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

Change-Id: Ia0a20712f8108549b3ac6434be8aee1bc6025bb2
diff --git a/core/api/src/test/java/org/onosproject/net/pi/runtime/PiValidFieldMatchTest.java b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiValidFieldMatchTest.java
new file mode 100644
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+++ b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiValidFieldMatchTest.java
@@ -0,0 +1,73 @@
+/*
+ * 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 org.onosproject.net.pi.model.PiMatchType;
+
+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;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.VID;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.VLAN_HEADER_NAME;
+
+/**
+ * Unit tests for PiValidFieldMatch class.
+ */
+public class PiValidFieldMatchTest {
+
+    final boolean isValid1 = true;
+    final boolean isValid2 = false;
+    final PiHeaderFieldId piHeaderField = PiHeaderFieldId.of(VLAN_HEADER_NAME, VID);
+    PiValidFieldMatch piValidFieldMatch1 = new PiValidFieldMatch(piHeaderField, isValid1);
+    PiValidFieldMatch sameAsPiValidFieldMatch1 = new PiValidFieldMatch(piHeaderField, isValid1);
+    PiValidFieldMatch piValidFieldMatch2 = new PiValidFieldMatch(piHeaderField, isValid2);
+
+    /**
+     * Checks that the PiValidFieldMatch class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(PiValidFieldMatch.class);
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(piValidFieldMatch1, sameAsPiValidFieldMatch1)
+                .addEqualityGroup(piValidFieldMatch2)
+                .testEquals();
+    }
+
+    /**
+     * Checks the construction of a PiValidFieldMatch object.
+     */
+    @Test
+    public void testConstruction() {
+        final boolean isValid = true;
+        final PiHeaderFieldId piHeaderField = PiHeaderFieldId.of(VLAN_HEADER_NAME, VID);
+        PiValidFieldMatch piTernaryFieldMatch = new PiValidFieldMatch(piHeaderField, isValid);
+        assertThat(piTernaryFieldMatch, is(notNullValue()));
+        assertThat(piTernaryFieldMatch.isValid(), is(isValid));
+        assertThat(piTernaryFieldMatch.type(), is(PiMatchType.VALID));
+    }
+}