Every application should be well tested. Actix Web provides tools to perform integration tests against your applications and unit test tools for custom extractors and middleware.
Actix Web provides a request builder type. [_TestRequest_][testrequest] implements a builder-like pattern. You can generate a `HttpRequest` instance with `to_http_request()` and call your handlers or extractors with it. Also see
If you need more complex application configuration, testing should be very similar to creating the normal application. For example, you may need to initialize application state. Create an `App` with a `data` method and attach state just like you would from a normal application.
If you need to test stream generation, it would be enough to call [`into_parts()`][resintoparts] and convert the resulting body into a future and execute it, for example when testing [_Server Sent Events_][serversentevents].
Unit testing has pretty limited value for applications, but can be useful when developing extractors, middleware, and responders. Given that, calling directly into handler functions **which are defined stand-alone, without using routing macros** (like `#[get("/")]`) is possible if you want to make assertions on custom `Responder`s.
