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Merge branch 'winh-jest-webpack-docs' into 'master' 

Clarify that Jest does not use Webpack (docs)

See merge request gitlab-org/gitlab-ce!30000
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Marcia Ramos 2019-06-25 15:28:34 +00:00
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doc/development/testing_guide/frontend_testing.md
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@ -28,6 +28,8 @@ we need to solve before being able to use Jest for all our needs.
- Jest runs in a Node.js environment, not in a browser. Support for running Jest tests in a browser [is planned](https://gitlab.com/gitlab-org/gitlab-ce/issues/58205).
- Because Jest runs in a Node.js environment, it uses [jsdom](https://github.com/jsdom/jsdom) by default.
- Jest does not have access to Webpack loaders or aliases.
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).
- The following will cause tests to fail in Jest: