public void UnwindTest()
{
ToyPlane toy = new ToyPlane();
//isWoundUp = true
toy.windUp();
string isWoundUpString = toy.getWindUpString();
Assert.AreEqual(isWoundUpString, $"{toy} is wound up.");
//isWoundUp = false
toy.unWind();
isWoundUpString = toy.getWindUpString();
Assert.AreEqual(isWoundUpString, $"{toy} is not wound up.");
}