public void TestDraw(bool isEnabled) { var view = new Mock <IStepper>(); var canvas = new Mock <ICanvas>(); var drawable = new StepperDrawable(view.Object); drawable.IsEnabled = isEnabled; Assert.Equal(isEnabled, drawable.IsEnabled); var exception = Record.Exception(() => { drawable.Draw(canvas.Object, new RectF(0, 0, 100, 100)); }); Assert.Null(exception); }