public void ShouldTransitionYellowToRed()
{
Stoplight light = new Stoplight();
light.Next();
light.Next();
Assert.AreEqual(Stoplight.Red, light.CurrentColor);
}
public void ShouldTransitionRedToGreen()
{
Stoplight light = new Stoplight();
light.Next();
light.Next();
light.Next();
Assert.AreEqual(Stoplight.Green, light.CurrentColor);
}
public void ShouldTransitionGreenToYellow()
{
Stoplight light = new Stoplight();
light.Next();
Assert.AreEqual(Stoplight.Yellow, light.CurrentColor);
}
public void ShouldLogMessageOnChange()
{
Stoplight light = new Stoplight();
MockLogger logger = new MockLogger();
light.Logger = logger;
light.Next();
Assert.IsNotNull(logger.LastMessage);
Assert.IsTrue(logger.LastMessage.StartsWith("LIGHT CHANGED TO"));
}
public void ShouldRaiseChangedEventOnTransition()
{
bool eventFired = false;
StoplightColors newColor = StoplightColors.Green;
Stoplight light = new Stoplight();
light.Changed += delegate(object sender, LightChangedEventArgs e)
{
eventFired = true;
newColor = e.CurrentColor;
};
light.Next();
Assert.IsTrue(eventFired);
Assert.AreEqual(Stoplight.Yellow, newColor);
}