Since fc91cbd8dac3db4dd8965b7ef1662b63bad047f6, _pytest_ fails on GitLab CI. Locally, everything works fine for me. [This is the first job](https://code.briarproject.org/nicoalt/briar-gtk/-/jobs/3893) failing for this commit: ``` $ tools/tests/test-pytest.sh ============================= test session starts ============================== platform linux -- Python 3.7.3, pytest-5.2.0, py-1.8.0, pluggy-0.13.0 rootdir: /builds/nicoalt/briar-gtk, inifile: pytest.ini plugins: cov-2.7.1, mock-1.11.0, requests-mock-1.7.0 collected 20 items tests/briar/api/test_constants.py .... [ 20%] tests/briar/api/models/test_contacts.py . [ 25%] tests/briar/api/models/test_private_chat.py .. [ 35%] tests/briar/gtk/test_application.py .....tools/tests/test-pytest.sh: line 6: 4406 Trace/breakpoint trap (core dumped) PYTHONPATH=src pytest --cov=src tests/ ERROR: Job failed: exit code 1 ``` Until this is fixed, I allowed the pipeline to fail with d519ebc7aa5e0d3ed76cba2a424c4e64acf4397a.