一个文件中的测试是否在 Jest 中并行运行? [英] Are tests inside one file run in parallel in Jest?

问题描述

文档中的 Jest 状态:Jest 虚拟化 JavaScript 环境并在工作进程中并行运行测试."

Jest states in docs: "Jest virtualizes JavaScript environments and runs tests in parallel across worker processes."

但是对于一个文件中的多个测试，它们是并行运行还是仅适用于测试文件呢?我可以假设一个文件中的测试按出现顺序和串行运行吗?

But what about multiple tests inside one file, do they run in parallel or this statement applies just to the test files? Can I assume that tests in one file run in order of appearance and in serial?

推荐答案

是的，您可以放心地假设单个文件中的测试将按出现的顺序运行.您可以通过在每个 it 块中放置一个 console.log 来证明这一点.

Yes, you can safely assume tests inside a single file will run in the order of appearance. You could prove this by putting a console.log in each it block.

可能值得一提的是，依赖执行顺序/外部状态通常是不好的做法……而且您永远不会知道，Jest(或当前的底层测试运行程序 Jasmine)可能会决定以随机顺序运行它们在较新的版本中.

It's probably worth mentioning that it's generally bad practice to rely on the order of execution / external state...and you never know, Jest (or the current underlying test runner, Jasmine) may decide to run them in a random order in a newer version.

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