Running CI tests with PyQT - continuous-integration

Question

I am setting up a CI Bitbucket pipeline for my team. We are using pytest and pytest-qt to test our software. The tests run locally without any issue, but the build fails using pipeline. Here is the pipeline yml:
image: python:3.9
pipelines:
default:
- parallel:
- step:
name: Test
caches:
- pip
script:
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
- pip install pytest
- pip install pytest-qt
- pytest -v tools/IntegrationTests.py --junitxml=test-reports/report.xml
The file requirements.txt contains several modules including:
PyQt5==5.15.4
PyQt5-Qt5==5.15.2
And here is the output when trying to build:
+ pytest -v tools/IntegrationTests.py --junitxml=test-reports/report.xml
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/_pytest/main.py", line 265, in wrap_session
INTERNALERROR> config._do_configure()
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/_pytest/config/__init__.py", line 982, in _do_configure
INTERNALERROR> self.hook.pytest_configure.call_historic(kwargs=dict(config=self))
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/hooks.py", line 308, in call_historic
INTERNALERROR> res = self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 93, in _hookexec
INTERNALERROR> return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/manager.py", line 84, in <lambda>
INTERNALERROR> self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 208, in _multicall
INTERNALERROR> return outcome.get_result()
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 80, in get_result
INTERNALERROR> raise ex[1].with_traceback(ex[2])
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pluggy/callers.py", line 187, in _multicall
INTERNALERROR> res = hook_impl.function(*args)
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pytestqt/plugin.py", line 203, in pytest_configure
INTERNALERROR> qt_api.set_qt_api(config.getini("qt_api"))
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pytestqt/qt_compat.py", line 104, in set_qt_api
INTERNALERROR> self.QtGui = _import_module("QtGui")
INTERNALERROR> File "/usr/local/lib/python3.9/site-packages/pytestqt/qt_compat.py", line 100, in _import_module
INTERNALERROR> m = __import__(_root_module, globals(), locals(), [module_name], 0)
INTERNALERROR> ImportError: libGL.so.1: cannot open shared object file: No such file or directory
What I get from that is that Qt is not properly installed remotely, thus the tests cannot run.
My question is: can GUI be tested in CI, and if yes, how?
EDIT:
I have broke down to test only the import of PyQt and it boiled down to this test suite:
def test_import_widgets():
from PyQt5 import QtWidgets
def test_import_core():
from PyQt5 import QtCore
def test_import_gui():
from PyQt5 import QtGui
def test_import_qt():
from PyQt5.QtCore import Qt
Which have resulted in the following results:
2 / 4 tests failed
BasicsTests.test_import_guitools
<1s
ImportError: libGL.so.1: cannot open shared object file: No such file or directory
def test_import_gui():
> from PyQt5 import QtGui
E ImportError: libGL.so.1: cannot open shared object file: No such file or directory
tools/BasicsTests.py:50: ImportError
BasicsTests.test_import_widgetstools
<1s
ImportError: libGL.so.1: cannot open shared object file: No such file or directory
def test_import_widgets():
> from PyQt5 import QtWidgets
E ImportError: libGL.so.1: cannot open shared object file: No such file or directory
tools/BasicsTests.py:42: ImportError

Answer 1

You have to install the Qt dependencies:
image: python:3.9
pipelines:
default:
- parallel:
- step:
name: Test
caches:
- pip
script:
- apt-get update && apt-get autoclean
- apt-get install -y '^libxcb.*-dev' libx11-xcb-dev libglu1-mesa-dev libxrender-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
- pip install pytest
- pip install pytest-qt
- pytest -v tools/IntegrationTests.py --junitxml=test-reports/report.xml