diff --git a/apps/mappingmanagement/api/src/test/java/org/onosproject/mapping/DefaultMappingKeyTest.java b/apps/mappingmanagement/api/src/test/java/org/onosproject/mapping/DefaultMappingKeyTest.java
new file mode 100644
index 0000000..35d464b
--- /dev/null
+++ b/apps/mappingmanagement/api/src/test/java/org/onosproject/mapping/DefaultMappingKeyTest.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2017-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.mapping;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+import org.onlab.packet.IpPrefix;
+import org.onosproject.mapping.addresses.MappingAddress;
+import org.onosproject.mapping.addresses.MappingAddresses;
+
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+/**
+ * Unit tests for the default mapping key class.
+ */
+public class DefaultMappingKeyTest {
+
+    private static final String IP_ADDRESS_1 = "1.2.3.4/24";
+    private static final String IP_ADDRESS_2 = "5.6.7.8/24";
+
+    /**
+     * Checks that the DefaultMappingKey class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(DefaultMappingKey.class);
+    }
+
+    /**
+     * Tests equals() method.
+     */
+    @Test
+    public void testEquals() {
+        IpPrefix ip1 = IpPrefix.valueOf(IP_ADDRESS_1);
+        MappingAddress address1 = MappingAddresses.ipv4MappingAddress(ip1);
+
+        MappingKey key1 = DefaultMappingKey.builder()
+                                .withAddress(address1)
+                                .build();
+        MappingKey sameAsKey1 = DefaultMappingKey.builder()
+                                .withAddress(address1)
+                                .build();
+
+        IpPrefix ip2 = IpPrefix.valueOf(IP_ADDRESS_2);
+        MappingAddress address2 = MappingAddresses.ipv4MappingAddress(ip2);
+
+        MappingKey key2 = DefaultMappingKey.builder()
+                                .withAddress(address2)
+                                .build();
+
+        new EqualsTester()
+                .addEqualityGroup(key1, sameAsKey1)
+                .addEqualityGroup(key2)
+                .testEquals();
+    }
+}