I have the problem with PyVirtualDisplay==0.2.5 package for running tests with usage of virtual displays (headless mode)

问题

My tests are working and running as expected with PyVirtualDisplay==0.2.1, but I have a problem with the latest version of this package (for example, PyVirtualDisplay==0.2.5).

My code snippet:

...
    def _set_up(self):

        # Creation of instance of the browser.
        self.display = Display(visible=0, size=(config.WIDTH, config.HEIGHT))
        self.display.start()
        desired = self.get_desired_capabilities(config.BROWSER)
        self.driver = webdriver.Remote(command_executor=config.ACTIVE_NODE,
                                       desired_capabilities=desired)
        # Maximize window size.
        self.driver.set_window_size(config.WIDTH, config.HEIGHT)
...

Error message:

Error Traceback (most recent call last): File "/usr/local/Cellar/python/3.7.6/Frameworks/Python.framework/Versions/3.7/lib/python3.7/unittest/case.py", line 59, in testPartExecutor yield File "/usr/local/Cellar/python/3.7.6/Frameworks/Python.framework/Versions/3.7/lib/python3.7/unittest/case.py", line 624, in run self.setUp() File "/Users/ratmirasanov/Documents/testing/welcome_widget/test_welcome_widget.py", line 24, in setUp self._set_up() File "/Users/ratmirasanov/Documents/testing/utilities.py", line 41, in _set_up self.display.start() File "/Users/ratmirasanov/Documents/testing/venv/lib/python3.7/site-packages/pyvirtualdisplay/abstractdisplay.py", line 171, in start raise XStartTimeoutError(msg % d) pyvirtualdisplay.abstractdisplay.XStartTimeoutError: Failed to start X on display ":1001" (xdpyinfo check failed).

I did not find any working solution to fix this problem. Any help will be appreciated. Thanks.

UPD: The PyVirtualDisplay==0.2.5 package is working as expected on Ubuntu 18.04.3 LTS.

Where is located the xdpyindo program: /usr/bin/xdpyinfo.

The problem is on my Mac (macOS Catalina 10.15.2) with XQuartz (https://www.xquartz.org/index.html) installed (xdpyindo program is located in /opt/X11/bin/xdpyinfo folder).

回答1:

My tests are working and running as expected with PyVirtualDisplay==0.2.1

Your display is taking longer than 10 secs to start. This constraint didn't exist in old versions of PyVirtualDisplay.

Explanation:

Starting with version 0.2.2, PyVirtualDisplay relies on the xdpyinfo program to determine if an X server is running with a given timeout. It only tries to start the display for 10 seconds and then raises a XStartTimeoutError.

https://github.com/ponty/PyVirtualDisplay/commit/3b11cf1e1381921c047ba18f4c5d929847f23b84