Many have experience with generic automated tests with Puppeteer. This is mostly about imitating user behavior on web pages and asserting results. But what if you need to test representation of errored state, which you cannot (or don’t know how to) trigger by a user action? For example, we have a form. When user submits the app sends a POST request to the server and shows success messages as soon as the server responds with 200 OK. That is the expected behavior. Yet, in real world the server may happened to be down or respond with Internal Error. Imagine the app covers gratefully this case. But how we would reproduce it with Puppeteer?
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