public void Meters_Are_Checked_In_Desired_Time()
{
//Sets current time to 2016/05/05 21:34:00
SystemTime.SetNow(new DateTime(2016, 5, 5, 21, 34, 00));
var meterLoader = new Mock <IAmActiveMetersLoader>();
var sut = new SystemTimeDependendProductionCode(meterLoader.Object);
sut.DoPeriodicCheckIfNeeded();
//System check should occur after 22:00, so at 21:34 there should
//be no invocations of ReloadAllActiveMeters
meterLoader.Verify(x => x.ReloadAllActiveMeters(), Times.Exactly(0));
//We're moving time forward, to the threshold hour: 22:00
SystemTime.SetNow(new DateTime(2016, 5, 5, 22, 00, 00));
sut.DoPeriodicCheckIfNeeded();
//Still, no invocation should occur
meterLoader.Verify(x => x.ReloadAllActiveMeters(), Times.Exactly(0));
//Minute after 22:00
SystemTime.SetNow(new DateTime(2016, 5, 5, 22, 01, 00));
sut.DoPeriodicCheckIfNeeded();
//Method should be called
meterLoader.Verify(x => x.ReloadAllActiveMeters(), Times.Exactly(1));
//Clean up in order to conduct other tests
SystemTime.ResetNow();
}
