[QGIS-Developer] Python plugin Processing tests using QGIS Docker

[Sergi Maspons - BGEO]

Hi all,

I'm trying to build some CI tests on GitHub (with pytest) using the 
official qgis/qgis Docker image. Everything works fine except for the 
parts of my plugin that use Processing algorithms. I'd like to run full 
workflow tests, but the processing plugin doesn't seem to be available 
in the container.

When I try to load it with qgis.utils.loadPlugin('processing') I get 
this error:

Python error(2): Traceback (most recent call last):
   File "/usr/share/qgis/python/qgis/utils.py", line 447, in loadPlugin
     __import__(packageName)
   File "/usr/share/qgis/python/qgis/utils.py", line 1100, in _import
     mod = _builtin_import(name, globals, locals, fromlist, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'processing'

Couldn't load plugin 'processing'(1): Couldn't load plugin 'processing'

I can't find much documentation on how to build CI tests for a QGIS 
plugin, so I've been trying to make it work, but I don't know if I'm 
doing it rightly...

I've tried installing extra packages (qgis-plugin-grass, grass, saga) in 
the Dockerfile, but it didn't help.

Here's my *Dockerfile*:

ARG QGIS_TEST_VERSION=latest FROM  qgis/qgis:${QGIS_TEST_VERSION} RUN 
apt-get update \     && apt-get install -y python3-pip qgis-plugin-grass 
grass saga \     && rm -rf /var/lib/apt/lists/* COPY 
./test/requirements.txt /tmp/ RUN pip3 install --upgrade pip || true RUN 
pip3 install -r /tmp/requirements.txt || pip3 install -r 
/tmp/requirements.txt --break-system-packages ENV LANG=C.UTF-8 WORKDIR /

This is my *run-docker-tests.sh*:

#!/usr/bin/env bash set -e pushd /usr/src/ibergis_qgis_plugin xvfb-run 
pytest popd

And the relevant part of *GitHub Actions (test.yml)*:

   # Run unit tests   tests-qgis:     runs-on: ubuntu-24.04     
strategy:       fail-fast: false       matrix:         qgis_version: 
[latest, ltr, stable]     env:       QGIS_TEST_VERSION: ${{ 
matrix.qgis_version }}     steps:       - name: Checkout         uses: 
actions/checkout at v4         with:           submodules: recursive       
- name: Test         run: |           chmod +x 
.docker/run-docker-tests.sh           docker compose -f 
.docker/docker-compose.yml run qgis 
/usr/src/ibergis_qgis_plugin/.docker/run-docker-tests.sh

I haven't found much documentation on running QGIS plugin tests in CI 
environments, so I might be missing something obvious.
If anyone has experience running tests that use Processing algorithms 
inside Docker, I'd really appreciate some guidance.

Thanks in advance!

-- 
*Sergi Maspons "Maspi"*
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