Added unit tests for DatabaseUpdate.java

Change-Id: I5d7523a5a7c22ccf7add5b4df074c965362e9cbe

+/*
+ * Copyright 2015 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.store.service;
+
+import com.google.common.testing.EqualsTester;
+import junit.framework.TestCase;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+/**
+ * Unit Tests for DatabseUpdate class.
+ */
+
+public class DatabaseUpdateTest extends TestCase {
+
+    private final DatabaseUpdate stats1 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.PUT)
+            .build();
+
+    private final DatabaseUpdate stats2 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.REMOVE)
+            .build();
+
+    private final DatabaseUpdate stats3 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.REMOVE_IF_VALUE_MATCH)
+            .build();
+
+    private final DatabaseUpdate stats4 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.REMOVE_IF_VERSION_MATCH)
+            .build();
+
+    private final DatabaseUpdate stats5 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.PUT_IF_VALUE_MATCH)
+            .build();
+
+    private final DatabaseUpdate stats6 = DatabaseUpdate.newBuilder()
+            .withCurrentValue("1".getBytes())
+            .withValue("2".getBytes())
+            .withCurrentVersion(3)
+            .withKey("4")
+            .withTableName("5")
+            .withType(DatabaseUpdate.Type.PUT_IF_VERSION_MATCH)
+            .build();
+
+    /**
+     *  Tests the constructor for the class.
+     */
+    @Test
+    public void testConstruction() {
+        assertThat(stats1.currentValue(), is("1".getBytes()));
+        assertThat(stats1.value(), is("2".getBytes()));
+        assertThat(stats1.currentVersion(), is(3L));
+        assertThat(stats1.key(), is("4"));
+        assertThat(stats1.tableName(), is("5"));
+        assertThat(stats1.type(), is(DatabaseUpdate.Type.PUT));
+    }
+
+    /**
+     * Tests the equals, hashCode and toString methods using Guava EqualsTester.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(stats1, stats1)
+                .addEqualityGroup(stats2)
+                .testEquals();
+
+        new EqualsTester()
+                .addEqualityGroup(stats3, stats3)
+                .addEqualityGroup(stats4)
+                .testEquals();
+
+        new EqualsTester()
+                .addEqualityGroup(stats5, stats5)
+                .addEqualityGroup(stats6)
+                .testEquals();
+    }
+
+    /**
+     * Tests if the toString method returns a consistent value for hashing.
+     */
+    @Test
+    public void testToString() {
+        assertThat(stats1.toString(), is(stats1.toString()));
+    }
+
+}
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