union, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+    element = Element::create("infinity");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Union));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Union, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-i8";
+    element = Element::create("9");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Leafref));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Leafref, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-raw";
+    element = Element::create("ff012345");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Leafref));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Leafref, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Leafref.
+    xpath = "/keatest-module:main/leafref-string";
+    element = Element::create("string through");
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Leafref));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    ASSERT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    ASSERT_TRUE(data_node);
+    ASSERT_EQ(LeafBaseType::Leafref, data_node->schema().asLeaf().valueType().base());
+    EXPECT_EQ(element->stringValue(), string(data_node->asTerm().valueStr()));
+
+    // Bad xpath.
+    xpath = "/keatest-module:main/no_such_node";
+    element = Element::create("str");
+    EXPECT_THROW_MSG(translator->setItem(xpath, element, LeafBaseType::String), NetconfError,
+                     "setting item '\"str\"' at '" + xpath +
+                     "': Session::setItem: Couldn't set "
+                     "'/keatest-module:main/no_such_node' to 'str': SR_ERR_INVAL_ARG");
+
+    // Bad type.
+    xpath = "/keatest-module:main/string";
+    element = Element::create(true);
+    EXPECT_NO_THROW_LOG(translator->setItem(xpath, element, LeafBaseType::Bool));
+
+    element = translator->getItemFromAbsoluteXpath(xpath);
+    ASSERT_TRUE(element);
+    EXPECT_EQ(element->getType(), Element::string);
+    EXPECT_EQ(element->str(), "\"true\"");
+
+    // Delete (twice).
+    xpath = "/keatest-module:main/string";
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    EXPECT_TRUE(data_node);
+    EXPECT_NO_THROW_LOG(data_node = data_node->findPath(xpath));
+    EXPECT_TRUE(data_node);
+    ASSERT_TRUE(NodeType::Leaf == data_node->schema().nodeType());
+    EXPECT_EQ("true", data_node->asTerm().valueStr());
+    EXPECT_NO_THROW_LOG(translator->deleteItem(xpath));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    EXPECT_FALSE(data_node);
+    EXPECT_NO_THROW_LOG(translator->deleteItem(xpath));
+    EXPECT_NO_THROW_LOG(data_node = sess.getData(xpath));
+    EXPECT_FALSE(data_node);
+}
+
+// Test YANG container retrieval.
+TEST_F(TranslatorTest, container) {
+    ElementPtr element;
+
+    // Get a translator object to play with.
+    Translator translator(Connection{}.sessionStart(), "keatest-module");
+
+    // Container with no data apparently throws.
+    EXPECT_THROW_MSG(element = translator.getItemFromAbsoluteXpath("/keatest-module:container"), NotImplemented,
+                     "getting node of type 1 not supported, xpath is '/keatest-module:container'");
+    EXPECT_FALSE(element);
+    element.reset();
+
+    EXPECT_NO_THROW_LOG(
+        translator.setItem("/keatest-module:container",
+                           ElementPtr(), LeafBaseType::Unknown));
+
+    // Container with data filled in throws when retrieving the container itself.
+    element = Element::create("Leaf value");
+    EXPECT_NO_THROW_LOG(
+        translator.setItem("/keatest-module:container/list[key1='key1'][key2='key2']/leaf",
+                           element, LeafBaseType::String));
+    element.reset();
+    EXPECT_THROW_MSG(
+        element = translator.getItemFromAbsoluteXpath("/keatest-module:container"), NotImplemented,
+        "getting node of type 1 not supported, xpath is '/keatest-module:container'");
+    EXPECT_FALSE(element);
+    element.reset();
+    EXPECT_NO_THROW_LOG(
+        element = translator.getItemFromAbsoluteXpath("/keatest-module:container[key1='key1'][key2='key2']"));
+    EXPECT_FALSE(element);
+}
+
+// Test YANG list retrieval.
+TEST_F(TranslatorTest, list) {
+    ElementPtr element;
+
+    // Get a translator to play with.
