Karma Skill

lambdatest/karma-skill

> Generates Karma test runner configurations for browser-based JavaScript testing. Works with Jasmine, Mocha, or QUnit. Use when user mentions "Karma", "karma test runner", "browser-based JS test".

7k tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

343

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/LambdaTest/agent-skills --skill karma-skill

The instruction itself

9 sections, as written by the author

Karma Testing Skill

Core Patterns

karma.conf.js

module.exports = function(config) {
  config.set({
    basePath: '',
    frameworks: ['jasmine'],
    files: [
      'src/**/*.js',
      'test/**/*.spec.js'
    ],
    preprocessors: {
      'src/**/*.js': ['coverage']
    },
    reporters: ['progress', 'coverage'],
    coverageReporter: {
      type: 'html',
      dir: 'coverage/'
    },
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: ['Chrome', 'Firefox'],
    singleRun: false,
    concurrency: Infinity,

    // LambdaTest cloud browsers
    customLaunchers: {
      ChromeLT: {
        base: 'WebDriver',
        config: {
          hostname: 'hub.lambdatest.com',
          port: 80
        },
        browserName: 'Chrome',
        version: 'latest',
        name: 'Karma Test',
        tunnel: true,
        user: process.env.LT_USERNAME,
        accessKey: process.env.LT_ACCESS_KEY
      }
    }
  });
};

Test with Jasmine Framework

describe('StringUtils', () => {
  it('should capitalize first letter', () => {
    expect(StringUtils.capitalize('hello')).toBe('Hello');
  });

  it('should handle empty string', () => {
    expect(StringUtils.capitalize('')).toBe('');
  });
});

Angular Integration

// karma.conf.js for Angular
frameworks: ['jasmine', '@angular-devkit/build-angular'],
plugins: [
  require('karma-jasmine'),
  require('karma-chrome-launcher'),
  require('karma-coverage'),
  require('@angular-devkit/build-angular/plugins/karma')
],

Setup: `npm install karma karma-jasmine karma-chrome-launcher karma-coverage --save-dev`

Run: `npx karma start` or `npx karma start --single-run`

Init: `npx karma init karma.conf.js`

Deep Patterns

See reference/playbook.md for production-grade patterns:

| Section | What You Get |

|---------|-------------|

| §1 Production Configuration | Full karma.conf.js with coverage thresholds, reporters, CI launchers |

| §2 Component Testing | Service mocking, DOM interaction, form validation patterns |

| §3 HTTP Service Testing | HttpTestingController, error handling, retry testing |

| §4 Directive & Pipe Testing | Host component pattern, custom pipes with edge cases |

| §5 RxJS & Async Patterns | debounceTime, switchMap cancellation, subscription cleanup |

| §6 Router & NgRx Testing | RouterTestingModule, MockStore, selector overrides |

| §7 LambdaTest Integration | Cloud browser configuration for cross-browser testing |

| §8 CI/CD Integration | GitHub Actions with coverage, test reporting |

| §9 Debugging Table | 12 common problems with causes and fixes |

| §10 Best Practices | 14-item checklist for production Angular testing |

How to use it

Copy the folder

Take lambdatest/karma-skill from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.

Install what it needs

The instructions reference npm, npx. Without those the skill loads but fails at the first command.