@Test
    public void itSetsBoilerStatus() {
        maker.setBoilerStatus(CoffeeMakerAPI.BOILER_EMPTY);
        assertEquals(CoffeeMakerAPI.BOILER_EMPTY, maker.getBoilerStatus());

        maker.setBoilerStatus(CoffeeMakerAPI.BOILER_NOT_EMPTY);
        assertEquals(CoffeeMakerAPI.BOILER_NOT_EMPTY, maker.getBoilerStatus());
    }