@Test
 public void lookupEndpointTest() {
   when(readOptional.isPresent()).thenReturn(true);
   when(readOptional.get()).thenReturn(endpoint);
   Endpoint result = EndpointHelper.lookupEndpoint(epKey, readTransaction);
   Assert.assertEquals(result, endpoint);
 }
 @Test
 public void updateEndpointWithLocationTest() throws Exception {
   String nodeIdString = "nodeIdString";
   String nodeConnectorIdString = "nodeConnectorIdString";
   EndpointHelper.updateEndpointWithLocation(
       endpoint, nodeIdString, nodeConnectorIdString, writeTransaction);
   verify(submitFuture).checkedGet();
 }
 @Test
 public void updateEndpointRemoveLocationTest() throws Exception {
   EndpointHelper.updateEndpointRemoveLocation(endpoint, writeTransaction);
   verify(submitFuture).checkedGet();
 }
 @Test
 public void lookupEndpointTestNull() {
   when(readOptional.isPresent()).thenReturn(false);
   Endpoint result = EndpointHelper.lookupEndpoint(epKey, readTransaction);
   Assert.assertNull(result);
 }