public void Test_Utils_Thickness_IsZero()
        {
            var th1 = new Thickness(10, 20, 30, 40);

            Assert.AreEqual(false, th1.IsZero());

            var th2 = new Thickness(0, 0, 0, 0.0e-279);

            Assert.AreEqual(true, th2.IsZero());
        }