karma.conf.js

// Karma configuration
// Generated on Sat Dec 23 2017 21:07:51 GMT-0700 (MST)
process.env.CHROME_BIN = require("puppeteer").executablePath();

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://npmjs.org/browse/keyword/karma-adapter
    frameworks: ["jasmine"],

    // list of files / patterns to load in the browser
    files: ["src/*.test.js"],

    // list of files / patterns to exclude
    exclude: [],

    // preprocess matching files before serving them to the browser
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
    preprocessors: {
      "src/*.test.js": ["webpack", "sourcemap"],
    },

    webpack: {
      module: {
        rules: [
          {
            test: /\.js$/,
            exclude: /node_modules/,
            loader: "babel-loader",
            options: {
              plugins: ["istanbul"],
            },
          },
        ],
      },
      devtool: "inline-source-map",
    },

    // test results reporter to use
    // possible values: 'dots', 'progress'
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter
    reporters: ["progress", "coverage"],

    coverageReporter: {
      dir: "reports/coverage",
      reporters: [
        {
          type: "json",
          subdir: "chrome",
          dir: "coverage/",
          file: "coverage.txt",
        },
        {
          type: "text",
        },
      ],
    },

    // 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: true,

    // start these browsers
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
    browsers: ["ChromeHeadlessNoSandbox"],

    customLaunchers: {
      ChromeHeadlessNoSandbox: {
        base: 'ChromeHeadless',
        flags: ['--no-sandbox'],
      },
    },

    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: false,

    // Concurrency level
    // how many browser should be started simultaneous
    concurrency: Infinity,
  });
};