zuul.config.js

'use strict';

const browsers = require('socket.io-browsers');

const zuulConfig = module.exports = {
  ui: 'mocha-bdd',

  // test on localhost by default
  local: true,
  coverage: false,
  open: true,

  concurrency: 2, // ngrok only accepts two tunnels by default
  // if browser does not sends output in 120s since last output:
  // stop testing, something is wrong
  browser_output_timeout: 120 * 1000,
  browser_open_timeout: 60 * 4 * 1000,
  // we want to be notified something is wrong asap, so no retry
  browser_retries: 1
};

if (process.env.CI === 'true') {
  zuulConfig.local = false;
  zuulConfig.tunnel = {
    type: 'ngrok',
    bind_tls: true
  };
  zuulConfig.browserify = [
    {
      transform: {
        name: "babelify",
        presets: ["@babel/preset-env"],
        global: true,
        ignore: [/\/node_modules\/(?!debug\/)/]
      }
    }
  ]
}

const isPullRequest = process.env.TRAVIS_PULL_REQUEST && process.env.TRAVIS_PULL_REQUEST !== 'false';
zuulConfig.browsers = isPullRequest ? browsers.pullRequest : browsers.all;