python runtime_error ai_generated true

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

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-04-15First Seen

Version Compatibility

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

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').

generic

中文

断言差异默认被截断；开发者认为差异缺失，实际上 -vv 会显示它。有时真正的错误是类型不匹配（1 与 '1'）。

Workarounds

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

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Adds noise; the real fix is enabling verbose diff.

  2. 75% fail

    unittest diff is also truncated by default.

  3. 80% fail

    Only shows the message, not the structured diff.