public void Solve()
 {
     var controller = new HomeController();
     string VALID_STARTING_PUZZLE = "6x7x81xxxx5x9xxx32xxxx5xxxx2x6xxxxx3x74xxx95x8xxxxx7x4xxxx1xxxx94xxx2x7xxxx74x2x8";
     PartialViewResult result = controller.Solve(VALID_STARTING_PUZZLE);
     Assert.IsNotNull(result);
 }
        public void Index()
        {
            // Arrange
            var controller = new HomeController();

            // Act
            var result = controller.Index() as ViewResult;

            // Assert
            Assert.IsNotNull(result);
        }