+    Translator translator(Connection{}.sessionStart(), "keatest-module");
+
+    // List with no data does not throw and returns a null ElementPtr by default.
+    EXPECT_NO_THROW_LOG(
+        element = translator.getItemFromAbsoluteXpath("/keatest-module:container/list"));
+    EXPECT_FALSE(element);
+    element.reset();
+
+    // List with data filled in throws when retrieving the list itself.
+    element = Element::create("Leaf value");
+    EXPECT_NO_THROW_LOG(
+        translator.setItem("/keatest-module:container/list[key1='key1'][key2='key2']/leaf", element,
+                           LeafBaseType::String));
+    element.reset();
+    EXPECT_THROW_MSG(
+        element = translator.getItemFromAbsoluteXpath("/keatest-module:container/list"), NotImplemented,
+        "getting node of type 16 not supported, xpath is '/keatest-module:container/list'");
+    EXPECT_FALSE(element);
+    element.reset();
+    EXPECT_THROW_MSG(element = translator.getItemFromAbsoluteXpath(
+                         "/keatest-module:container/list[key1='key1'][key2='key2']"), NotImplemented,
+                     "getting node of type 16 not supported, xpath is "
+                     "'/keatest-module:container/list[key1='key1'][key2='key2']'");
+    EXPECT_FALSE(element);
+}
+
+// Test that we can check if a schema node exists.
+TEST_F(TranslatorTest, schemaNodeExists) {
+    // Get a translator to play with.
+    Translator translator(Connection{}.sessionStart(), "keatest-module");
+
+    EXPECT_FALSE(translator.schemaNodeExists("/keatest-module:main/no_such_node"));
+    EXPECT_TRUE(translator.schemaNodeExists("/keatest-module:main"));
+    EXPECT_TRUE(translator.schemaNodeExists("/keatest-module:main/string"));
+    EXPECT_TRUE(translator.schemaNodeExists("/keatest-module:container/list"));
+}
+
+}  // anonymous namespace
diff --git a/src/lib/yang/tests/translator_utils_unittests.cc b/src/lib/yang/tests/translator_utils_unittests.cc
new file mode 100644
index 0000000..ddd4cb9
--- /dev/null
+++ b/src/lib/yang/tests/translator_utils_unittests.cc
@@ -0,0 +1,288 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+#include <testutils/gtest_utils.h>
+#include <yang/testutils/translator_test.h>
+#include <yang/tests/sysrepo_setup.h>
+#include <yang/tests/yang_configs.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::yang;
+using namespace isc::yang::test;
+using namespace libyang;
+using namespace sysrepo;
+
+namespace {
+
+// Test LeafBaseType print.
+TEST(YangReprTest, type) {
+    ostringstream os;
+
+    // Verify that string is "string" (vs a number).
+    LeafBaseType t(LeafBaseType::String);
+    os << t;
+    EXPECT_EQ("string", os.str());
+    os.str("");
+
+    // Compiler does not let to create an invalid value...
+}
+
+// Test YangReprItem basic stuff.
+TEST(YangReprTest, item) {
+    // An item.
+    YRItem item1("/foo", "bar", LeafBaseType::String, true);
+    EXPECT_EQ("/foo", item1.xpath_);
+    EXPECT_EQ("bar", item1.value_);
+    EXPECT_TRUE(item1.settable_);
+
+    // EXPECT_EQ doesn't work. Tries to << into a stringstream.
+    EXPECT_TRUE(LeafBaseType::String == item1.type_);
+
+    // Another one.
+    YRItem item2("/foo", "bar", LeafBaseType::String, false);
+    EXPECT_EQ("/foo", item2.xpath_);
+    EXPECT_EQ("bar", item2.value_);
+    EXPECT_FALSE(item2.settable_);
+
+    // EXPECT_EQ doesn't work. Tries to << into a stringstream.
+    EXPECT_TRUE(LeafBaseType::String == item2.type_);
+
+    // Equality.
