public void TestMethod7()
        {
            //Arrange
            object str      = "#343473847#";
            string expected = "Two's a pair.";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void TestMethod6()
        {
            //Arrange
            object str      = "dfdkf49824fdfdfjhd";
            string expected = "Two's a pair.";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void TestMethod5()
        {
            //Arrange
            object str      = new int[] { 1, 2, 3 };
            string expected = "Incompatible.";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void TestMethod3()
        {
            //Arrange
            object str      = "[]";
            string expected = "][";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void TestMethod2()
        {
            //Arrange
            object str      = "Anna, Banana";
            string expected = "anna, BananA";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }
        public void TestMethod1()
        {
            //Arrange
            object str      = "Cat, dog, and mouse.";
            string expected = ".at, dog, and mouseC";
            //Act
            string actual = Challenge134.FlipEndChars(str);

            //Assert
            Assert.AreEqual(expected, actual);
        }