Angular2单元测试。“NPM测试”只成功运行一次，不会再成功运行

Question

[1] Chrome 53.0.2785 (Windows 10 0.0.0) LOG: Error{originalErr: Error{}}
[1]
    Chrome 53.0.2785 (Windows 10 0.0.0): Executed 0 of 4 SUCCESS (0 secs / 0 secs)
[1] Missing error handler on `socket`.
[1] TypeError: Cannot set property '49007121' of null
[1]     at createHtmlResults (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:57:32)
[1]     at initializeHtmlForBrowser (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:78:5)
[1]     at HTMLReporter.onBrowserStart (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:91:5)
[1]     at Server.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitTwo (events.js:111:20)
[1]     at Server.emit (events.js:191:7)
[1]     at Browser.onStart (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\browser.js:126:13)
[1]     at Socket.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitOne (events.js:101:20)
[1]     at Socket.emit (events.js:188:7)
[1]     at Socket.onevent (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\socket.js:335:8)
[1]     at Socket.onpacket (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\socket.js:295:12)
[1]     at Client.ondecoded (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\client.js:193:14)
[1]     at Decoder.Emitter.emit (C:\Projects\Tmp\ng-karma-test\node_modules\component-emitter\index.js:134:20)
[1]     at Decoder.add (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io-parser\index.js:247:12)
[1]     at Client.ondata (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\client.js:175:18)
    Chrome 53.0.2785 (Windows 10 0.0.0) ERROR
[1]   Disconnectedundefined
    Chrome 53.0.2785 (Windows 10 0.0.0): Executed 0 of 4 DISCONNECTED (5.004 secs / 0 secs)
[1] 18 09 2016 18:34:21.946:ERROR [karma]: TypeError: Cannot read property '49007121' of null
[1]     at HTMLReporter.onBrowserComplete (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:95:23)
[1]     at Server.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitOne (events.js:101:20)
[1]     at Server.emit (events.js:188:7)
[1]     at Timeout._onTimeout (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\browser.js:166:17)
[1]     at tryOnTimeout (timers.js:232:11)
[1]     at Timer.listOnTimeout (timers.js:202:5)
[1] karma start karma.conf.js exited with code 1

Answer 1

我今天一直在面对这个问题。它似乎发生在存在需要修复的基础错误时。到目前为止，我还没有无法修复我的错误，所以这可能不能完全解决您的问题。

如果在karma.conf.js文件中添加/更改这些设置，您应该能够在运行测试时看到导致错误的原因：

config.set({
    ...
    autoWatch: false,
    singleRun: true
});

这也应该防止当错误发生时业力退出。