丢失的UI共享上下文错误-在无头Chrome中运行量角器测试 [英] Lost UI Shared Context Error - Running protractor tests in headless chrome

问题描述

我正在尝试使用chrome在本地运行量角器测试，但是在无头模式下，我看到了解决方案

如上所述，您正在Linux Jenkins节点上使用 Chrome无头模式，您需要考虑以下因素:

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-disable-gpu

Google团队将 Headless Chrome 作为 GA(通用)首次发布时，文章 Getting Started with Headless Chrome 提到:

--disable-gpu \                # Temporarily needed if running on Windows.

注释添加为:

现在，如果您在Windows上运行，则还希望包含--disable-gpu标志.

根据讨论> Headless: make --disable-gpu flag unnecessary > 很明显:

在 Linux 或 Mac OSX 上不再需要--disable-gpu标志.错误 SwiftShader fails an assert on Windows in headless mode 是固定的.

您可以在讨论视口.

为了利用最大可能的视口，您必须通过以下参数以 maximized 模式初始化 Chrome浏览器: >

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角度

从角度角度来看，您可以使用适当的expected_conditions来避免超时 .您可以在 WebDriverWait无法按预期运行

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-无头

最后，我不确定您在中的含义是什么......当我尝试使用无头选项且未设置chrome选项时，我的测试无法运行... .也许只能通过 chromeOptions 调用参数'-headless'，而不能使用其他选择.

I am attempting to run protractor tests locally using chrome but in headless mode, I have seen the docs and added the appropriate options to my config file:

capabilities: {
    browserName: 'chrome',
    shardTestFiles: true,
    chromeOptions: {
      args: [ '--headless', '--disable-gpu', '--window-size=800,600' ]
    }
  }

Upon running, I encounter the following error:

[1009/122000.081:ERROR:gpu_process_transport_factory.cc(1007)] Lost UI shared context.

I tried removing the --disable-gpu flag as I read this may not be needed in future version of Chrome. I currently have latest Chrome installed (69.0.3497.100) and am using windows 7.

What do I need to do in order to get the tests running in headless mode? My intention is to check I can run in headless mode fine locally and then I want to get it running also in Chrome headless mode on a linux Jenkins node, where we are currently using XVFB but its proving to be too flaky with timeouts in tests for example.

Thanks

EDIT

With regards to others marking this as a duplicate - I should have said that my tests fail to run when I attempt to use the headless option, without the chrome options set, Chrome launches as expected and the test run and pass successfully.

My tests fail with no such element found type errors and if I view the screenshots taken on the failures, I just see a white square inside a black background (probably as per the --window-size option I was setting)

解决方案

As you mentioned you are using Chrome headless mode on a linux Jenkins node you need consider a few factors as follows:

---

--disable-gpu

When Headless Chrome was first released as GA (General Availability) by Google Team the article Getting Started with Headless Chrome mentioned that :

--disable-gpu \                # Temporarily needed if running on Windows.

A note was added as :

Right now, you'll also want to include the --disable-gpu flag if you're running on Windows.

As per the discussion Headless: make --disable-gpu flag unnecessary it was clear that :

The --disable-gpu flag is no longer necessary on Linux or Mac OSX. It will also become unnecessary on Windows as soon as the bug SwiftShader fails an assert on Windows in headless mode is fixed.

You can find a detailed discussion on What happened under the hood in the discussion ChromeDriver showing Lost UI Shared Context

So as a first step you need to remove the argument: '--disable-gpu'

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flaky tests

You seem to be executing your tests with the argument --window-size=800,600 which implies a reduced Viewport.

In order to utilize the maximum possible Viewport you must initialize the Chrome Browser in maximized mode through the argument: 'start-maximized'

---

angular

From Angular perspective, you can avoid timeouts by using the proper expected_conditions. You can find a detailed discussion about different expected_conditions in WebDriverWait not working as expected

---

--headless

Finally, I am not sure what exactly you meant as in ...my tests fail to run when I attempt to use the headless option, without the chrome options set.... Perhaps the argument '--headless' can be invoked only through chromeOptions and no other alternative.

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