diff --git a/apps/yms/app/src/test/java/org/onosproject/yms/app/ymsm/MockCoreService.java b/apps/yms/app/src/test/java/org/onosproject/yms/app/ymsm/MockCoreService.java
new file mode 100644
index 0000000..62f00aa
--- /dev/null
+++ b/apps/yms/app/src/test/java/org/onosproject/yms/app/ymsm/MockCoreService.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016-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.yms.app.ymsm;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.core.IdGenerator;
+import org.onosproject.core.Version;
+
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * Represents implementation of CoreService interfaces.
+ */
+public class MockCoreService implements CoreService {
+    @Override
+    public Version version() {
+        return null;
+    }
+
+    @Override
+    public Set<ApplicationId> getAppIds() {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getAppId(Short id) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId getAppId(String name) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId registerApplication(String name) {
+        return null;
+    }
+
+    @Override
+    public ApplicationId registerApplication(String name,
+                                             Runnable preDeactivate) {
+        return null;
+    }
+
+    @Override
+    public IdGenerator getIdGenerator(String topic) {
+        return new IdGenerator() {
+            private AtomicLong counter = new AtomicLong(0);
+
+            @Override
+            public long getNewId() {
+                return counter.getAndIncrement();
+            }
+        };
+    }
+}