karma.conf.js

// Karma configuration
// Generated on Wed Mar 13 2019 15:27:13 GMT+0800 (GMT+08:00)

if (process.env.CI) {
  process.env.CHROME_BIN = "/usr/bin/google-chrome";
}

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: ["**/__tests__/*.test.tsx"],

    // 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: {
      "**/__tests__/*.test.tsx": ["webpack"],
    },

    webpack: {
      mode: "development",
      module: {
        rules: [
          {
            test: /\.(js|ts|jsx|tsx)$/,
            // /~https://github.com/webpack/webpack/issues/6544#issuecomment-368023618
            exclude: /node_modules/,
            use: "babel-loader",
          },
        ],
      },
      resolve: {
        extensions: [".ts", ".tsx", ".js", ".jsx", ".json"],
        alias: {
          utils$: require("path").resolve(__dirname, "./utils.ts"),
        },
      },
      stats: "errors-only",
    },

    webpackMiddleware: {
      stats: "errors-only",
    },

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

    // 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://npmjs.org/browse/keyword/karma-launcher
    browsers: process.env.CI ? ["ChromeHeadlessNoSandbox"] : ["Chrome"],

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

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

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