Testing HTTP Requests in Elixir with Req.Test

The article discusses how to effectively test HTTP requests in Elixir applications using the Req HTTP client and its testing features found in Req.Test. It details the process of writing tests that inspect and assert both headers and JSON body content of requests, eliminating the need for actual network calls and ensuring that tests are fast and reliable. The author provides an example function that sends a JSON payload and shows how to use Req.Test to intercept the request via a custom plug. Key points include how to retrieve the request body from the connection struct and a proposed helper function to streamline reading the request body. The conclusion emphasizes the benefits of this testing strategy for maintaining reliable and introspective tests.