public void InsertShape()
{
var rectangleFrame = new Rect(200, 200, 200, 150);
var ellipseFrame = new Rect(450, 100, 100, 100);
var triangleFrame = new Rect(100, 100, 250, 100);
var rectangle = new Rectangle(rectangleFrame, null, null);
var ellipse = new Elipse(ellipseFrame, null, null);
var triangle = new Triangle(triangleFrame, null, null);
var group = new GroupShape();
group.InsertShape(rectangle, 0);
Assert.AreEqual(1, group.GetShapesCount());
Assert.ThrowsException <IndexOutOfRangeException>(() => group.InsertShape(triangle, -1));
Assert.ThrowsException <IndexOutOfRangeException>(() => group.InsertShape(ellipse, 2));
group.InsertShape(ellipse, 1);
Assert.AreEqual(2, group.GetShapesCount());
}