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

Change-Id: Ia0a20712f8108549b3ac6434be8aee1bc6025bb2
diff --git a/core/api/src/test/java/org/onosproject/net/pi/runtime/PiTableIdTest.java b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiTableIdTest.java
new file mode 100644
index 0000000..4e421ea
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiTableIdTest.java
@@ -0,0 +1,94 @@
+/*
+ * 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.runtime;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+
+/**
+ * Unit tests for PiTableId class.
+ */
+public class PiTableIdTest {
+    final String table10 = "table10";
+    final String table20 = "table20";
+    final PiTableId piTableId1 = PiTableId.of(table10);
+    final PiTableId sameAsPiTableId1 = PiTableId.of(table10);
+    final PiTableId piTableId2 = PiTableId.of(table20);
+
+    final String tableScope = "local";
+    final PiTableId piTableIdWithScope1 = PiTableId.of(tableScope, table10);
+    final PiTableId sameAsPiTableIdWithScope1 = PiTableId.of(tableScope, table10);
+    final PiTableId piTableIdWithScope2 = PiTableId.of(tableScope, table20);
+    /**
+     * Checks that the PiTableId class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(PiTableId.class);
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(piTableId1, sameAsPiTableId1)
+                .addEqualityGroup(piTableId2)
+                .testEquals();
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEqualsWithScope() {
+        new EqualsTester()
+                .addEqualityGroup(piTableIdWithScope1, sameAsPiTableIdWithScope1)
+                .addEqualityGroup(piTableIdWithScope2)
+                .testEquals();
+    }
+
+    /**
+     * Checks the construction of a PiTableId object.
+     */
+    @Test
+    public void testConstruction() {
+        final String name = "table1";
+        final PiTableId piTableId = PiTableId.of(name);
+        assertThat(piTableId, is(notNullValue()));
+        assertThat(piTableId.name(), is(name));
+    }
+
+    /**
+     * Checks the construction of a PiTableId object.
+     */
+    @Test
+    public void testConstructionWithScope() {
+        final String name = "table1";
+        final String scope = "local";
+        final PiTableId piTableId = PiTableId.of(scope, name);
+        assertThat(piTableId, is(notNullValue()));
+        assertThat(piTableId.name(), is(name));
+        assertThat(piTableId.scope().get(), is(scope));
+    }
+}