Jest beforeAll() 在多个测试文件之间共享 [英] Jest beforeAll() share between multiple test files

问题描述

我有一个 Node.js 项目，正在使用 Jest 进行测试.我有几个具有相同设置要求的测试文件.以前，所有这些测试都在一个文件中，所以我只有一个 beforeAll(...) 来执行通用设置.现在，随着测试分成多个文件，似乎我必须将 beforeAll(...) 代码复制/粘贴到每个文件中.这似乎不雅 - 有没有更好的方法来做到这一点，理想情况下，我可以只编写一次 beforeAll(...)/setup 逻辑，然后从多个测试文件中要求"它?请注意，我的测试套件中还有其他测试不需要此设置功能，因此我不想让所有我的测试运行此设置(只是测试文件的特定子集).

I have a Node.js project that I'm testing using Jest. I have several test files that have the same setup requirement. Previously, all these tests were in one file, so I just had a beforeAll(...) that performed the common setup. Now, with the tests split into multiple files, it seems like I have to copy/paste that beforeAll(...) code into each of the files. That seems inelegant - is there a better way to do this, ideally where I can just write my beforeAll(...)/setup logic once, and "require" it from multiple test files? Note that there are other tests in my test suite that don't require this setup functionality, so I don't want to make all my tests run this setup (just a particular subset of test files).

推荐答案

如果您使用 Jest >=20，您可能需要考虑为测试创建自定义 jest-environment需要这种通用设置.这将是一个扩展 jest-environment-node 或 jest-environment-jsdom 的模块，并实现 async setup(), async teardown() 和 async runScript() 来完成这个设置工作.

If you're using Jest >=20, you might want to look into creating a custom jest-environment for the tests that require this common setup. This would be a module that extends either jest-environment-node or jest-environment-jsdom, and implements async setup(), async teardown(), and async runScript() to do this setup work.

然后，您可以向需要此设置的文件添加 @jest-environment my-custom-env 指令.

You can then add a @jest-environment my-custom-env directive to those files that require this setup.

请参阅 Jest 配置文档以了解 testEnvironment 有关如何设置的详细信息；那里有一个简单的例子.

See the Jest config docs for testEnvironment for details on how to set this up; there's a simple example there.

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