@Test
public void getEmptyFactHandlesTest() { 

    GetFactHandlesCommand command = new GetFactHandlesCommand();
    Object result = runner.execute(command, context);
    if( result instanceof Collection<?> ) { 
        assertNotNull(result);
        assertTrue(((Collection<?>) result).isEmpty());
    }
    else { 
       fail("result of command was NOT a collection of FactHandles"); 
    }
}