node.js Mocha 代码覆盖率
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Code coverage with Mocha
提问by tusharmath
I am using Mocha for testing my NodeJS application. I am not able to figure out how to use its code coverage feature. I tried googling it but did not find any proper tutorial. Please help.
我正在使用 Mocha 来测试我的 NodeJS 应用程序。我不知道如何使用它的代码覆盖功能。我尝试使用谷歌搜索它，但没有找到任何合适的教程。请帮忙。
回答by Dan Kohn
You need an additional library for code coverage, and you are going to be blown away by how powerful and easy istanbulis. Try the following, after you get your mocha tests to pass:
你需要一个额外的代码覆盖库，你会被伊斯坦布尔的强大和简单所震撼。在您通过 mocha 测试后，请尝试以下操作：
npm install nyc
Now, simply place the command nyc in front of your existing test command, for example:
现在，只需将命令 nyc 放在现有测试命令的前面，例如：
{
"scripts": {
"test": "nyc mocha"
}
}
回答by lifeisfoo
Now (2020) the preferred way to use istanbulis via its "state of the art command line interface"nyc.
现在（2020 年）使用istanbul的首选方式是通过其“最先进的命令行界面” nyc。
Setup
设置
First, install it in your project with
首先，将它安装在您的项目中
npm i nyc --save-dev
Then, if you have a npm based project, just change the test script inside the scriptsobject of your package.jsonfile to execute code coverage of your mochatests:
然后，如果您有一个基于 npm 的项目，只需更改package.json文件scripts对象内的测试脚本即可执行mocha测试的代码覆盖率：
{
"scripts": {
"test": "nyc --reporter=text mocha"
}
}
Run
跑
Now run your tests
现在运行你的测试
npm test
and you will see a table like this in your console, just after your tests output:
您将在控制台中看到这样的表格，就在您的测试输出之后：
Customization
定制
Html report
html报告
Just use
只需使用
nyc --reporter=html
instead of text. Now it will produce a report inside ./coverage/index.html.
而不是text. 现在它会在里面产生一个报告./coverage/index.html。
Report formats
报告格式
Istanbul supports a wide range of report formats. Just look at its reports libraryto find the most useful for you.
Just add a --reporter=REPORTER_NAMEoption for each format you want.
For example, with
伊斯坦布尔支持多种报告格式。只需查看其报告库即可找到对您最有用的报告。只需--reporter=REPORTER_NAME为您想要的每种格式添加一个选项。例如，与
nyc --reporter=html --reporter=text
you will have both the console and the html report.
您将同时拥有控制台和 html 报告。
Don't run coverage with npm test
不要使用 npm test 运行覆盖率
Just add another script in your package.jsonand leave the testscript with only your test runner (e.g. mocha):
只需在您的脚本中添加另一个脚本，并将脚本package.json保留在test您的测试运行器中（例如 mocha）：
{
"scripts": {
"test": "mocha",
"test-with-coverage": "nyc --reporter=text mocha"
}
}
Now run this custom script
现在运行这个自定义脚本
npm run test-with-coverage
to run tests with code coverage.
以代码覆盖率运行测试。
Force test failing if code coverage is low
如果代码覆盖率低，则强制测试失败
Fail if the total code coverage is below 90%:
如果总代码覆盖率低于 90%，则失败：
nyc --check-coverage --lines 90
Fail if the code coverage of at least one file is below 90%:
如果至少一个文件的代码覆盖率低于 90%，则失败：
nyc --check-coverage --lines 90 --per-file
回答by jsan
Blanket.js works perfect too.
Blanket.js 也很完美。
npm install --save-dev blanket
npm install --save-dev blanket
in front of your test/tests.js
在你的 test/tests.js 前面
require('blanket')({
pattern: function (filename) {
return !/node_modules/.test(filename);
}
});
run mocha -R html-cov > coverage.html
跑 mocha -R html-cov > coverage.html
