karma.conf.js

import webpackConfig from "./webpack.config.js";

var reporters = ["dots"];

if (process.env.COVERAGE || process.env.CONTINUOUS_INTEGRATION) {
  console.log("This test run will generate coverage reports");
  reporters.push("coverage");

  if (process.env.CONTINUOUS_INTEGRATION) {
    console.log("Coverage reports will be uploaded to coveralls.io");
    reporters.push("coveralls");
  }
}

export default 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: [{ pattern: "spec/index.js", watch: false }],

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

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

    webpack: {
      devtool: "inline-source-map",
      resolve: webpackConfig.resolve,
      module: {
        loaders: webpackConfig.module.loaders,
        preLoaders: webpackConfig.module.preLoaders,
      },
    },
    webpackMiddleware: {
      noInfo: true,
    },
    client: {
      // log console output in our test console
      captureConsole: true,
    },

    reporters: reporters,
    coverageReporter: {
      dir: ".coverage",
      reporters: [{ type: "html" }, { type: "lcovonly" }],
    },

    // 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: [
      process.env.CONTINUOUS_INTEGRATION ? "ChromeTravisCI" : "Chrome",
    ],
    customLaunchers: {
      ChromeTravisCI: {
        base: "Chrome",
        flags: ["--no-sandbox"],
      },
    },

    // Continuous Integration mode
    // if true, Karma captures browsers, runs the tests and exits
    singleRun: process.env.CONTINUOUS_INTEGRATION,

    // Concurrency level
    // how many browser should be started simultanous
    concurrency: Number.POSITIVE_INFINITY,
    captureTimeout: 60_000,
    browserNoActivityTimeout: 60_000, // 60 seconds
  });
}