old_contents: const reporter = require('mocha/lib/reporters').min;
  const bridgeTests = require('mocha-selenium-bridge');
  const { Builder } = require('selenium-webdriver');
  
  const bsConfig = {
    project: 'messageformat',
    'browserstack.local': 'true',
    'browserstack.user': process.env.BROWSERSTACK_USER,
    'browserstack.key': process.env.BROWSERSTACK_ACCESS_KEY,
    'browserstack.localIdentifier': process.env.BROWSERSTACK_LOCAL_IDENTIFIER
  };
  
  const PORT = 3000;
  const url = `http://localhost:${PORT}/test/browser/test.html`;
  
  /* eslint-disable camelcase */
  exports.testBrowser = async function (browserName, browser_version) {
    const cap = Object.assign({ browserName, browser_version }, bsConfig);
    const driver = new Builder()
      .usingServer('http://hub-cloud.browserstack.com/wd/hub')
      .withCapabilities(cap)
      .build();
    const code = await bridgeTests(driver, reporter, url, { timeout: 20000 });
    driver.quit();
    if (code > 0) throw new Error(`Failed ${code} tests`);
    if (code < 0) throw new Error(`MSB error ${code}`);
  };
  
new_contents: const reporter = require('mocha/lib/reporters').min;
  const bridgeTests = require('mocha-selenium-bridge');
  const { Builder } = require('selenium-webdriver');
  
  const bsConfig = {
    project: 'messageformat',
    'browserstack.local': 'true',
    'browserstack.user':
      process.env.BROWSERSTACK_USER || process.env.BROWSERSTACK_USERNAME,
    'browserstack.key': process.env.BROWSERSTACK_ACCESS_KEY,
    'browserstack.localIdentifier': process.env.BROWSERSTACK_LOCAL_IDENTIFIER
  };
  
  const PORT = 3000;
  const url = `http://localhost:${PORT}/test/browser/test.html`;
  
  /* eslint-disable camelcase */
  exports.testBrowser = async function (browserName, browser_version) {
    const cap = Object.assign({ browserName, browser_version }, bsConfig);
    const driver = new Builder()
      .usingServer('http://hub-cloud.browserstack.com/wd/hub')
      .withCapabilities(cap)
      .build();
    const code = await bridgeTests(driver, reporter, url, { timeout: 20000 });
    driver.quit();
    if (code > 0) throw new Error(`Failed ${code} tests`);
    if (code < 0) throw new Error(`MSB error ${code}`);
  };
  
subject: Fix env var name for BrowserStack user