karma.conf.js

const realBrowser = String(process.env.BROWSER).match(/^(1|true)$/gi);
const travisLaunchers = {
  chrome_travis: {
    base: 'Chrome',
    flags: ['--no-sandbox']
  }
};

const localBrowsers = realBrowser ? Object.keys(travisLaunchers) : ['Chrome'];

module.exports = (config) => {
  config.set({
    frameworks: ['jasmine', 'karma-typescript'],
    plugins: [
      'karma-jasmine',
      'karma-chrome-launcher',
      'karma-typescript',
      'karma-spec-reporter'
    ],
    karmaTypescriptConfig: {
      tsconfig: './tsconfig.json'
    },
    client: {
      clearContext: false
    },
    files: [{ pattern: 'src/**/*.ts' }, { pattern: 'test/**/*.spec.ts' }],
    preprocessors: {
      'src/**/*.ts': ['karma-typescript'],
      'test/**/*.spec.ts': ['karma-typescript']
    },
    reporters: ['spec', 'karma-typescript'],
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    browsers: localBrowsers,
    singleRun: true
  });
};