摩卡+伊斯坦布尔+通天塔 [英] Running Mocha + Istanbul + Babel

问题描述

在使用Mocha和babel编译器运行istanbul时遇到一些问题.

I'm having some issues while running istanbul with mocha and the babel compiler..

我所有的测试都运行良好，但是在完成所有测试后，它向我显示以下消息:

all my tests are runnning just fine, but after all the tests done it shows me this message:

No coverage information was collected, exit without writing coverage information

并且它没有生成任何覆盖率报告.

And it is not producing any coverage report..

我正在运行的命令是:

NODE_ENV=test istanbul cover _mocha -- --require babel-core/register --recursive

该项目托管在github中: https://github.com/weslleyaraujo/react-flux-puzzle/tree/feat/unit-tests-24

the project is hosted in github: https://github.com/weslleyaraujo/react-flux-puzzle/tree/feat/unit-tests-24

有什么想法吗?

推荐答案

使用Babel 6.x，假设我们有文件test/pad.spec.js:

Using Babel 6.x, let's say we have file test/pad.spec.js:

import pad from '../src/assets/js/helpers/pad';
import assert from 'assert';

describe('pad', () => {
  it('should pad a string', () => {
    assert.equal(pad('foo', 4), '0foo');
  });
});

安装一堆废话:

$ npm install babel-istanbul babel-cli babel-preset-es2015 mocha

创建一个.babelrc:

{
  "presets": ["es2015"]
}

运行测试:

$ node_modules/.bin/babel-node node_modules/.bin/babel-istanbul cover \   
node_modules/.bin/_mocha -- test/pad.spec.js


  pad
    ✓ should pad a string


  1 passing (8ms)

=============================================================================
Writing coverage object [/Volumes/alien/projects/forked/react-flux-puzzle/coverage/coverage.json]
Writing coverage reports at [/Volumes/alien/projects/forked/react-flux-puzzle/coverage]
=============================================================================

=============================== Coverage summary ===============================
Statements   : 100% ( 4/4 )
Branches     : 66.67% ( 4/6 ), 1 ignored
Functions    : 100% ( 1/1 )
Lines        : 100% ( 3/3 )
================================================================================

更新:我已经成功使用nyc(消耗istanbul)而不是istanbul/babel-istanbul了.这有点复杂.尝试一下:

UPDATE: I've had success using nyc (which consumes istanbul) instead of istanbul/babel-istanbul. This is somewhat less complicated. To try it:

安装内容(您可以删除babel-istanbul和babel-cli):

Install stuff (you can remove babel-istanbul and babel-cli):

$ npm install babel-core babel-preset-es2015 mocha nyc

如上所述创建.babelrc.

执行此操作:

$ node_modules/.bin/nyc --require babel-core/register node_modules/.bin/mocha \ 
test/pad.spec.js

...这应该会给您类似的结果.默认情况下，它将覆盖范围信息放入.nyc-output/，并在控制台中打印漂亮的文本摘要.

...which should give you similar results. By default, it puts coverage info into .nyc-output/, and prints a nice text summary in the console.

注意:将命令放在package.json的scripts字段中时，可以从任何这些命令中删除node_modules/.bin/.

Note: You can remove node_modules/.bin/ from any of these commands when placing the command in package.json's scripts field.

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