Implement basic unit tests for RouteHandler

In addition,
    - Refactor Segment Routing unit test mocking

Change-Id: I94cb75a8b12944264faa76301d58ee19f246d584
diff --git a/src/test/java/org/onosproject/segmentrouting/MockHostService.java b/src/test/java/org/onosproject/segmentrouting/MockHostService.java
new file mode 100644
index 0000000..1bd593c
--- /dev/null
+++ b/src/test/java/org/onosproject/segmentrouting/MockHostService.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.segmentrouting;
+
+import com.google.common.collect.ImmutableSet;
+import org.onosproject.net.Host;
+import org.onosproject.net.host.HostServiceAdapter;
+
+import java.util.Set;
+
+/**
+ * Mock Host Service.
+ */
+public class MockHostService extends HostServiceAdapter {
+    private Set<Host> hosts;
+
+    MockHostService(Set<Host> hosts) {
+        this.hosts = ImmutableSet.copyOf(hosts);
+    }
+
+    @Override
+    public Set<Host> getHosts() {
+        return hosts;
+    }
+}