explicitly specify config file in pytest 6

Author: tybug

hypothesis-python/tox.ini

@@ -205,7 +205,11 @@ setenv=
     PYTHONWARNDEFAULTENCODING=
 commands=
     pip install pytest==6.2.5 pytest-xdist
-    python -bb -X dev -m pytest tests/pytest tests/cover/test_testdecorators.py
+    # explicitly pass config file to suppress automatic discovery, which would error with a parsing
+    # bug for toml. only on pytest 6, as the only major version to support pyproject.toml and also
+    # use an affected parsing library.
+    # https://github.com/HypothesisWorks/hypothesis/pull/4326#issuecomment-2764314834
+    python -bb -X dev -m pytest -c ../pytest.ini tests/pytest tests/cover/test_testdecorators.py
 
 [testenv:pytest7]
 deps =