public void playing_with_bitflags()
{
EngineState state = EngineState.IsRunning
| EngineState.IsClutch;
bool isRunning = state.CheckRunning();
isRunning.Should().BeTrue();
state = state.StopEngine();
state.CheckRunning().Should().BeFalse();
state.GetSpeed().Should().Be(0);
state = state.SetSpeed(3);
state.GetSpeed().Should().Be(3);
}