Fix: Correct virtual display use on Linux.

bjones1 · bjones1 · commit fa2f02a60f48 · 2021-10-17T01:01:31.000+01:00
diff --git a/runestone/conftest.py b/runestone/conftest.py
@@ -190,7 +190,7 @@ def setUpModule(self):
         # Testing time in dominated by browser startup/shutdown. So, simply run all tests in a module in a single browser instance to speed things up. See ``RunestoneTestCase.setUp`` for additional code to (mostly) clear the browser between tests.
         #
         # `PyVirtualDisplay <http://pyvirtualdisplay.readthedocs.io/en/latest/>`_ only runs on X-windows, meaning Linux. Mac seems to have `some support <https://support.apple.com/en-us/HT201341>`_. Windows is out of the question.
-        if IS_LINUX:
+        if IS_LINUX and not os.environ.get("DISPLAY"):
             self.display = Display(visible=0, size=(1280, 1024))
             self.display.start()
         else:

Original file line number	Diff line number	Diff line change
`@@ -190,7 +190,7 @@ def setUpModule(self):`
`190`	`190`	# Testing time in dominated by browser startup/shutdown. So, simply run all tests in a module in a single browser instance to speed things up. See ``RunestoneTestCase.setUp`` for additional code to (mostly) clear the browser between tests.
`191`	`191`	`#`
`192`	`192`	# `PyVirtualDisplay <http://pyvirtualdisplay.readthedocs.io/en/latest/>`_ only runs on X-windows, meaning Linux. Mac seems to have `some support <https://support.apple.com/en-us/HT201341>`_. Windows is out of the question.
`193`		`- if IS_LINUX:`
	`193`	`+ if IS_LINUX and not os.environ.get("DISPLAY"):`
`194`	`194`	`self.display = Display(visible=0, size=(1280, 1024))`
`195`	`195`	`self.display.start()`
`196`	`196`	`else:`