karma.conf.js

var webpackConfig = require('./webpack.config.js');

module.exports = function (config) {
  const configuration = {
    // Find all files that match this glob
    files: ['**/*.spec.ts'],
    // Before running any tests, run them through webpack
    preprocessors: {
      "**/*.spec.ts": ['webpack']
    },
    // Use the following webpack configuration (pulled from webpack.config.js)
    // webpack.entry will be set to the file currently being preprocessed
    webpack: {
      mode: webpackConfig.mode,
      devtool: webpackConfig.devtool,
      resolve: webpackConfig.resolve,
      module: webpackConfig.module
    },
    // Allows karma to read ts files
    mime: {
      "text/x-typescript": ['ts', 'tsx']
    },

    browsers: ['Chrome'],
    reporters: ['progress', 'kjhtml'],
    coverageIstanbulReporter: {
      reports: ['html', 'lcovonly'],
      fixWebpackSourcePaths: true
    },
    client: {
      clearContext: false // leave Jasmine Spec Runner output visible in browser
    },

    basePath: '',
    frameworks: ['jasmine'],
    port: 9876,
    colors: true,
    logLevel: config.LOG_INFO,
    autoWatch: true,
    singleRun: false,
    concurrency: Infinity
  };

  if (process.env.TRAVIS) {
    // Travis CI Chrome needs to run without sandbox
    configuration.customLaunchers = {
      ChromeTravis: {
        base: 'Chrome',
        flags: ['--no-sandbox']
      }
    };
    configuration.browsers = ['ChromeTravis'];
  }

  config.set(configuration);
};