public void AddTwoFillUp()
{
Car c = new Facts.Car();
FillUp f1 = c.AddFillUp(odometer: 1000, liters: 40.0);
FillUp f2 = c.AddFillUp(odometer: 1600, liters: 50.0);
Assert.Same(f2, f1.NextFillUp);
Assert.Equal(2, c.FillUps.Count);
}
public void AddFirstFillUp()
{
Car c = new Facts.Car();
FillUp f1 = c.AddFillUp(odometer: 1000, liters: 40.0);
Assert.Equal(1, c.FillUps.Count);
Assert.Equal(1000, f1.Odometer);
Assert.Equal(40.0, f1.Liters);
}