Fix test failures

components/mobile-plugins/android-plugin/org.wso2.carbon.device.mgt.mobile.android.api/src/test/java/org/wso2/carbon/mdm/services/android/mocks/DeviceManagementProviderServiceMock.java

@@ -20,6 +20,7 @@ package org.wso2.carbon.mdm.services.android.mocks;
 
 import org.wso2.carbon.device.mgt.common.Device;
 import org.wso2.carbon.device.mgt.common.DeviceIdentifier;
+import org.wso2.carbon.device.mgt.common.DeviceTransferRequest;
 import org.wso2.carbon.device.mgt.common.EnrolmentInfo;
 import org.wso2.carbon.device.mgt.common.FeatureManager;
 import org.wso2.carbon.device.mgt.common.MonitoringOperation;
@@ -661,4 +662,10 @@ public class DeviceManagementProviderServiceMock implements DeviceManagementProv
             AmbiguousConfigurationException {
         return null;
     }
+
+    @Override
+    public List<String> transferDeviceToTenant(DeviceTransferRequest deviceTransferRequest)
+            throws DeviceManagementException, DeviceNotFoundException {
+        return null;
+    }
 }