Set default launcher flags when I run ng test without additional arguments

Question

I need to pass custom argument to chrome in order to set locale: --lang en-US

I've done it using customLauncher. My src/karma.conf.js:

module.exports = function (config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine', '@angular-devkit/build-angular'],
    plugins: [
      require('karma-jasmine'),
      require('karma-chrome-launcher'),
    ],
    customLaunchers: {
      ChromeHeadlessLang: {
        base: 'ChromeHeadless',
        flags: [
          '--lang en-US', // ensure that the test works on all environments with the same locale
        ]
      }
    },
    browsers: ['Chrome'],
    ...
  });
};

And I can run it using

ng test --browsers ChromeHeadlessLang

However, I would like to use the lang flags by default, without specifying --browsers

ng test

Can I override the default flags, so that they are used when I run just ng test?

@AntonRusak: Sorry, that was a typo in the question. I basically want to make sure that when somebody runs `ng test` it will always use the same language, independent of their local OS or chrome settings — Liero, Oct 24 '19 at 09:06
@Liero did you find the fix? I'm running into a similar issue. — Chris Savory, Feb 02 '20 at 15:03

score 0 · Answer 1 · answered Oct 24 '19 at 09:06

0

You can override the default behavour of any script in your package.json. Just add it to your scripts object like this:

"scripts": {
        "ng": "ng",
        "test": "ng test --watch=false --whateverParamYouWantToAddHere",
    },

answered Oct 24 '19 at 09:06

dave0688

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I know, but most angular developers just run `ng test` not `npm run test`, because that is how the angular docs mentions it. Anyway, it does not answer the question – Liero Oct 24 '19 at 09:09
It depends on what you use as package manager. For `npm` yes you're right. In my project I use `yarn`. You can then directly call `yarn test` and it will execute the script from `package.json`. Unfortunately `npm` is a bit dumb in that sense. – dave0688 Oct 24 '19 at 09:13

score 0 · Answer 2 · answered May 11 '22 at 09:44

You can specify default values for all parameters of ng test inside angular.json

e.g.:

 "test": {
          "builder": "ngx-build-plus:karma",
          "options": {
            "codeCoverageExclude": ["src/*.ts"],
            "codeCoverage": true,

All available parameters: https://angular.io/cli/test

Set default launcher flags when I run ng test without additional arguments

2 Answers2