[ONOS-6624]Unit tests for Pi* core classes

Change-Id: Ia0a20712f8108549b3ac6434be8aee1bc6025bb2
diff --git a/core/api/src/test/java/org/onosproject/net/pi/model/PiPipeconfIdTest.java b/core/api/src/test/java/org/onosproject/net/pi/model/PiPipeconfIdTest.java
new file mode 100644
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--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/pi/model/PiPipeconfIdTest.java
@@ -0,0 +1,53 @@
+/*
+ * 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.net.pi.model;
+
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+/**
+ * Unit tests for PiPipeconfId class.
+ */
+public class PiPipeconfIdTest {
+    final String id1 = "pipeline1";
+    final String id2 = "pipeline2";
+    final PiPipeconfId piPipeconfId1 = new PiPipeconfId(id1);
+    final PiPipeconfId sameAsPiPipeconfId1 = new PiPipeconfId(id1);
+    final PiPipeconfId piPipeconfId2 = new PiPipeconfId(id2);
+
+    /**
+     * Checks that the PiPipeconfId class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(PiPipeconfId.class);
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(piPipeconfId1, sameAsPiPipeconfId1)
+                .addEqualityGroup(piPipeconfId2)
+                .testEquals();
+    }
+}