public void UpdateCurrentValue_Overload_StopChargeCalled() { int overloadCurrent = 750; _chargerUsb = Substitute.For <IUsbCharger>(); _display = Substitute.For <IDisplay>(); ChargeControl uut = new ChargeControl(_chargerUsb, _display); uut.UpdateCurrentCalue(overloadCurrent); _chargerUsb.Received().StopCharge(); }