@Test
    public void itSetsWarmerPlateStatus() {
        maker.setWarmerPlateStatus(CoffeeMakerAPI.WARMER_ON);
        assertEquals(CoffeeMakerAPI.WARMER_ON, maker.getWarmerPlateStatus());

        maker.setWarmerPlateStatus(CoffeeMakerAPI.WARMER_OFF);
        assertEquals(CoffeeMakerAPI.WARMER_OFF, maker.getWarmerPlateStatus());
    }