Fatal Python error: Aborted

[Captain Haddock]

For my pipeline I have a single test file (test_xxxx.py) that contains many cases. Using the same command as I have configured in my bitbucket-pipelines.yml, I am able to run the tests on my local Ubuntu machine (22.04) yet when run on a BitBucket pipeline VM I see the following:

============================= test session starts ==============================

platform linux -- Python 3.7.16, pytest-7.2.1, pluggy-1.0.0 -- /usr/local/bin/python

cachedir: .pytest_cache

PyQt5 5.15.8 -- Qt runtime 5.15.2 -- Qt compiled 5.15.2

rootdir: /opt/atlassian/pipelines/agent/build, configfile: pytest.ini

plugins: qt-4.2.0, mock-3.10.0

collecting ... collected 9 items

Fatal Python error: Aborted

Current thread 0x00007f7192ad3740 (most recent call first):

  File "/usr/local/lib/python3.7/site-packages/pytestqt/plugin.py", line 66 in qapp

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 908 in call_fixture_func

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 1129 in pytest_fixture_setup

  File "/usr/local/lib/python3.7/site-packages/pluggy/_callers.py", line 39 in _multicall

  File "/usr/local/lib/python3.7/site-packages/pluggy/_manager.py", line 80 in _hookexec

  File "/usr/local/lib/python3.7/site-packages/pluggy/_hooks.py", line 265 in __call__

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 1075 in execute

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 677 in _compute_fixture_value

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 591 in _get_active_fixturedef

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 569 in getfixturevalue

  File "/usr/local/lib/python3.7/site-packages/_pytest/fixtures.py", line 550 in _fillfixtures

  File "/usr/local/lib/python3.7/site-packages/_pytest/python.py", line 1792 in setup

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 492 in setup

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 155 in pytest_runtest_setup

  File "/usr/local/lib/python3.7/site-packages/pluggy/_callers.py", line 39 in _multicall

  File "/usr/local/lib/python3.7/site-packages/pluggy/_manager.py", line 80 in _hookexec

  File "/usr/local/lib/python3.7/site-packages/pluggy/_hooks.py", line 265 in __call__

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 260 in <lambda>

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 339 in from_call

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 260 in call_runtest_hook

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 220 in call_and_report

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 125 in runtestprotocol

  File "/usr/local/lib/python3.7/site-packages/_pytest/runner.py", line 112 in pytest_runtest_protocol

  File "/usr/local/lib/python3.7/site-packages/pluggy/_callers.py", line 39 in _multicall

  File "/usr/local/lib/python3.7/site-packages/pluggy/_manager.py", line 80 in _hookexec

  File "/usr/local/lib/python3.7/site-packages/pluggy/_hooks.py", line 265 in __call__

  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 349 in pytest_runtestloop

  File "/usr/local/lib/python3.7/site-packages/pluggy/_callers.py", line 39 in _multicall

  File "/usr/local/lib/python3.7/site-packages/pluggy/_manager.py", line 80 in _hookexec

  File "/usr/local/lib/python3.7/site-packages/pluggy/_hooks.py", line 265 in __call__

  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 324 in _main

  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 270 in wrap_session

  File "/usr/local/lib/python3.7/site-packages/_pytest/main.py", line 317 in pytest_cmdline_main

  File "/usr/local/lib/python3.7/site-packages/pluggy/_callers.py", line 39 in _multicall

  File "/usr/local/lib/python3.7/site-packages/pluggy/_manager.py", line 80 in _hookexec

  File "/usr/local/lib/python3.7/site-packages/pluggy/_hooks.py", line 265 in __call__

  File "/usr/local/lib/python3.7/site-packages/_pytest/config/__init__.py", line 168 in main

  File "/usr/local/lib/python3.7/site-packages/_pytest/config/__init__.py", line 190 in console_main

  File "/usr/local/lib/python3.7/site-packages/pytest/__main__.py", line 5 in <module>

  File "/usr/local/lib/python3.7/runpy.py", line 85 in _run_code

  File "/usr/local/lib/python3.7/runpy.py", line 193 in _run_module_as_main

2023-02-08T01:37:52.423888867Z stdout P tests/test_qfprobe.py::test_successStates 

I assume this means there is something different about the BitBucket pipeline VM environment. Can someone suggest what might be different that could cause this problem?

I have specifically checked I am matching the versions (as seen at the start of the above trace).

From a web search I came across the following which is similar but on older versions, but I'm unsure how to apply within my BitBucket env. https://stackoverflow.com/questions/64959516/why-a-fatal-python-error-when-testing-using-pytest-qt

Any thoughts welcome .. thank you

[Captain Haddock · Accepted solution]

RESOLVED: The issue was due to the lack of a display in the BitBucket CI pipeline. I solved by using xvfb thus:

script:
- apt-get update
- apt-get install software-properties-common -y
- add-apt-repository ppa:deadsnakes/ppa
- apt install python3.7 -y
- apt install python3-pip -y
- if [ -f requirements.txt ]; then pip3 install -r requirements.txt; fi
- apt-get install xvfb -y
- apt-get install x11-xkb-utils xfonts-100dpi xfonts-75dpi xfonts-scalable xfonts-cyrillic x11-apps -y
- export DISPLAY=:0;/sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_0.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :0 -screen 0 1920x1200x24 -ac +extension GLX +render -noreset
- apt-get install python3-pyqt5 -y
- cd myproj;python3 -m pytest -v tests/*.py;cd ..

[Captain Haddock]

This maybe a doh! moment.

This test that is failing is a UI test of a PyQt5-based UI desktop application. In the BitBucket pipeline there is no display. So what I'm looking for is an example PyQt5 project with pytest-qt UI tests and what the associated bitbucket-pipelines.yml might look like to run the tests.

I have tried tinkering with xvfb with no success yet, hence reaching out to the community for those that have had success and might offer guidance.