@Override
    public void calculate() {

    }
@Test
    public void testCalculate() {
        function.accept(MeterEntity.newService("service-test", Layer.GENERAL), LARGE_VALUE);
        function.accept(MeterEntity.newService("service-test", Layer.GENERAL), SMALL_VALUE);
        function.calculate();

        assertThat(function.getValue()).isEqualTo(LARGE_VALUE);
    }