public async void RedirectToAction_Execute_PassesCorrectValuesToRedirect()
        {
            // Arrange
            var expectedUrl = "SampleAction";
            var expectedPermanentFlag = false;

            var httpContext = new Mock<HttpContext>();
            httpContext
                .SetupGet(o => o.RequestServices)
                .Returns(CreateServices().BuildServiceProvider());

            var httpResponse = new Mock<HttpResponse>();
            httpContext
                .Setup(o => o.Response)
                .Returns(httpResponse.Object);

            var actionContext = new ActionContext(httpContext.Object, new RouteData(), new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(expectedUrl);
            var result = new RedirectToActionResult("SampleAction", null, null)
            {
                UrlHelper = urlHelper,
            };

            // Act
            await result.ExecuteResultAsync(actionContext);

            // Assert
            // Verifying if Redirect was called with the specific Url and parameter flag.
            // Thus we verify that the Url returned by UrlHelper is passed properly to
            // Redirect method and that the method is called exactly once.
            httpResponse.Verify(r => r.Redirect(expectedUrl, expectedPermanentFlag), Times.Exactly(1));
        }
        public async Task RedirectToAction_Execute_ThrowsOnNullUrl()
        {
            // Arrange
            var httpContext = new Mock<HttpContext>();
            httpContext
                .Setup(o => o.Response)
                .Returns(new Mock<HttpResponse>().Object);
            httpContext
                .SetupGet(o => o.RequestServices)
                .Returns(CreateServices().BuildServiceProvider());

            var actionContext = new ActionContext(httpContext.Object, new RouteData(), new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(returnValue: null);
            var result = new RedirectToActionResult(null, null, null)
            {
                UrlHelper = urlHelper,
            };

            // Act & Assert
            await ExceptionAssert.ThrowsAsync<InvalidOperationException>(
                async () =>
                {
                    await result.ExecuteResultAsync(actionContext);
                },
                "No route matches the supplied values.");
        }
        public async Task RedirectToAction_Execute_ThrowsOnNullUrl()
        {
            // Arrange
            var httpContext = new Mock <HttpContext>();

            httpContext.Setup(o => o.Response).Returns(new Mock <HttpResponse>().Object);
            var actionContext = new ActionContext(httpContext.Object,
                                                  new RouteData(),
                                                  new ActionDescriptor());

            var urlHelper = GetMockUrlHelper(returnValue: null);
            var result    = new RedirectToActionResult(null, null, null)
            {
                UrlHelper = urlHelper,
            };

            // Act & Assert
            await ExceptionAssert.ThrowsAsync <InvalidOperationException>(
                async() =>
            {
                await result.ExecuteResultAsync(actionContext);
            },
                "No route matches the supplied values.");
        }