# PytestUnknownMarkWarning: Unknown pytest.mark.slow - is this a typo?

- **ID:** `python/pytest-markers-unknown`
- **Domain:** python
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

使用了未注册的pytest标记，导致警告，可能影响测试筛选。

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.8 | active | — | — |

## Workarounds

1. **** (100% success)
   ```
   [pytest]
markers =
    slow: marks tests as slow
   ```
2. **** (95% success)
   ```
   def pytest_configure(config):
    config.addinivalue_line('markers', 'slow: slow tests')
   ```

## Dead Ends

- **** — 可能导致标记不生效，测试筛选失败。 (60% fail)
- **** — 可能移除需要的测试分类。 (70% fail)