Add unit test for OpenstackSwitchingDhcpHandler

Change-Id: I6ee10379a582698d13d5f9c58660302322715d1e
diff --git a/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNodeServiceAdapter.java b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNodeServiceAdapter.java
new file mode 100644
index 0000000..a738c09
--- /dev/null
+++ b/apps/openstacknetworking/app/src/test/java/org/onosproject/openstacknetworking/impl/OpenstackNodeServiceAdapter.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2018-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.openstacknetworking.impl;
+
+import com.google.common.collect.ImmutableSet;
+import org.onosproject.net.DeviceId;
+import org.onosproject.openstacknode.api.OpenstackNode;
+import org.onosproject.openstacknode.api.OpenstackNodeListener;
+import org.onosproject.openstacknode.api.OpenstackNodeService;
+
+import java.util.Set;
+
+/**
+ * Test adapter for OpenstackNodeService.
+ */
+public class OpenstackNodeServiceAdapter implements OpenstackNodeService {
+    @Override
+    public Set<OpenstackNode> nodes() {
+        return ImmutableSet.of();
+    }
+
+    @Override
+    public Set<OpenstackNode> nodes(OpenstackNode.NodeType type) {
+        return ImmutableSet.of();
+    }
+
+    @Override
+    public Set<OpenstackNode> completeNodes() {
+        return ImmutableSet.of();
+    }
+
+    @Override
+    public Set<OpenstackNode> completeNodes(OpenstackNode.NodeType type) {
+        return ImmutableSet.of();
+    }
+
+    @Override
+    public OpenstackNode node(String hostname) {
+        return null;
+    }
+
+    @Override
+    public OpenstackNode node(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public void addListener(OpenstackNodeListener listener) {
+
+    }
+
+    @Override
+    public void removeListener(OpenstackNodeListener listener) {
+
+    }
+}