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Clarify that this.something is not available in Jest (docs)

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Winnie Hellmann 2019-06-25 15:37:41 +00:00 committed by Marcia Ramos
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doc/development/testing_guide/frontend_testing.md
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@ -32,6 +32,9 @@ we need to solve before being able to use Jest for all our needs.
The aliases used by Jest are defined in its [own config](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/jest.config.js).
- All calls to `setTimeout` and `setInterval` are mocked away. See also [Jest Timer Mocks](https://jestjs.io/docs/en/timer-mocks).
- `rewire` is not required because Jest supports mocking modules. See also [Manual Mocks](https://jestjs.io/docs/en/manual-mocks).
- No [context object](https://jasmine.github.io/tutorials/your_first_suite#section-The_%3Ccode%3Ethis%3C/code%3E_keyword) is passed to tests in Jest.
This means sharing `this.something` between `beforeEach()` and `it()` for example does not work.
Instead you should declare shared variables in the context that they are needed (via `const` / `let`).
- The following will cause tests to fail in Jest:
- Unmocked requests.
- Unhandled Promise rejections.