@Test
public void testRollbackWithNullHmsToken()
{

    rollbackSpec.setId( null );
    HMSRestException e = rollback( rollbackSpec );
    assertNotNull( e );
    assertEquals( e.getResponseErrorCode(), Status.BAD_REQUEST.getStatusCode() );
    message = "'id' is a mandatory parameter for HMS Upgrade rollback.";
    assertEquals( message, e.getReason() );
}