Running ng test in windows fails with EMFILE error

@wardbell

Running ng test on Windows, with admin permissions, on a newly generated project fails with a Error: EMFILE: too many open files error.

Running ng serve and ng test --build=false in separate works though.

/cc @wardbell

OS: Windows 10

$ ng --version
angular-cli: 1.0.0-beta.5
node: 5.11.1
os: win32 x64

Reproduction steps:

ng new project
cd project
ng test

Result:

filipe.silva@DESKTOP-7ND6T3R MINGW64 /E/dev/testing/project (master)
$ ng test
Built project successfully. Stored in "dist/".
\ BuildingThe Broccoli Plugin: [BroccoliTypeScriptCompiler] failed with:
Error: EMFILE: too many open files, open 'E:\dev\testing\project\tmp\broccoli_type_script_compiler-input_base_path-sdKfbqXb.tmp\0\src\tsconfig.json'
    at Error (native)
    at Object.fs.openSync (fs.js:584:18)
    at Object.fs.readFileSync (fs.js:431:33)
    at BroccoliTypeScriptCompiler._loadTsConfig (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:123:34)
    at BroccoliTypeScriptCompiler._createServiceHost (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:158:25)
    at BroccoliTypeScriptCompiler.build (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:41:12)
    at C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-caching-writer\index.js:152:21
    at lib$rsvp$$internal$$tryCatch (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1198:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

The broccoli plugin was instantiated at:
    at BroccoliTypeScriptCompiler.Plugin (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-plugin\index.js:10:31)
    at BroccoliTypeScriptCompiler.CachingWriter [as constructor] (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-caching-writer\index.js:21:10)
    at BroccoliTypeScriptCompiler (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:26:49)
    at Angular2App._getTsTree (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:321:18)
    at Angular2App._buildTree (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:116:23)
    at new Angular2App (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:53:23)
    at module.exports (E:\dev\testing\project\angular-cli-build.js:6:10)
    at Class.module.exports.Task.extend.setupBroccoliBuilder (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\models\builder.js:55:19)
    at Class.module.exports.Task.extend.init (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\models\builder.js:89:10)
    at new Class (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\core-object\core-object.js:18:12)
    at Class.module.exports.Task.extend.run (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\tasks\build-watch.js:17:16)
    at C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\addon\ng2\commands\test.js:69:46
    at lib$rsvp$$internal$$tryCatch (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1198:9)


The Broccoli Plugin: [BroccoliTypeScriptCompiler] failed with:
Error: EMFILE: too many open files, open 'E:\dev\testing\project\tmp\broccoli_type_script_compiler-input_base_path-sdKfbqXb.tmp\0\src\tsconfig.json'
    at Error (native)
    at Object.fs.openSync (fs.js:584:18)
    at Object.fs.readFileSync (fs.js:431:33)
    at BroccoliTypeScriptCompiler._loadTsConfig (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:123:34)
    at BroccoliTypeScriptCompiler._createServiceHost (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:158:25)
    at BroccoliTypeScriptCompiler.build (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:41:12)
    at C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-caching-writer\index.js:152:21
    at lib$rsvp$$internal$$tryCatch (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1198:9)
    at _combinedTickCallback (internal/process/next_tick.js:67:7)
    at process._tickCallback (internal/process/next_tick.js:98:9)

The broccoli plugin was instantiated at:
    at BroccoliTypeScriptCompiler.Plugin (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-plugin\index.js:10:31)
    at BroccoliTypeScriptCompiler.CachingWriter [as constructor] (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\broccoli-caching-writer\index.js:21:10)
    at BroccoliTypeScriptCompiler (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\broccoli-typescript.js:26:49)
    at Angular2App._getTsTree (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:321:18)
    at Angular2App._buildTree (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:116:23)
    at new Angular2App (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\lib\broccoli\angular2-app.js:53:23)
    at module.exports (E:\dev\testing\project\angular-cli-build.js:6:10)
    at Class.module.exports.Task.extend.setupBroccoliBuilder (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\models\builder.js:55:19)
    at Class.module.exports.Task.extend.init (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\models\builder.js:89:10)
    at new Class (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\core-object\core-object.js:18:12)
    at Class.module.exports.Task.extend.run (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\angular-cli\lib\tasks\build-watch.js:17:16)
    at C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\addon\ng2\commands\test.js:69:46
    at lib$rsvp$$internal$$tryCatch (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1036:16)
    at lib$rsvp$$internal$$invokeCallback (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1048:17)
    at lib$rsvp$$internal$$publish (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1019:11)
    at lib$rsvp$asap$$flush (C:\Users\filipe.silva\AppData\Roaming\nvm\v5.11.1\node_modules\angular-cli\node_modules\rsvp\dist\rsvp.js:1198:9)

Yup, same error as Ward's.

