python data_error ai_generated true

ValueError: 2 parameters passed to 'test_add' but expected 1

ID: python/pytest-parametrize-arg-count-mismatch

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80%Fix Rate
86%Confidence
0Evidence
2024-11-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.10 active — — —

Root Cause

The @pytest.mark.parametrize decorator provides a number of arguments that does not match the test function's parameter list, causing a ValueError.

generic

中文

@pytest.mark.parametrize 装饰器提供的参数数量与测试函数的参数列表不匹配，导致 ValueError。

Workarounds

  1. 95% success 
    Ensure the number of arguments in the parametrize decorator matches the test function's parameters. For example, if the test expects (a, b), use @pytest.mark.parametrize('a,b', [(1,2)])
  2. 80% success 
    Use a single argument with a tuple or list if the test function accepts one parameter that contains multiple values.

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Adding extra parameters to the test function without updating the parametrize decorator may fix the count but could break other tests.

  2. 70% fail

    Removing arguments from the decorator without adjusting the test function leads to missing required parameters.