为什么“gulp test”会运行两次测试？答案

【问题标题】：Why "gulp test" runs the tests twice?为什么“gulp test”会运行两次测试？
【发布时间】：2015-04-03 11:32:13
【问题描述】：

我有以下设置：

package.json

"scripts": {
  "test": "jest"
}

gulpfile.js

gulp.task('test', shell.task('npm test'));

当我运行 npm test 时，它会运行一次测试并停止。

但是，运行 gulp test 会导致运行测试两次。请参阅下面的日志。

为什么会发生这种情况，您将如何解决？

日志：

$ gulp test
[14:12:28] Using gulpfile e:\react-playground\gulpfile.js
[14:12:28] Starting 'test'...

> react-playground@1.0.0 test e:\react-playground
> jest

Using Jest CLI v0.2.2
Waiting on 1 test...
 FAIL  search-panel\questions\__tests__\questions-test.js (1.145s)
● Questions › it should render content
  - Expected: 'Hi! Questions here' toEqual: 'Hi! Questions here2'
        at new jasmine.ExpectationResult (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:115:32)
        at null.toEqual (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:1236:29)
        at Spec.<anonymous> (e:\react-playground\src\search-panel\questions\__tests__\questions-test.js:14:55)
        at jasmine.Block.execute (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:1065:17)
        at jasmine.Queue.next_ (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:2098:31)
        at null._onTimeout (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:2088:18)
        at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)
1 test failed, 0 tests passed (1 total)
Run time: 1.416s
npm ERR! Test failed.  See above for more details.
npm[14:12:30] 'test' errored after 2.32 s
[14:12:30] Error in plugin 'gulp-shell'
Message:
    Command failed: npm ERR! Test failed.  See above for more details.
npm
Details:
    killed: false
    code: 1
    signal: null
    stdout:
> react-playground@1.0.0 test e:\react-playground
> jest

Using Jest CLI v0.2.2
Waiting on 1 test...
 FAIL  search-panel\questions\__tests__\questions-test.js (1.145s)
● Questions › it should render content
  - Expected: 'Hi! Questions here' toEqual: 'Hi! Questions here2'
        at new jasmine.ExpectationResult (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:115:32)
        at null.toEqual (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:1236:29)
        at Spec.<anonymous> (e:\react-playground\src\search-panel\questions\__tests__\questions-test.js:14:55)
        at jasmine.Block.execute (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:1065:17)
        at jasmine.Queue.next_ (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:2098:31)
        at null._onTimeout (e:\react-playground\node_modules\jest-cli\vendor\jasmine\jasmine-1.3.0.js:2088:18)
        at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)
1 test failed, 0 tests passed (1 total)
Run time: 1.416s

    stderr: npm ERR! Test failed.  See above for more details.
npm

【问题讨论】：

在我看来测试运行了一次，然后由于脚本失败，npm 报告了标准输出和标准错误。请注意括号中标记的时间戳。另请注意，报告的“运行时间”在两个输出中完全相同。如果测试运行不止一次，我不会想到。
@RandyMorris 我试过gulp test 2>/dev/null，但没有帮助。我开始怀疑gulp-shell，因为日志中的这一行：“插件'gulp-shell'中的错误”。任何想法如何解决这个问题？

标签： npm gulp jestjs gulp-shell

【解决方案1】：

看起来问题是gulp-shell 第二次输出错误。这解决了问题：

gulp.task('test', shell.task('npm test', { ignoreErrors: true }));

【讨论】：

注意：gulp-shell 是blacklisted
@Heikki 感谢您的评论！