public void Test_Constructor_Rectangle() { var rectangle = new Rectangle(1, 2, 3, 4); var viewbox = new DrawableViewbox(rectangle); Assert.AreEqual(1, viewbox.UpperLeftX); Assert.AreEqual(2, viewbox.UpperLeftY); Assert.AreEqual(4, viewbox.LowerRightX); Assert.AreEqual(6, viewbox.LowerRightY); viewbox = (DrawableViewbox)rectangle; Assert.AreEqual(1, viewbox.UpperLeftX); Assert.AreEqual(2, viewbox.UpperLeftY); Assert.AreEqual(4, viewbox.LowerRightX); Assert.AreEqual(6, viewbox.LowerRightY); }