NoSuchWindowError：GeckoDriver Firefox和Digrator（Selenium）放弃了浏览上下文

Question

我正在尝试使用量角器运行一个简单的测试脚本。

环境：

Node Version: v9.8.0
Protractor Version: 5.4.1
Angular Version: 1.x
Browser(s): Mozilla Firefox 60.1.0
Operating System and Version: HELiOS release 6.10

这是我的量角器配置文件。

exports.config = {
  specs: ['todo-spec.js'],
  capabilities: {
    browserName: 'firefox',
    marionette : true
  }
};

这是我的测试脚本（todo-spec.js）

describe('application homepage', function() {
  it('should open homepage', function() {
    console.log("Opening localhost app");
    browser.get('http://localhost:8080/app/');
    browser.sleep(20000); // just to check if application loaded or not
  });
});

这是我的node_modules/量角器/node_modules/webdriver-Manager/selenium/目录如下所示：

当我使用/path/to/gradutor conf.js运行测试时，出现了下面提到的错误。

[16:51:03] I/launcher - Running 1 instances of WebDriver
[16:51:03] I/local - Starting selenium standalone server...
[16:51:04] I/local - Selenium standalone server started at http://<ip-address>:45089/wd/hub
Started
Opening localhost
F

Failures:
1) application homepage should open homepage
  Message:
    Failed: Browsing context has been discarded
    Build info: version: '3.14.0', revision: 'aacccce0', time: '2018-08-02T20:13:22.693Z'
    System info: host: 'HOSTNAME', ip: 'ip_address', os.name: 'Linux', os.arch: 'i386', os.version: '2.6.32-754.3.5.el6.x86_64', java.version: '1.8.0_181'
    Driver info: driver.version: unknown
  Stack:
    NoSuchWindowError: Browsing context has been discarded
    Build info: version: '3.14.0', revision: 'aacccce0', time: '2018-08-02T20:13:22.693Z'
    System info: host: 'HOSTNAME', ip: 'ip_address', os.name: 'Linux', os.arch: 'i386', os.version: '2.6.32-754.3.5.el6.x86_64', java.version: '1.8.0_181'
    Driver info: driver.version: unknown
        at Object.checkLegacyResponse (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/error.js:546:15)
        at parseHttpResponse (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/http.js:509:13)
        at doSend.then.response (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/http.js:441:30)
        at <anonymous>
        at process._tickCallback (internal/process/next_tick.js:118:7)
    From: Task: Protractor.get(http://localhost:8080/app/) - reset url
        at thenableWebDriverProxy.schedule (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/webdriver.js:807:17)
        at ProtractorBrowser.executeScriptWithDescription (/export/home/test/protractor_test_2/node_modules/protractor/built/browser.js:404:28)
        at driver.controlFlow.execute.then.then.then (/export/home/test/protractor_test_2/node_modules/protractor/built/browser.js:679:25)
        at ManagedPromise.invokeCallback_ (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/promise.js:1376:14)
        at TaskQueue.execute_ (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/promise.js:3084:14)
        at TaskQueue.executeNext_ (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/promise.js:3067:27)
        at asyncRun (/export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/promise.js:2927:27)
        at /export/home/test/protractor_test_2/node_modules/selenium-webdriver/lib/promise.js:668:7
        at <anonymous>
        at process._tickCallback (internal/process/next_tick.js:118:7)
    From: Task: Run it("should open homepage") in control flow
        at UserContext.<anonymous> (/export/home/test/protractor_test_2/node_modules/jasminewd2/index.js:94:19)
    From asynchronous test:
    Error
        at Suite.<anonymous> (/export/home/test/protractor_test_2/todo-spec.js:2:3)
        at Object.<anonymous> (/export/home/test/protractor_test_2/todo-spec.js:1:63)
        at Module._compile (module.js:649:30)
        at Object.Module._extensions..js (module.js:660:10)
        at Module.load (module.js:561:32)
        at tryModuleLoad (module.js:501:12)

1 spec, 1 failure
Finished in 0.159 seconds

[16:51:06] I/local - Shutting down selenium standalone server.
[16:51:06] I/launcher - 0 instance(s) of WebDriver still running
[16:51:06] I/launcher - firefox #01 failed 1 test(s)
[16:51:06] I/launcher - overall: 1 failed spec(s)
[16:51:06] E/launcher - Process exited with error code 1

任何帮助都将不胜感激。

Answer 1

能够使用以下配置修复此问题。

- Protractor: v5.4.1 
- Selenium JAR driver: selenium-server-standalone-3.141.59.jar 
- geckodriver:geckodriver-v0.20.0-linux64

我们还需要在量角器conf文件中给出geckodrvier的路径。

geckoDriver: 'node_modules/protractor/node_modules/webdriver-manager/selenium/geckodriver-v0.20.0'

默认情况下，webdriver manager将下载geckodriver的最新版本，即0.24.0。但是需要的geckdriver是v0.20.0，所以我手动下载了它，并将其放在node\u modules/gradutor/node\u modules/webdriver manager/selenium/directory中。

希望这对面临类似问题的人有所帮助。

Answer 2

此错误消息...

Failed: Browsing context has been discarded

...暗示壁虎司机和木偶之间的通讯中断了。

关于GeckoDriver二进制版本的更多信息将为我们提供一些关于发生了什么错误的线索。但是，由于以下多种因素，可能会出现此问题：

• 如果您使用了driver.navigate（）. back（）；当Selenium的焦点在内时，导航请求会删除当前浏览上下文。

此问题的根本原因似乎是MemoryUsage。根据间歇性awsy\test_memory_usage.pyTestMemoryUsage.test_open_tabs|NoSuchWindowException：浏览上下文已被丢弃，这是间歇性的。此问题曾被标记为已解决，然后再次重新打开。

正如@Madhan在使用AngularJS应用程序和量角器时提到的，量角器始终包括：

waitForAngularEnabled(true);

最后，根据使用GeckoDriver时的最佳实践，Selenium和Firefox浏览器遵循以下兼容性图表：