Add example project for karma

Author: gayanW

.github/workflows/karma.yaml

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+name: karma
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - "karma/**"
+  pull_request:
+    paths:
+      - "karma/**"
+      - .github/workflows/karma.yaml
+
+env:
+  LAUNCHABLE_TOKEN: ${{ secrets.LAUNCHABLE_TOKEN_KARMA }}
+  LAUNCHABLE_DEBUG: 1
+  LAUNCHABLE_REPORT_ERROR: 1
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: karma
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+      - name: Install Launchable CLI
+        run: pip install launchable
+      - name: Launchable verify
+        run: launchable verify
+      - name: Install dependencies
+        run: npm install
+      - name: Record build
+        run: launchable record build --name "$GITHUB_RUN_ID"
+      - name: Save all tests to a file
+        run: find test -name "*.spec.ts" -o -name "*.spec.js" > test_list.txt
+      - name: Run all tests
+        run: |
+          KARMA_FILES=$(cat test_list.txt | jq -R -s -c 'split("\n")[:-1]')
+          npx karma start --single-run
+      - name: Record tests
+        run: launchable record tests karma test-results.json
+      - name: Request subset
+        run: cat test_list.txt | launchable subset --target 25% karma  > subset.txt
+      - name: Run subset of tests
+        run: |
+          KARMA_FILES=$(cat subset.txt | jq -R -s -c 'split("\n")[:-1]')
+          npx karma start --single-run

karma/.gitignore

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+node_modules
+.launchable
+.python-version
+*.txt
+test-results.json
+TESTS.xml

karma/README.md

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+Karma
+======
+
+**Steps taken to create this project:**
+
+```bash
+npm init -y
+npm install --save-dev karma karma-jasmine jasmine-core karma-chrome-launcher karma-json-reporter karma-reports-with-file-paths
+```
+The instructions are based on:
+
+https://karma-runner.github.io/6.4/intro/installation.html
+
+**Generate `karma.conf.js`:**
+```bash
+npx karma init
+
+# Answer the prompts:
+# - Framework: jasmine
+# - Require.js: no
+# - Browser: ChromeHeadless
+# - Test files: 
+# - Files to exclude:
+# - Watch files: no
+```
+
+**Add following to `karma.conf.js` while keeping the current settings:**
+```
+module.exports = function (config) {
+  config.set({
+    files: process.env.KARMA_FILES ? JSON.parse(process.env.KARMA_FILES) : [],
+    ...
+    preprocessors: {
+      '**/*.spec.js': ['reports-with-file-paths']
+    },
+    ...
+    plugins: [
+      ...
+      require('karma-json-reporter'),
+      require('karma-reports-with-file-paths')
+    ],
+    jsonReporter: {
+      outputFile: require('path').join(__dirname, 'test-results.json'),
+      stdout: false
+    },
+    reporters: [..., 'json']
+  });
+};
+```
+
+**Create a test file:**
+```bash
+mkdir test
+
+cat > test/foo.spec.js << 'EOF'
+describe('Foo', function() {
+  it('should pass', function() {
+    expect(true).toBe(true);
+  });
+
+  it('should add numbers', function() {
+    expect(1 + 1).toBe(2);
+  });
+});
+EOF
+```
+
+**Record session:**
+```bash
+git init && git add . && git commit -m "Initial commit"
+launchable record build --name ${BUILD_NAME}
+launchable record session --build ${BUILD_NAME} > session.txt
+```
+
+**Run all tests:**
+```bash
+find test -name "*.spec.ts" -o -name "*.spec.js" > test_list.txt
+KARMA_FILES=$(cat test_list.txt | jq -R -s -c 'split("\n")[:-1]')
+npx karma start --single-run
+```
+
+**Record tests:**
+```bash
+launchable record tests karma test-results.json
+```
+
+**Request subset:**
+```bash
+cat test_list.txt | launchable subset --target 25% karma  > subset.txt
+```
+
+**Run subset of tests:**
+```bash
+KARMA_FILES=$(cat subset.txt | jq -R -s -c 'split("\n")[:-1]')
+npx karma start --single-run
+```

karma/karma.conf.js

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+// Karma configuration
+// Generated on Tue Nov 25 2025 12:14:27 GMT+0900 (Japan Standard Time)
+
+module.exports = function(config) {
+  config.set({
+
+    // base path that will be used to resolve all patterns (eg. files, exclude)
+    basePath: '',
+
+
+    // frameworks to use
+    // available frameworks: https://www.npmjs.com/search?q=keywords:karma-adapter
+    frameworks: ['jasmine'],
+
+
+    // list of files / patterns to load in the browser
+    files: process.env.KARMA_FILES ? JSON.parse(process.env.KARMA_FILES) : [],
+
+
+    // list of files / patterns to exclude
+    exclude: [
+    ],
+
+
+    // preprocess matching files before serving them to the browser
+    // available preprocessors: https://www.npmjs.com/search?q=keywords:karma-preprocessor
+    preprocessors: {
+      '**/*.spec.js': ['reports-with-file-paths']
+    },
+
+
+    plugins: [
+      require('karma-jasmine'),
+      require('karma-chrome-launcher'),
+      require('karma-junit-reporter'),
+      require('karma-json-reporter'),
+      require('karma-reports-with-file-paths')
+    ],
+
+    jsonReporter: {
+      outputFile: require('path').join(__dirname, 'test-results.json'),
+      stdout: false
+    },
+
+    junitReporter: {
+      useBrowserName: false
+    },
+
+    // test results reporter to use
+    // possible values: 'dots', 'progress'
+    // available reporters: https://www.npmjs.com/search?q=keywords:karma-reporter
+    reporters: ['progress', 'json', 'junit'],
+
+
+    // web server port
+    port: 9876,
+
+
+    // enable / disable colors in the output (reporters and logs)
+    colors: true,
+
+
+    // level of logging
+    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
+    logLevel: config.LOG_INFO,
+
+
+    // enable / disable watching file and executing tests whenever any file changes
+    autoWatch: false,
+
+
+    // start these browsers
+    // available browser launchers: https://www.npmjs.com/search?q=keywords:karma-launcher
+    browsers: ['ChromeHeadless'],
+
+
+    // Continuous Integration mode
+    // if true, Karma captures browsers, runs the tests and exits
+    singleRun: false,
+
+    // Concurrency level
+    // how many browser instances should be started simultaneously
+    concurrency: Infinity
+  })
+}