public void Accelerate_ShouldDownshiftAndNotMakeSound_WhenCurrentRpmIsLesserThanDownshiftBoundary()
{
var currentRpm = new Rpm(1000d);
_externalSystems.GetCurrentRpm().Returns(currentRpm);
var shiftBoundaries = GetShiftBoundaries(1500d, 3000d);
Sut().Accelerate(shiftBoundaries);
_gearShifter.Received().Downshift();
_gearShifter.DidNotReceive().Upshift();
_externalSystems.DidNotReceive().MakeSound(Arg.Any <SoundVolume>());
}