talk/scripts/e2e.js

#!/usr/bin/env node

const Nightwatch = require('nightwatch');
const browserstack = require('browserstack-local');

try {
  const bs_local = new browserstack.Local();
  process.mainModule.filename = './node_modules/.bin/nightwatch';

  // Code to start browserstack local before start of test
  console.log('Connecting local');
  Nightwatch.bs_local = bs_local;
  bs_local.start({'key': process.env.BROWSERSTACK_KEY}, function(error) {
    if (error) {
      console.error(error);
      throw error;
    }

    console.log('Connected. Now testing...');
    Nightwatch.cli(function(argv) {
      Nightwatch.CliRunner(argv)
        .setup(null, function(){

          // Code to stop browserstack local after end of parallel test
          bs_local.stop(function(){});
        })
        .runTests(function(){

          // Code to stop browserstack local after end of single test
          bs_local.stop(function(){});
        });
    });
  });
} catch (ex) {
  console.log('There was an error while starting the test runner:\n\n');
  process.stderr.write(`${ex.stack}\n`);
  process.exit(2);
}