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diff --git a/src/lib/d2srv/tests/d2_zone_unittests.cc b/src/lib/d2srv/tests/d2_zone_unittests.cc
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+++ b/src/lib/d2srv/tests/d2_zone_unittests.cc
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+// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <d2srv/d2_zone.h>
+#include <gtest/gtest.h>
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::d2;
+using namespace isc::dns;
+
+namespace {
+
+// This test verifies that Zone object is created and its constructor sets
+// appropriate values for its members.
+TEST(D2ZoneTest, constructor) {
+    // Create first object.
+    D2Zone zone1(Name("example.com"), RRClass::ANY());
+    EXPECT_EQ("example.com.", zone1.getName().toText());
+    EXPECT_EQ(RRClass::ANY().getCode(), zone1.getClass().getCode());
+    // Create another object to make sure that constructor doesn't assign
+    // fixed values, but they change when constructor's parameters change.
+    D2Zone zone2(Name("foo.example.com"), RRClass::IN());
+    EXPECT_EQ("foo.example.com.", zone2.getName().toText());
+    EXPECT_EQ(RRClass::IN().getCode(), zone2.getClass().getCode());
+}
+
+// This test verifies that toText() function returns text representation of
+// of the zone in expected format.
+TEST(D2ZoneTest, toText) {
+    // Create first object.
+    D2Zone zone1(Name("example.com"), RRClass::ANY());
+    EXPECT_EQ("example.com. ANY SOA\n", zone1.toText());
+    // Create another object with different parameters to make sure that the
+    // function's output changes accordingly.
+    D2Zone zone2(Name("foo.example.com"), RRClass::IN());
+    EXPECT_EQ("foo.example.com. IN SOA\n", zone2.toText());
+}
+
+  // Same than for toText() but using the << operator.
+TEST(D2ZoneTest, output) {
+    // Create first object.
+    D2Zone zone1(Name("example.com"), RRClass::ANY());
+    ostringstream ss;
+    ss << zone1;
+    EXPECT_EQ("example.com. ANY SOA\n", ss.str());
+    // Create another object with different parameters to make sure that the
+    // function's output changes accordingly.
+    D2Zone zone2(Name("foo.example.com"), RRClass::IN());
+    ostringstream ss2;
+    ss2 << zone2;
+    EXPECT_EQ("foo.example.com. IN SOA\n", ss2.str());
+}
+
+// This test verifies that the equality and inequality operators behave as
+// expected.
+TEST(D2ZoneTest, compare) {
+    const Name a("a"), b("b");
+    const RRClass in(RRClass::IN()), any(RRClass::ANY());
+
+    // Equality check
+    EXPECT_TRUE(D2Zone(a, any) == D2Zone(a, any));
+    EXPECT_FALSE(D2Zone(a, any) != D2Zone(a, any));
+
+    // Inequality check, objects differ by class.
+    EXPECT_FALSE(D2Zone(a, any) == D2Zone(a, in));
+    EXPECT_TRUE(D2Zone(a, any) != D2Zone(a, in));
+
+    // Inequality check, objects differ by name.
+    EXPECT_FALSE(D2Zone(a, any) == D2Zone(b, any));
+    EXPECT_TRUE(D2Zone(a, any) != D2Zone(b, any));
+
+    // Inequality check, objects differ by name and class.
+    EXPECT_FALSE(D2Zone(a, any) == D2Zone(b, in));
+    EXPECT_TRUE(D2Zone(a, any) != D2Zone(b, in));
+}
+
+} // End of anonymous namespace