python runtime_error ai_generated true

AssertionError: assert False + True == True (pytest assertion rewriting failed)

ID: python/pytest-assertion-rewriting-failure

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80%Fix Rate
80%Confidence
0Evidence
2024-10-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.9 active — — —
3.10 active — — —
3.11 active — — —

Root Cause

Pytest's assertion rewriting mechanism fails to properly rewrite the assertion due to complex expressions or use of 'is' operator with non-boolean values.

generic

中文

由于复杂表达式或对非布尔值使用 'is' 运算符，pytest 的断言重写机制未能正确重写断言。

Workarounds

  1. 90% success Simplify the assertion into multiple steps for better rewriting. 
    result = False + True; assert result == True
  2. 85% success Use explicit comparison with '==' instead of 'is' for value equality. 
    assert (False + True) == True  # instead of 'is True'

Dead Ends

Common approaches that don't work:

  1. Adding more assertions to debug the expression 70% fail

    The rewriting issue persists for similar complex expressions.

  2. Disabling assertion rewriting globally with -O flag 60% fail

    This removes all assertion checks, which is not desirable for testing.