如何使用Jest获取代码覆盖率报告? [英] How to get the code coverage report using Jest?

问题描述

是否有一种方法可以在基于Jasmine的JavaScript Jest测试框架中进行代码覆盖?

Is there a way to have code coverage in the JavaScript Jest testing framework, which is built on top of Jasmine?

内部框架不会打印得出它的代码覆盖率.我也尝试使用伊斯坦布尔， JSCover ，但都没有工作.

The internal framework does not print out the code coverage it gets. I've also tried using Istanbul, blanket, and JSCover, but none of them work.

推荐答案

使用 Jest 21.2.1 时，我可以在命令行中查看代码覆盖率，并通过传递来创建coverage目录--coverage 到Jest脚本.下面是一些示例:

When using Jest 21.2.1, I can see code coverage at the command line and create a coverage directory by passing --coverage to the Jest script. Below are some examples:

我倾向于在本地安装Jest，在这种情况下，命令可能看起来像这样:

I tend to install Jest locally, in which case the command might look like this:

npx jest --coverage

我假设(尽管尚未确认)，如果我在全球范围内安装Jest，这也将起作用:

I assume (though haven't confirmed), that this would also work if I installed Jest globally:

笑话--coverage

非常稀疏的文档是此处

当我导航到 coverage/lcov-report 目录时，我发现了一个可以加载到浏览器中的 index.html 文件.它包括在命令行上打印的信息，以及其他信息和一些图形输出.

When I navigated into the coverage/lcov-report directory I found an index.html file that could be loaded into a browser. It included the information printed at the command line, plus additional information and some graphical output.

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