Use pytest-cov plugin for coverage

This handles the parallel/multithreaded tests better than regular
coverage, which excluded a lot of lines (due to parallelization/
combination of coverage reports before they were done?)

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
         run: python manage.py collectstatic --noinput --settings=config.settings.test
 
       - name: Run tests
-        run:  coverage run -p -m pytest -n auto
+        run:  pytest --cov=primed -n auto
 
       - name: Upload coverage data
         uses: actions/upload-artifact@v4

requirements/test-requirements.in

@@ -4,6 +4,8 @@
 pytest  # https://github.com/pytest-dev/pytest
 # Parallelized tests
 pytest-xdist  # https://github.com/pytest-dev/pytest-xdist
+# Coverage integrated with pytest
+pytest-cov
 # Pytest improvements - progress bar, etc.
 pytest-sugar  # https://github.com/Frozenball/pytest-sugar
 # Mock HTTP responses

requirements/test-requirements.txt

@@ -57,6 +57,8 @@ pytest==8.2.0
     #   -r requirements/test-requirements.in
     #   pytest-django
     #   pytest-sugar
+pytest-cov==5.0.0
+    # via -r requirements/test-requirements.in
 pytest-django==4.8.0
     # via -r requirements/test-requirements.in
 pytest-sugar==1.0.0