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我想用无头浏览器引擎做一些 UI 测试。由于我们的 Linux 中没有图形单元，因此我使用 docker for chrome

我设置了一个测试：

const chai = require('chai');
const expect = chai.expect;
const chaiAsPromised = require("chai-as-promised");
chai.use(chaiAsPromised);
const webdriverio = require('webdriverio');
const options = { desiredCapabilities: { browserName: 'chrome' } };

const browser = webdriverio
.remote({ host: 'localhost', port: 4444 })
.init({ browserName: 'chrome', version: '45' });

describe('webdriver.io tests', function() {
  it('is a third test', function() {
    browser.url('foo');
    expect(Promise.resolve(browser.getTitle()))
.to.eventually.equal('foo');
});

测试由：

BABEL_ENV=dev npm run mocha-test --recursive=tests/mocha --compilers js:babel-register --require babel-polyfill

但我得到的只是：

Error: A session id is required for this command but wasn't found in the response payload.

谁能帮我？

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