+    EXPECT_TRUE(item1 == item2);
+    EXPECT_TRUE(item2 == item1);
+    EXPECT_FALSE(item1 != item2);
+    EXPECT_FALSE(item2 != item1);
+    EXPECT_EQ(item1, item2);
+    EXPECT_EQ(item2, item1);
+}
+
+// Test get with test module.
+TEST(YangReprTest, getTest) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+
+    // Cleanup.
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:container"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:main"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    // Fill the test module.
+    string xpath;
+    string value;
+
+    xpath = "/keatest-module:main/string";
+    value = "str";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/boolean";
+    value = "true";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/ui8";
+    uint8_t u8(8);
+    value = to_string(u8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/ui16";
+    uint16_t u16(16);
+    value = to_string(u16);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/ui32";
+    uint32_t u32(32);
+    value = to_string(u32);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/ui64";
+    uint64_t u64(64);
+    value = to_string(u64);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/i8";
+    int8_t s8(8);
+    value = to_string(s8);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/i16";
+    int16_t s16(16);
+    value = to_string(s16);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/i32";
+    int32_t s32(32);
+    value = to_string(s32);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/i64";
+    int64_t s64(64);
+    value = to_string(s64);
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/id_ref";
+    value = "keatest-module:id_1";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    xpath = "/keatest-module:main/enum";
+    value = "maybe";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    // Binary.
+    xpath = "/keatest-module:main/raw";
+    value = "Zm9vYmFy";
+    EXPECT_NO_THROW_LOG(sess.setItem(xpath, value));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    // Get it.
+    YangRepr repr(testModel);
+    YRTree tree;
+    EXPECT_NO_THROW_LOG(tree = repr.get(sess));
+
+    // Verify.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+}
+
+// This test verifies that errors are handled properly.
+TEST(YangReprTrest, getTestErrors) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+
+    // Cleanup.
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:container"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:main"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    // Get it.
+    YangRepr repr(testModel);
+    YRTree tree;
+    EXPECT_NO_THROW_LOG(repr.set(testTree, sess));
+
+    // Verify.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+
+    // Change a path. Remove final 'm'.
+    YRTree badpath = testTree;
+    string xpath("/keatest-module:main/enum");
+    YRItem node(badpath.at(xpath));
+    node.xpath_ = "/keatest-module:main/enu";
+    badpath.erase(xpath);
+    badpath.emplace(xpath, node);
+    EXPECT_FALSE(repr.verify(badpath, sess, cerr));
+
+    // Change a value from "str" to "Str".
+    YRTree badvalue = testTree;
+    xpath = "/keatest-module:main/string";
+    badvalue.at(xpath).value_ = "Str";
+    EXPECT_FALSE(repr.verify(badvalue, sess, cerr));
+
+    // Change a type from LeafBaseType::Int32 to LeafBaseType::Uint32.
+    YRTree badtype = testTree;
+    xpath = "/keatest-module:main/i32";
+    badtype.at(xpath).type_ = LeafBaseType::Uint32;
+    EXPECT_FALSE(repr.verify(badtype, sess, cerr));
+
+    // Delete last record.
+    YRTree badextra = testTree;
+    badextra.erase("/keatest-module:kernel-modules");
+    EXPECT_FALSE(repr.verify(badextra, sess, cerr));
+}
+
+// Test set with test module.
+TEST(YangReprTest, setTest) {
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+
+    // Cleanup.
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:container"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+    EXPECT_NO_THROW_LOG(sess.deleteItem("/keatest-module:main"));
+    EXPECT_NO_THROW_LOG(sess.applyChanges());
+
+    // Set the module content.
+    YangRepr repr(testModel);
+    EXPECT_NO_THROW_LOG(repr.set(testTree, sess));
+
+    // Verify it.
+    EXPECT_TRUE(repr.verify(testTree, sess, cerr));
+}
+
+/// @brief Tests specified configuration.
+///
+/// Configuration is set and then verified using YangRepr object.
