# AssertionError: assert {'a': 1, 'b': 2} == {'a': 1, 'b': 3}
  Omitting 1 identical items, use -vv to show
  Differing items:

- **ID:** `python/pytest-assertion-introspection-noqa`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

The assertion diff is truncated by default; developers think the diff is missing when actually -vv would show it. Sometimes the real bug is a type mismatch (1 vs '1').

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 7.x | active | — | — |
| 8.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   pytest -vv tests/test_x.py::test_dict
   ```
2. **** (90% success)
   ```
   # pytest.ini
[pytest]
addopts = -vv --showlocals
   ```

## Dead Ends

- **** — Adds noise; the real fix is enabling verbose diff. (70% fail)
- **** — unittest diff is also truncated by default. (75% fail)
- **** — Only shows the message, not the structured diff. (80% fail)