Temporary disable xdist on GHA

Related: #3568

.config/dictionary.txt

@@ -13,6 +13,7 @@ EPIPE # linux
 Fimport
 Jython
 MYTAG
+PYTEST_ADDOPS
 PYTHONBREAKPOINT
 PYTHONIOENCODING
 PYTHONPYCACHEPREFIX

.github/workflows/tox.yml

@@ -62,6 +62,9 @@ jobs:
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
       PYTEST_REQPASS: 804
+      # Temporary disable parallelism under GHA until we sort concurrency issues
+      # related to collection installations.
+      PYTEST_ADDOPS: "-n1"
     steps:
       - name: Activate WSL1
         if: "contains(matrix.shell, 'wsl')"

pyproject.toml

@@ -174,7 +174,7 @@ include = ["src"]
 [tool.pytest.ini_options]
 # do not add options here as this will likely break either console runs or IDE
 # integration like vscode or pycharm
-addopts = "-p no:pytest_cov"
+addopts = "-p no:pytest_cov -n auto -ra --showlocals --doctest-modules --durations=10"
 # https://code.visualstudio.com/docs/python/testing
 # coverage is re-enabled in `tox.ini`. That approach is safer than
 # `--no-cov` which prevents activation from tox.ini and which also fails

tox.ini

@@ -29,13 +29,7 @@ commands_pre =
 commands =
   # safety measure to assure we do not accidentally run tests with broken dependencies
   {envpython} -m pip check
-  coverage run -m pytest {posargs:\
-    -n auto \
-    -ra \
-    --showlocals \
-    --doctest-modules \
-    --durations=10 \
-    }
+  coverage run -m pytest {posargs:}
   sh -c "coverage combine -a -q --data-file=.coverage .tox/.coverage.*"
 
 passenv =