+///
+/// @param model name of the model to be verified against.
+/// @param tree tree to be verified.
+void sanityCheckConfig(const string& model, const YRTree& tree) {
+    SCOPED_TRACE("\n* Tested model: " + model);
+    SysrepoSetup::cleanSharedMemory();
+
+    // Get a translator object to play with.
+    Session sess(Connection{}.sessionStart());
+    sess.switchDatastore(sysrepo::Datastore::Candidate);
+
+    // Cleanup.
+    Translator translator(sess, model);
+    if (model == "keatest-module") {
+        translator.deleteItem("/keatest-module:container");
+        translator.deleteItem("/keatest-module:kernel-modules");
+        translator.deleteItem("/keatest-module:list");
+        translator.deleteItem("/keatest-module:main");
+        translator.deleteItem("/keatest-module:presence-container");
+    } else {
+        string toplevel_node("config");
+        if (model == IETF_DHCPV6_SERVER) {
+            toplevel_node = "server";
+        }
+        EXPECT_NO_THROW_LOG(translator.deleteItem("/" + model + ":" + toplevel_node));
+    }
+
+    // Get it.
+    YangRepr repr(model);
+
+    EXPECT_NO_THROW_LOG(repr.set(tree, sess));
+    bool result = false;
+    EXPECT_NO_THROW_LOG(result = repr.verify(tree, sess, cerr));
+    EXPECT_TRUE(result);
+}
+
+// This is test environment sanity check. It verifies that all configuration
+// defined in yang_configs.h are sane.
+TEST(YangReprTest, verifyConfigs) {
+    for (auto x : TEST_CONFIGS) {
+        sanityCheckConfig(x.first, x.second);
+    }
+}
+
+}  // namespace
diff --git a/src/lib/yang/tests/yang_configs.h b/src/lib/yang/tests/yang_configs.h
new file mode 100644
index 0000000..d3825c9
--- /dev/null
+++ b/src/lib/yang/tests/yang_configs.h
@@ -0,0 +1,655 @@
+// 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/.
+
+#ifndef ISC_YANG_CONFIGS_H
+#define ISC_YANG_CONFIGS_H
+
+#include <yang/testutils/translator_test.h>
+#include <yang/yang_models.h>
+
+#include <vector>
+
+namespace isc {
+namespace yang {
+namespace test {
+
+/// @brief The test module from sysrepo tests.
+const std::string testModel = "keatest-module";
+const YRTree testTree = YangRepr::buildTreeFromVector({
+    { "/keatest-module:container",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/keatest-module:main",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/keatest-module:main/string",
+      "str", libyang::LeafBaseType::String, true },
+    { "/keatest-module:main/boolean",
+      "true", libyang::LeafBaseType::Bool, true },
+    { "/keatest-module:main/ui8",
+      "8", libyang::LeafBaseType::Uint8, true },
+    { "/keatest-module:main/ui16",
+      "16", libyang::LeafBaseType::Uint16, true },
+    { "/keatest-module:main/ui32",
+      "32", libyang::LeafBaseType::Uint32, true },
+    { "/keatest-module:main/ui64",
+      "64", libyang::LeafBaseType::Uint64, true },
+    { "/keatest-module:main/i8",
+      "8", libyang::LeafBaseType::Int8, true },
+    { "/keatest-module:main/i16",
+      "16", libyang::LeafBaseType::Int16, true },
+    { "/keatest-module:main/i32",
+      "32", libyang::LeafBaseType::Int32, true },
+    { "/keatest-module:main/i64",
+      "64", libyang::LeafBaseType::Int64, true },
+    { "/keatest-module:main/id_ref",
+      "keatest-module:id_1", libyang::LeafBaseType::IdentityRef, true },
+    { "/keatest-module:main/enum",
+      "maybe", libyang::LeafBaseType::Enum, true },
+    { "/keatest-module:main/raw",
+      "Zm9vYmFy", libyang::LeafBaseType::Binary, true },
+    { "/keatest-module:kernel-modules",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief A subnet with two pools with ietf-dhcpv6-server model.
