Why do we recreate API responses using JEST?

I've been diving into JavaScript testing and have come across some confusion when it comes to mocking API calls. Most tutorials I've seen demonstrate mocking API calls for unit or integration testing, like this one: https://jestjs.io/docs/en/tutorial-async

I'm struggling to see the benefit of mocking a server response with hard-coded data in order to test that data specifically. It feels like these tests only confirm whether a mock was used instead of a real API call. But doesn't this overlook the actual behavior of the application? Am I missing something here?

Furthermore, if I wanted to test the result of a genuine API call, would that fall under functional testing? Can tools like Jest handle testing real API calls, or would Selenium or TestCafe be more suitable for this task?

javascriptseleniumtestingjestjsweb-api-testing

Answer №1

To verify a call to an actual API from a frontend application, TestCafe provides Request Hooks that allow you to validate the correct execution of the API call and confirm that the response contains accurate data.

Simulating an API Response can be useful for conducting chaos testing scenarios: such as observing how the frontend behaves when the API returns various HTTP status codes like 500, 400, 404, 202, or even if it fails to respond at all.

Answer №2

The outcome doesn't provide insight into the actions of your application, does it?

Of course it does. It indicates that your front end component successfully managed the data it received (storing it in a redux store, localStorage, updating the UI, etc).

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