python config_error ai_generated true

PytestUnknownMarkWarning: Unknown pytest.mark.slow - is this a typo? You can register custom marks to avoid this warning

ID: python/pytest-marker-unknown-warning

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2025-07-08First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
7.x active — — —
8.x active — — —

Root Cause

A custom marker is used without being registered in pytest.ini/pyproject.toml; pytest emits a warning, and with `-W error` it becomes a failure.

generic

中文

使用了未在 pytest.ini/pyproject.toml 注册的自定义标记；pytest 发出警告，在 `-W error` 下变为失败。

Workarounds

  1. 98% success 
    # pyproject.toml
[tool.pytest.ini_options]
markers = [
  "slow: marks tests as slow",
  "integration: requires external services",
]

# then
pytest -m slow
  2. 90% success 
    # pyproject.toml
[tool.pytest.ini_options]
addopts = "--strict-markers"
markers = ["slow: slow tests"]

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Changes test semantics (skips instead of conditionally selecting) and loses filtering capability.

  2. 70% fail

    Hides typos in marker names and prevents `--strict-markers` from catching regressions.

  3. 95% fail

    Suppresses all warnings, including real deprecations and correctness issues.