My question is: If ng serve builds the project succesfully, why ng test doesn't? Are they building in a different way?

They might, yes. Investigating.

Possibly related: angular/angular#4525

The explanation for why ng test fails but serving and testing works seems to be that individual processes have a file descriptor limit (see http://stackoverflow.com/questions/31932729/open-too-many-files-emfile-error-in-windows-7). Thus running in separate doubles the file limit.

Further investigation shows that the problem occurs because of karma serving the files in dist/vendor/.

Effectively, the process is watching those files files twice - once for rebuilding them and once for testing them.

I don't have a solution for this at the moment.

FYI, I changed my "test" npm-script to:
ng build && ng test --build=false

That's a good workaround until this is fixed.

workaround: Running `ng test` in windows fails with EMFILE error

@JohannesHoppe

@JohannesHoppe your solution is better than the one I put up in https://github.com/angular/angular-cli/pull/991/files. Would you be interested in making a PR replacing my warning?

Sure, I'll do that. 😄

I think it should be ng build && ng test --build=false --watch=false. There isn't much point keeping the tester in watch mode if the sources don't rebuild.

I still think separate ng serve + ng test processes are good for running tests in watch mode whereas the npm script change is better for running it once.

fixing broken unit test, applying bugfix for windows, see angular/ang…

Updated npm test task to avoid issues on windows. See: angular/angula…

@JohannesHoppe

@JohannesHoppe your workaround works but only when running
>npm run test
Do you know how to achieve the same when running ?
>ng test

@filipesilva I tried to dig into angular-cli code but didn't found where it was specified :(

FYI

>ng --version
angular-cli: 1.0.0-beta.8
node: 6.2.1
os: win32 x64

Issue made obsolete by #1455.

YES!!! Webpack awesome thanks! Just ran into this this morning

applying temp unit-test bugfix for windows (this should be resolved b…

I also have this issue and on Win10 and using ng test --watch=false as a workaround

please guys, i am trying to run an ng test and i am getting the following error
Missing 'angularCli.config' entry in Karma config
Error: Missing 'angularCli.config' entry in Karma config

at init (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\angular-cli\plugins\karma.js:9:11)
at Array.invoke (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\di\lib\injector.js:75:15)
at Injector.get (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\di\lib\injector.js:48:43)
at C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\karma\lib\server.js:138:20
at Array.forEach (native)
at Server._start (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\karma\lib\server.js:137:21)
at Injector.invoke (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\di\lib\injector.js:75:15)
at Server.start (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\karma\lib\server.js:102:18)
at C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\angular-cli\tasks\test.js:30:25
at Class.run (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\angular-cli\tasks\test.js:15:16)
at Class.run (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\angular-cli\commands\test.js:29:25)
at Class.<anonymous> (C:\Users\Chisom\Documents\GitHub\OryxMCIv2\src\OryxMCI_web\node_modules\angular-cli\angular-cli\lib\models\command.js:152:17)
at process._tickCallback (internal/process/next_tick.js:103:7)

here is my karma.config
module.exports = function (config) {
config.set({
basePath: '',
frameworks: ['jasmine', 'angular-cli'],
plugins: [
require('karma-jasmine'),
require('karma-chrome-launcher'),
require('karma-remap-istanbul'),
require('angular-cli/plugins/karma')
],
files: [
{ pattern: './src/test.ts', watched: false }
],
preprocessors: {
'./src/test.ts': ['angular-cli']
},
remapIstanbulReporter: {
reports: {
html: 'coverage',
lcovonly: './coverage/coverage.lcov'
}
},
angularCliConfig: './angular-cli.json',
angularCli: {
config: './angular-cli.json',
environment: 'dev'
},
reporters: ['progress', 'karma-remap-istanbul'],
port: 9876,
colors: true,
logLevel: config.LOG_INFO,
autoWatch: true,
browsers: ['Chrome'],
singleRun: false
});
};

please any work-around, i am desperate here.

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Running `ng test` in windows fails with EMFILE error #977

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Running ng test in windows fails with EMFILE error #977

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Foxandxss commented on Jun 1, 2016

filipesilva commented on Jun 1, 2016

filipesilva commented on Jun 1, 2016

filipesilva commented on Jun 1, 2016

filipesilva commented on Jun 1, 2016

JohannesHoppe commented on Jun 12, 2016

filipesilva commented on Jun 18, 2016

JohannesHoppe commented on Jun 18, 2016

Blasz commented on Jun 19, 2016

francisoud commented on Jul 11, 2016

filipesilva commented on Jul 27, 2016

comfroels commented on Jul 27, 2016

willi84 commented on Sep 14, 2016

Marianogboo commented on Nov 24, 2016

angular-automatic-lock-bot commented on Sep 6, 2019

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Running `ng test` in windows fails with EMFILE error #977