python type_error ai_generated true

TypeError: test_case() missing 1 required positional argument: 'expected'

ID: python/typeerror-test-case-missing-args

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-04-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —
3.10 active — — —

Root Cause

Test function defined with required arguments but called without providing all arguments.

generic

中文

测试函数定义了必需参数但调用时未提供所有参数。

Workarounds

  1. 95% success Provide the missing argument in the test call 
    def test_case(input, expected): ... ; test_case(5, 10)
  2. 98% success Use pytest parametrize to supply arguments 
    @pytest.mark.parametrize('input,expected', [(5,10)]) 
def test_case(input, expected): ...

Dead Ends

Common approaches that don't work:

  1. Adding a default value to expected 50% fail

    Default values may mask missing arguments but still cause logic errors if not intended.

  2. Ignoring the error and rerunning 90% fail

    The test will continue to fail until the argument is provided.