Add missing test class for OchSignal

Change-Id: I2cbd0365c31e7328bea8f11b8d2dfc7bdeb79f21

+/*
+ * 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.net;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Test for OchSignal.
+ */
+public class OchSignalTest {
+
+    private final Lambda och1 = Lambda.ochSignal(GridType.DWDM, ChannelSpacing.CHL_100GHZ, 1, 1);
+    private final Lambda sameOch1 = Lambda.ochSignal(GridType.DWDM, ChannelSpacing.CHL_100GHZ, 1, 1);
+    private final Lambda och2 = Lambda.ochSignal(GridType.CWDM, ChannelSpacing.CHL_6P25GHZ, 4, 1);
+    private final Lambda sameOch2 = Lambda.ochSignal(GridType.CWDM, ChannelSpacing.CHL_6P25GHZ, 4, 1);
+
+    @Test
+    public void testEquality() {
+        new EqualsTester()
+                .addEqualityGroup(och1, sameOch1)
+                .addEqualityGroup(och2, sameOch2)
+                .testEquals();
+    }
+}