NoSuchWindowError：浏览器上下文已被丢弃与GeckoDriver Firefox和量角器（硒）

Question

我试图运行使用量角器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（待办事项，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的经理/硒/目录下的样子：

当我使用/path/to/protractor conf.js运行我的测试，我得到以下提到的错误。

[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，将不胜感激。

Answer 1

此错误消息...

Failed: Browsing context has been discarded

...意味着GeckoDriver和木偶之间的通信被打破。

关于GeckoDriver二进制版本的一些详细信息，就会给我们介绍一下什么是错发生了一些线索。然而这一问题的发生可能由于多种因素如下：

• 按照Hang when navigation request removes the current browsing context如果你已经使用driver.navigate().back();当硒的重点是观察这个错误的<iframe>内。
• 按照Crash during command execution results in "Internal Server Error: Failed to decode response from marionette"这个问题也可能是由于的ctypes检查NULL指针derefs。 你可以找到硒测试用例here。也许，而不是恐慌，这本来是更好地通过清除任何国家和返回geckodriver再次接受新的连接更加妥善地处理这个问题。
• 如果你没有使用二进制的complient版本每Failed to decode response from marionette - Error to open Webdriver using python也可能发生这个问题。

这个用例

这个问题的根源似乎是的MemoryUsage。按照Intermittent awsy\test_memory_usage.py TestMemoryUsage.test_open_tabs | NoSuchWindowException: Browsing context has been discarded在本质上是断断续续的。一度被标记这个问题为已解决然后再重新打开。

作为@Madhan提到与AngularJS应用和量角器工作时总是包括：

waitForAngularEnabled(true);

最后，GeckoDriver，硒和Firefox浏览器工作时，按照最佳做法，按照下面的兼容性图表：

Supported platforms

Answer 2

能够解决这个问题，下面的配置。

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

此外，我们需要给geckodrvier的路径量角器的conf文件。

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

默认情况下的webdriver管理器将下载最新版本geckodriver是0.24.0的。但需要geckdriver是v0.20.0，所以我手动下载了这一点，并把它放在里面node_modules /量角器/ node_modules / webdriver的经理/硒/目录。

希望这有助于面临类似问题的人。