[Test, CloseAfterFirstFrame]
public void Create()
{
    var trigger = new MouseDragDropTrigger(Rectangle.One, MouseButton.Right);
    Assert.AreEqual(Rectangle.One, trigger.StartArea);
    Assert.AreEqual(MouseButton.Right, trigger.Button);
    Assert.AreEqual(Vector2D.Unused, trigger.StartDragPosition);
}

[Test, CloseAfterFirstFrame]
public void Create()
{
    var trigger = new MouseDragDropTrigger(Rectangle.One, MouseButton.Right);
    Assert.AreEqual(Rectangle.One, trigger.StartArea);
    Assert.AreEqual(MouseButton.Right, trigger.Button);
    Assert.AreEqual(Vector2D.Unused, trigger.StartDragPosition);
}

    [Test, CloseAfterFirstFrame]
    public void CreateFromAttributes()
    {
        var trigger = new MouseDragDropTrigger(new Dictionary<string, string>
            {
                { "StartArea", "1.1 2.2 3.3 4.4" },
                { "Button", "Right" }
            });
        Assert.AreEqual(new Rectangle(1.1f, 2.2f, 3.3f, 4.4f), trigger.StartArea);
        Assert.AreEqual(MouseButton.Right, trigger.Button);
        Assert.AreEqual(Vector2D.Unused, trigger.StartDragPosition);
        Assert.Throws<MouseDragDropTrigger.CannotCreateMouseDragDropTriggerWithoutStartArea>(
            () => new MouseDragDropTrigger(new Dictionary<string, string>()));
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropOutsideStartArea()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Zero);
        SetMouseState(State.Pressed, Vector2D.One);
        SetMouseState(State.Releasing, Vector2D.One);
        SetMouseState(State.Released, Vector2D.One);
        Assert.AreEqual(-Vector2D.One, startPoint);
    }

    private void SetMouseState(State state, Vector2D position)
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        mouse.SetButtonState(MouseButton.Left, state);
        mouse.SetNativePosition(position);
        AdvanceTimeAndUpdateEntities();
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropInsideStartArea()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Half);
        SetMouseState(State.Pressed, Vector2D.One);
        SetMouseState(State.Releasing, Vector2D.One);
        Assert.AreEqual(Vector2D.Half, startPoint);
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropCloseToStartPointWillDoNothing()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Half);
        SetMouseState(State.Pressed, Vector2D.Half);
        SetMouseState(State.Releasing, Vector2D.Half);
        Assert.AreEqual(-Vector2D.One, startPoint);
    }
}

    [Test, CloseAfterFirstFrame]
    public void CreateFromAttributes()
    {
        var trigger = new MouseDragDropTrigger(new Dictionary<string, string>
            {
                { "StartArea", "1.1 2.2 3.3 4.4" },
                { "Button", "Right" }
            });
        Assert.AreEqual(new Rectangle(1.1f, 2.2f, 3.3f, 4.4f), trigger.StartArea);
        Assert.AreEqual(MouseButton.Right, trigger.Button);
        Assert.AreEqual(Vector2D.Unused, trigger.StartDragPosition);
        Assert.Throws<MouseDragDropTrigger.CannotCreateMouseDragDropTriggerWithoutStartArea>(
            () => new MouseDragDropTrigger(new Dictionary<string, string>()));
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropOutsideStartArea()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Zero);
        SetMouseState(State.Pressed, Vector2D.One);
        SetMouseState(State.Releasing, Vector2D.One);
        SetMouseState(State.Released, Vector2D.One);
        Assert.AreEqual(-Vector2D.One, startPoint);
    }

    private void SetMouseState(State state, Vector2D position)
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        mouse.SetButtonState(MouseButton.Left, state);
        mouse.SetNativePosition(position);
        AdvanceTimeAndUpdateEntities();
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropInsideStartArea()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Half);
        SetMouseState(State.Pressed, Vector2D.One);
        SetMouseState(State.Releasing, Vector2D.One);
        Assert.AreEqual(Vector2D.Half, startPoint);
    }

    [Test, CloseAfterFirstFrame]
    public void DragDropCloseToStartPointWillDoNothing()
    {
        if (mouse == null)
            return; //ncrunch: no coverage
        Vector2D startPoint = -Vector2D.One;
        new Command(position => { startPoint = position; }).Add(
            new MouseDragDropTrigger(Rectangle.HalfCentered, MouseButton.Left));
        SetMouseState(State.Pressing, Vector2D.Half);
        SetMouseState(State.Pressed, Vector2D.Half);
        SetMouseState(State.Releasing, Vector2D.Half);
        Assert.AreEqual(-Vector2D.One, startPoint);
    }
}