vue-cli/packages/@vue/cli-plugin-e2e-nightwatch/nightwatch.config.js

// http://nightwatchjs.org/gettingstarted#settings-file

const path = require('path')
const deepmerge = require('deepmerge')
const chromedriver = require('chromedriver')

// user may have not installed geckodriver
let geckodriver = {}
try {
  geckodriver = require('geckodriver')
} catch (e) {}

const userOptions = JSON.parse(process.env.VUE_NIGHTWATCH_USER_OPTIONS || '{}')
const useSelenium = process.env.VUE_NIGHTWATCH_USE_SELENIUM === '1'
const startHeadless = process.env.VUE_NIGHTWATCH_HEADLESS === '1'
const concurrentMode = process.env.VUE_NIGHTWATCH_CONCURRENT === '1'
const chromeArgs = []
const geckoArgs = []

if (startHeadless) {
  chromeArgs.push('headless')
  geckoArgs.push('--headless')
}

const defaultSettings = {
  src_folders: ['tests/e2e/specs'],
  output_folder: 'tests/e2e/reports',
  page_objects_path: 'tests/e2e/page-objects',
  custom_assertions_path: 'tests/e2e/custom-assertions',
  custom_commands_path: 'tests/e2e/custom-commands',
  test_workers: concurrentMode,
  test_settings: {
    default: {
      detailed_output: !concurrentMode,
      launch_url: '${VUE_DEV_SERVER_URL}'
    },

    chrome: {
      desiredCapabilities: {
        browserName: 'chrome',
        chromeOptions: {
          w3c: false,
          args: chromeArgs
        }
      }
    },

    firefox: {
      desiredCapabilities: {
        browserName: 'firefox',
        alwaysMatch: {
          acceptInsecureCerts: true,
          'moz:firefoxOptions': {
            args: geckoArgs
          }
        }
      },
      webdriver: useSelenium ? {} : {
        server_path: geckodriver.path,
        port: 4444
      }
    }
  }
}

const baseSettings = deepmerge(defaultSettings, webdriverServerSettings())

module.exports = deepmerge(baseSettings, adaptUserSettings(userOptions))

function adaptUserSettings (settings) {
  // The path to nightwatch external globals file needs to be made absolute
  // if it is supplied in an additional config file, due to merging of config files
  if (settings.globals_path) {
    settings.globals_path = path.resolve(settings.globals_path)
  }

  return settings
}

function webdriverServerSettings () {
  if (useSelenium) {
    return {
      selenium: {
        start_process: true,
        host: '127.0.0.1',
        port: 4444,
        server_path: require('selenium-server').path,
        cli_args: {
          'webdriver.chrome.driver': chromedriver.path,
          'webdriver.gecko.driver': geckodriver.path
        }
      }
    }
  }

  return {
    webdriver: {
      start_process: true,
      port: 9515,
      server_path: chromedriver.path
    }
  }
}