Mock Request.Form & Request.QueryString for unit tests

在我们的一些Mvc controller中，有时直接通过Request.Form["key"] 取值，而Form collection 是只读的集合，我们可以通过如下方式mock出需要的Form集合或者url的query字符串。

 

public static void MockControllerContext(this BaseController baseController, string requestUri = "https://test.com", NameValueCollection requestForm = null, NameValueCollection requestQueryString = null)
        {
            var mockControllerContext = new Mock<ControllerContext>();
            var mockHttpContextBase = new Mock<HttpContextBase>();
            var mockHttpResponseBase = new Mock<HttpResponseBase>();
            var mockHttpRequestBase = new Mock<HttpRequestBase>();

            mockHttpRequestBase.Setup(x => x.Url)
                               .Returns(new Uri(requestUri));
            mockHttpRequestBase.Setup(x => x.Form)
                               .Returns(requestForm);
            mockHttpRequestBase.Setup(x => x.QueryString)
                               .Returns(requestQueryString);

            mockHttpResponseBase.Setup(x => x.OutputStream)
                                .Returns(new MemoryStream());
            mockHttpResponseBase.Setup(x => x.Output)
                                .Returns(new StringWriter());

            mockHttpContextBase.Setup(x => x.Response)
                               .Returns(mockHttpResponseBase.Object);
            mockHttpContextBase.Setup(x => x.Request)
                               .Returns(mockHttpRequestBase.Object);
            mockControllerContext.Setup(x => x.HttpContext)
                                 .Returns(mockHttpContextBase.Object);

            baseController.ControllerContext = mockControllerContext.Object;
        }

在单元测试的方法里面如下方式去使用：

var nameValues = new NameValueCollection
            {
                { "key", "value" }
            };
            _testController.MockControllerContext(requestForm: nameValues);