public void GivenALineDiscount_WhenAppliedToLine_ThenShouldReturnLineTotalTimesPercentage()
{
var sut = new LineDiscount("d", 1, 1, 1);
var line = new Line(new Bike(string.Empty, string.Empty, 100), 2);
Assert.AreEqual(line.CalculateTotal() * sut.Percentage, sut.Apply(line));
}