How to Mock HttpContext.Current in ASP.NET Test Initialization Methods?

Mock HttpContext.Current in ASP.NET test initialization method

In ASP.NET, mocking the HttpContext object is a common method for testing controllers in isolation. However, there are situations where the base test class initializes external libraries that try to access HttpContext.Current. If the HttpContext is not mocked correctly in the test initialization method, an error will result.

Solution to simulate HttpContext in initialization method

To solve this problem, there is no need to mock HttpContextBase as it has nothing to do with HttpContext.Current. Instead, you can mock the HttpContext directly and set it as the current context:

<code class="language-csharp">// 在测试初始化方法中
HttpContext.Current = new HttpContext(
    new HttpRequest("", "http://tempuri.org", ""),
    new HttpResponse(new StringWriter())
);</code>

You can then set the User property to impersonate the logged in user:

<code class="language-csharp">// 用户已登录
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity("username"),
    new string[0]
);

// 用户已注销
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity(String.Empty),
    new string[0]
);</code>

Using this approach ensures that HttpContext.Current is mocked throughout the test class, including the initialization method and any libraries that access it. This way you can test controller actions that rely on the HttpContext property while also initializing dependencies that require access to the HttpContext.

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