ChessClient.Tests.Controllers.AccountControllerTest.ChangePassword_Post_ReturnsViewIfModelStateIsInvalid C# (CSharp) Method

        public void ChangePassword_Post_ReturnsViewIfModelStateIsInvalid()
        {
            // Arrange
            AccountController controller = GetAccountController();
            ChangePasswordModel model = new ChangePasswordModel()
            {
                OldPassword = "goodOldPassword",
                NewPassword = "goodNewPassword",
                ConfirmPassword = "goodNewPassword"
            };
            controller.ModelState.AddModelError("", "Dummy error message.");

            // Act
            ActionResult result = controller.ChangePassword(model);

            // Assert
            Assert.IsInstanceOfType(result, typeof(ViewResult));
            ViewResult viewResult = (ViewResult)result;
            Assert.AreEqual(model, viewResult.ViewData.Model);
            Assert.AreEqual(10, viewResult.ViewData["PasswordLength"]);
        }