+const std::string subnetTwoPoolsModelIetf6 = IETF_DHCPV6_SERVER;
+const YRTree subnetTwoPoolsTreeIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-id",
+      "0", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-prefix",
+      "2001:db8::1:0/112", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/start-address",
+      "2001:db8::1:0", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/end-address",
+      "2001:db8::1:ffff", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/max-address-count",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-id",
+      "1", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-prefix",
+      "2001:db8::2:0/112", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/start-address",
+      "2001:db8::2:0", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/end-address",
+      "2001:db8::2:ffff", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/max-address-count",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", libyang::LeafBaseType::Uint16, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief A subnet with timers with ietf-dhcpv6-server model.
+const std::string subnetTimersModel = IETF_DHCPV6_SERVER;
+const YRTree subnetTimersIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-id",
+      "0", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/pool-prefix",
+      "2001:db8::1:0/112", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/start-address",
+      "2001:db8::1:0", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/end-address",
+      "2001:db8::1:ffff", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/renew-time",
+      "1000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/rebind-time",
+      "2000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='0']/max-address-count",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-id",
+      "1", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/pool-prefix",
+      "2001:db8::2:0/112", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/start-address",
+      "2001:db8::2:0", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/end-address",
+      "2001:db8::2:ffff", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/renew-time",
+      "1000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/rebind-time",
+      "2000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools/"
+      "address-pool[pool-id='1']/max-address-count",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", libyang::LeafBaseType::Uint16, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief A subnet with two pools with ietf-dhcpv6-server model
+/// which validates.
+const std::string validModelIetf6 = IETF_DHCPV6_SERVER;
+const YRTree validTreeIetf6 = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes"
+      "/vendor-info/ent-num",
+      "2495", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-range-id",
+      "111", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-description",
+      "Subnet#111", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/network-prefix",
+      "2001:db8::/48", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/pool-id",
+      "0", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/prefix",
+      "2001:db8:1::/48", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/prefix-length",
+      "48", libyang::LeafBaseType::Uint8, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/valid-lifetime",
+      "4000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/preferred-lifetime",
+      "3000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/renew-time",
+      "1000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/rebind-time",
+      "2000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/rapid-commit",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/option-set-id",
+      "0", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='0']/max-pd-space-utilization",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/pool-id",
+      "1", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/prefix",
+      "2001:db8:2::/48", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/prefix-length",
+      "48", libyang::LeafBaseType::Uint8, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/valid-lifetime",
+      "4000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/preferred-lifetime",
+      "3000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/renew-time",
+      "1000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/rebind-time",
+      "2000", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/rapid-commit",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/option-set-id",
+      "0", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools/"
+      "pd-pool[pool-id='1']/max-pd-space-utilization",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", libyang::LeafBaseType::Uint16, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/address-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/pd-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='111']/host-reservations",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief A subnet with a pool and option data lists with
+/// kea-dhcp4-server:config model.
+const std::string subnetOptionsModelKeaDhcp4 = KEA_DHCP4_SERVER;
+const YRTree subnetOptionsTreeKeaDhcp4 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp4-server:config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/id",
+      "111", libyang::LeafBaseType::Uint32, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/code",
+      "100", libyang::LeafBaseType::Uint8, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/space",
+      "dns", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/data",
+      "12121212", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/csv-format",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/always-send",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "option-data[code='100'][space='dns']/never-send",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/start-address",
+      "10.0.1.0", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/end-address",
+      "10.0.1.255", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/"
+      "pool[start-address='10.0.1.0'][end-address='10.0.1.255']/prefix",
+      "10.0.1.0/24", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/subnet",
+      "10.0.0.0/8", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp4-server:config/expired-leases-processing",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/dhcp-ddns",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/config-control",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/sanity-checks",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/interfaces-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/subnet4[id='111']/relay",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/compatibility",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/multi-threading",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief A subnet with a pool and option data lists with
+/// kea-dhcp6-server:config model.
