SessionNotCreated和驱动程序信息：driver.version：在node.js中运行Selenium测试用例时未知

Question

我收到此错误

(node:4369) UnhandledPromiseRejectionWarning: SessionNotCreatedError: Expected browser binary location, but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided, and no binary flag set on the command line Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: 'ubuntu-xenial', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '4.4.0-157-generic', java.version: '1.8.0_201'


Driver info: driver.version: unknown
remote stacktrace: 
    at Object.checkLegacyResponse (/../node_modules/selenium-webdriver/lib/error.js:585:15)
    at parseHttpResponse (/../node_modules/selenium-webdriver/lib/http.js:551:13)
    at Executor.execute (/../node_modules/selenium-webdriver/lib/http.js:486:26)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:4369) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:4369) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

我正在尝试运行（test / somehello.js）

const {Builder, By, Key, until} = require('selenium-webdriver');

(async function example() {
  let driver = await new Builder().forBrowser('firefox')
  .usingServer('http://localhost:4444/wd/hub')
  .build();
  try {
    await driver.get('http://www.google.com/ncr');
    await driver.findElement(By.name('q')).sendKeys('webdriver', Key.RETURN);
    await driver.wait(until.titleIs('webdriver - Google Search'), 1000);
    console.log('hwllo world');
  } finally {
    await driver.quit();
  }
})();

Chrome和Firefox驱动程序位于'/ usr / bin'中。

我正在使用运行Ubuntu的Vagrant盒。

运行测试代码时，可以显示硒独立服务器（3.141.59.jar）日志

08：50：35.436信息[ActiveSessionFactory.apply]-功能为：{      “ browserName”：“ firefox”    }

任何帮助将不胜感激。