[Test]
public void CreateEntity2D()
{
    var entity = new Entity2D(DoubleSizedRectangle) { Color = Color.Green, Rotation = 15 };
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
    Assert.AreEqual(Color.Green, entity.Color);
    Assert.AreEqual(15, entity.Rotation);
    Assert.AreEqual(DrawableEntity.DefaultRenderLayer, entity.RenderLayer);
    Assert.AreEqual(Vector2D.One, entity.Center);
    Assert.AreEqual(new Size(2, 2), entity.Size);
}

[Test]
public void CreateEntity2D()
{
    var entity = new Entity2D(DoubleSizedRectangle) { Color = Color.Green, Rotation = 15 };
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
    Assert.AreEqual(Color.Green, entity.Color);
    Assert.AreEqual(15, entity.Rotation);
    Assert.AreEqual(DrawableEntity.DefaultRenderLayer, entity.RenderLayer);
    Assert.AreEqual(Vector2D.One, entity.Center);
    Assert.AreEqual(new Size(2, 2), entity.Size);
}

[Test]
public void AddNewComponent()
{
    var entity = new Entity2D(Rectangle.Zero);
    Assert.AreEqual(Rectangle.Zero, entity.DrawArea);
    Assert.AreEqual(Color.White, entity.Color);
    Assert.AreEqual(0, entity.NumberOfComponents);
    entity.Add(Size.Zero);
    Assert.AreEqual(1, entity.NumberOfComponents);
}

[Test]
public void AddNewComponent()
{
    var entity = new Entity2D(Rectangle.Zero);
    Assert.AreEqual(Rectangle.Zero, entity.DrawArea);
    Assert.AreEqual(Color.White, entity.Color);
    Assert.AreEqual(0, entity.NumberOfComponents);
    entity.Add(Size.Zero);
    Assert.AreEqual(1, entity.NumberOfComponents);
}

[Test]
public void SetDrawAreaProperties()
{
    var entity = new Entity2D(Rectangle.One)
    {
        Color = Color.Blue,
        Center = Vector2D.One,
        Size = new Size(2)
    };
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
    entity.DrawArea = new Rectangle(-1, -1, 2, 2);
    Assert.AreEqual(Vector2D.Zero, entity.Center);
    entity.TopLeft = Vector2D.Zero;
    Assert.AreEqual(Vector2D.Zero, entity.TopLeft);
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
}

[Test]
public void SetDrawAreaProperties()
{
    var entity = new Entity2D(Rectangle.One)
    {
        Color = Color.Blue,
        Center = Vector2D.One,
        Size = new Size(2)
    };
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
    entity.DrawArea = new Rectangle(-1, -1, 2, 2);
    Assert.AreEqual(Vector2D.Zero, entity.Center);
    entity.TopLeft = Vector2D.Zero;
    Assert.AreEqual(Vector2D.Zero, entity.TopLeft);
    Assert.AreEqual(DoubleSizedRectangle, entity.DrawArea);
}