pin pytest-run-parallel

Author: Liam-DeVoe

hypothesis-python/tox.ini

@@ -250,7 +250,9 @@ commands =
 [testenv:threading]
 deps =
     -r../requirements/test.txt
-    pytest-run-parallel>=0.6.0
+    # in pytest-run-parallel==0.7.0, python3.10 + pytest-run-parallel + xdist does
+    # not collect any tests. I don't know why.
+    pytest-run-parallel==0.6.0
 setenv=
     PYTHONWARNDEFAULTENCODING=1
     HYPOTHESIS_PROFILE=threading