Live server tests from cron

I have some tests that use LiveServerTestCase and selenium. When I run
them from the command line they work fine. But I want to run them from
cron. I know I need to use pyvirtualdisplay, but I can't seem to get
it to work.

I have this in my test:

from pyvirtualdisplay import Display

@classmethod
def setUpClass(cls):
#initialize HIDDEN display
display = Display(visible=0, size=(800, 600))
display.start()

cls.selenium = WebDriver()
super(EventsTableTestLive, cls).setUpClass()

But it fails with:

WebDriverException: Message: 'The browser appears to have exited
before we could connect. The output was: Error: cannot open display:
:1024\n'

Where the display number is different each time. Googling this, I saw
that I needed to add something like this to the script I run from cron
that invokes the tests:

export DISPLAY=:0.0
xhost +

But that seems to have had no effect at all. This question seems to
have been asked a lot, but none of the answers I saw on SO or other
sites worked for me (none of them were using django).

Anyone here run LiveServerTestCase selenium tests from cron?

Thanks!
-larry

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