python config_error ai_generated true

ValueError: duplicate 'test_id' in parametrize

ID: python/pytest-parametrize-id-duplicate

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-06-01First Seen

Version Compatibility

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

Root Cause

Two or more parametrized cases have the same ID, either explicitly set via ids or generated automatically from identical parameter values.

generic

中文

两个或多个参数化用例具有相同的 ID，要么通过 ids 显式设置，要么从相同的参数值自动生成。

Workarounds

  1. 95% success 
    @pytest.mark.parametrize('x', [1, 1], ids=['first', 'second'])
def test_foo(x): ...
  2. 90% success 
    def idfn(val):
    return f'val-{val}-{uuid.uuid4()}'

@pytest.mark.parametrize('x', [1, 1], ids=idfn)

Dead Ends

Common approaches that don't work:

  1. 70% fail

    If the parameter values are identical, pytest still generates duplicate IDs.

  2. 90% fail

    The duplication is within the same test's parametrization, not across tests.