+const std::string subnetOptionsModelKeaDhcp6 = KEA_DHCP6_SERVER;
+const YRTree subnetOptionsTreeKeaDhcp6 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp6-server:config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/id",
+      "111", libyang::LeafBaseType::Uint32, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "start-address",
+      "2001:db8::1:0", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "end-address",
+      "2001:db8::1:ffff", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "prefix",
+      "2001:db8::1:0/112", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/code",
+      "100", libyang::LeafBaseType::Uint16, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/space",
+      "dns", libyang::LeafBaseType::String, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/data",
+      "12121212", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/csv-format",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/always-send",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/"
+      "pool[start-address='2001:db8::1:0'][end-address='2001:db8::1:ffff']/"
+      "option-data[code='100'][space='dns']/never-send",
+      "false", libyang::LeafBaseType::Bool, true },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/subnet",
+      "2001:db8::/48", libyang::LeafBaseType::String, true },
+    { "/kea-dhcp6-server:config/expired-leases-processing",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/dhcp-ddns",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/config-control",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/sanity-checks",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/interfaces-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/subnet6[id='111']/relay",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/compatibility",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/multi-threading",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief Example from the design document.
+const std::string designExampleModel = IETF_DHCPV6_SERVER;
+const YRTree designExampleTree = YangRepr::buildTreeFromVector({
+    { "/ietf-dhcpv6-server:server",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-range-id",
+      "1", libyang::LeafBaseType::Uint32, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-description",
+      "example", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/pool-id",
+      "0", libyang::LeafBaseType::Uint32, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/prefix",
+      "2001:db8:20:b00::/57", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/pd-pool[pool-id='0']"
+      "/prefix-length",
+      "57", libyang::LeafBaseType::Uint8, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/pd-pools/"
+      "pd-pool[pool-id='0']/max-pd-space-utilization",
+      "disabled", libyang::LeafBaseType::Enum, true },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/network-prefix",
+      "2001:db8:20:b00::/56", libyang::LeafBaseType::String, true },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid/type-code",
+      "65535", libyang::LeafBaseType::Uint16, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/host-reservations",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/duid",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/lease-storage",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/serv-attributes/vendor-info",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/option-sets",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/relay-opaque-paras",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/rsoo-enabled-options",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/ietf-dhcpv6-server:server/server-config/network-ranges/"
+      "network-range[network-range-id='1']/address-pools",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+const YRTree emptyTreeKeaDhcp4 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp4-server:config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/expired-leases-processing",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/dhcp-ddns",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/config-control",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/sanity-checks",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/interfaces-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/compatibility",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp4-server:config/multi-threading",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+const YRTree emptyTreeKeaDhcp6 = YangRepr::buildTreeFromVector({
+    { "/kea-dhcp6-server:config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/expired-leases-processing",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/dhcp-ddns",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/config-control",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/sanity-checks",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/interfaces-config",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/compatibility",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+    { "/kea-dhcp6-server:config/multi-threading",
+      std::nullopt, libyang::LeafBaseType::Unknown, false },
+});
+
+/// @brief Set of example configurations.
+const std::vector<std::pair<std::string, YRTree> > TEST_CONFIGS =
+{
+    { testModel,                   testTree },
+    { subnetTwoPoolsModelIetf6,    subnetTwoPoolsTreeIetf6 },
+    { subnetTimersModel,           subnetTimersIetf6 },
+    { validModelIetf6,             validTreeIetf6 },
+    { subnetOptionsModelKeaDhcp4,  subnetOptionsTreeKeaDhcp4 },
+    { subnetOptionsModelKeaDhcp6,  subnetOptionsTreeKeaDhcp6 },
+    { designExampleModel,          designExampleTree }
+};  // TEST_CONFIGS
+
+}  // namespace test
+}  // namespace yang
+}  // namespace isc
+
+#endif  // ISC_YANG_CONFIGS_H