@Test
public void testIfApplicationPriorityIsNotSet() {

  Job mockJob = mock(Job.class);
  RMCommunicator communicator = mock(RMCommunicator.class);
  ClientService service = mock(ClientService.class);
  AppContext context = mock(AppContext.class);
  AMPreemptionPolicy policy = mock(AMPreemptionPolicy.class);
  when(communicator.getJob()).thenReturn(mockJob);
  RMContainerAllocator allocator = new RMContainerAllocator(service, context,
      policy);
  AllocateResponse response = Records.newRecord(AllocateResponse.class);
  allocator.handleJobPriorityChange(response);
}