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npm run testするときはnpmログを切ったほうがいい

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結論

npm run test --silent

背景

vue init webpackコマンドによってプロジェクトを作成し、インストールしていくと(テスト関連のインストールを無効にしてなければ)、karmaによる単体テストとnightwatchによるE2Eテストがインストールされます。
テストはそれぞれ、npm run unitnpm run e2eで実行でき、npm run testを使うと両方連続で実行できます。

しかし、テスト結果にエラーがあると結果の後に以下のような表示がでてしまいます。

npm ERR! Windows_NT 10.0.15063
npm ERR! argv "C:\\Program Files (x86)\\Nodist\\v-x64\\8.2.1\\node.exe" "C:\\Program Files (x86)\\Nodist\\npmv\\4.0.5\\bin\\npm-cli.js" "run" "unit"
npm ERR! node v8.2.1
npm ERR! npm  v4.0.5
npm ERR! code ELIFECYCLE
npm ERR! vue@1.0.0 unit: `cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vue@1.0.0 unit script 'cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the vue package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     cross-env BABEL_ENV=test karma start test/unit/karma.conf.js --single-run
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs vue
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls vue
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\xampp\htdocs\vue\npm-debug.log

npm ERR! Windows_NT 10.0.15063
npm ERR! argv "C:\\Program Files (x86)\\Nodist\\v-x64\\8.2.1\\node.exe" "C:\\Program Files (x86)\\Nodist\\npmv\\4.0.5\\bin\\npm-cli.js" "run" "test"
npm ERR! node v8.2.1
npm ERR! npm  v4.0.5
npm ERR! code ELIFECYCLE
npm ERR! vue@1.0.0 test: `npm run unit && npm run e2e`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the vue@1.0.0 test script 'npm run unit && npm run e2e'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the vue package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run unit && npm run e2e
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs vue
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls vue
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     C:\xampp\htdocs\vue\npm-debug.log

npm ERR!ってでてるのでシステムエラーかとも思うんですが、よく見るとテストのコマンドのところで、Exit status 1ってなっているのが原因のようです。
まあ、テスト失敗してるんだからExit status 1 でいいのではないかと思います。
そう考えると、この表示が邪魔。

そういう時は--silentオプションをつけるとnpmのログを切れます。
成功してた時に出てた余計なWARNINGとかも消えて表示がすっきりします。

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