Issues

• Pytests now supports subtests in core, but these seem thread-unsafe

  Quansight-Labs/pytest-run-parallel#195 · Filter by author seberg opened on Aug 31, 2026

• Threads marked with @pytest.mark.thread_unsafe are run multiple times if --iterations is set

  Quansight-Labs/pytest-run-parallel#192 · Filter by author itamarst opened on Jul 23, 2026
  2

• Add a condition keyword argument to thread_unsafe marker

  Quansight-Labs/pytest-run-parallel#190 · Filter by author ngoldbaum opened on Jun 30, 2026

• Add per thread/test setup hook?

  Quansight-Labs/pytest-run-parallel#189 · Filter by author seberg opened on Jun 29, 2026
  2

  

• Automatically mark tests that use importlib.reload as thread-unsafe

  Quansight-Labs/pytest-run-parallel#171 · Filter by author ngoldbaum opened on Mar 6, 2026

• Automatically mark tests using pyplot as thread-unsafe

  Quansight-Labs/pytest-run-parallel#170 · Filter by author ngoldbaum opened on Feb 26, 2026

• Race condition with warnings issued once directly and once inside pytest.warns

  Quansight-Labs/pytest-run-parallel#169 · Filter by author lesteve opened on Jan 27, 2026
  2

  

• thread_index, tmpdir, tmp_path, iteration_index fixtures in other fixtures

  Quansight-Labs/pytest-run-parallel#163 · Filter by author crusaderky opened on Dec 28, 2025
  1

• Speed up AST parsing with an on-disk cache

  Quansight-Labs/pytest-run-parallel#136 · Filter by author ngoldbaum opened on Oct 17, 2025

• tests using recwarn should be automatically marked as unsafe

  Quansight-Labs/pytest-run-parallel#135 · Filter by author ngoldbaum opened on Oct 14, 2025

• request.getfixturevalue results in recursive dependency error

  Quansight-Labs/pytest-run-parallel#133 · Filter by author bwhitt7 opened on Oct 7, 2025
  1

• Keeping a list of bugs found by pytest-run-parallel

  Quansight-Labs/pytest-run-parallel#132 · Filter by author nickodell opened on Oct 3, 2025
  4

• tmp_path_factory / tmpdir_factory failure

  Quansight-Labs/pytest-run-parallel#131 · Filter by author crusaderky opened on Oct 1, 2025

• Tests using benchmark fixture from pytest-benchmark should be marked as unsafe

  Quansight-Labs/pytest-run-parallel#104 · Filter by author ngoldbaum opened on Jul 29, 2025

• Warn against using multiprocessing with fork

  Quansight-Labs/pytest-run-parallel#93 · Filter by author lysnikolaou opened on Jul 10, 2025

• Report tests where source code inspection / AST parsing failed

  Quansight-Labs/pytest-run-parallel#92 · Filter by author lysnikolaou opened on Jul 10, 2025

• Windows test runners have trouble formatting default output

  Quansight-Labs/pytest-run-parallel#77 · Filter by author ngoldbaum opened on Jun 10, 2025
  2

• Provide a facility for thread-safe stdout/stderr redirection

  Quansight-Labs/pytest-run-parallel#29 · Filter by author ngoldbaum opened on Mar 10, 2025
  1

• interaction with inline_snapshot & mocking

  Quansight-Labs/pytest-run-parallel#26 · Filter by author davidhewitt opened on Feb 6, 2025
  6

• --run-parallel doesn't work well with old style @pytest.mark.xfail("expr", ...)

  Quansight-Labs/pytest-run-parallel#16 · Filter by author colesbury opened on Nov 7, 2024
  2

• Don't reuse function-scope fixtures across parallel tests

  Quansight-Labs/pytest-run-parallel#14 · Filter by author colesbury opened on Nov 6, 2024
  15