python config_error ai_generated true

值错误：重复的测试ID：'test_case_0'

ValueError: duplicate test IDs: 'test_case_0'

ID: python/pytest-parametrize-ids-duplicate

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2025-08-01首次发现

版本兼容性

版本状态引入弃用备注
7.0.0 active — — —
8.0.0 active — — —

根因分析

当使用pytest.mark.parametrize并设置ids参数时，重复的ID字符串会导致错误，因为参数化测试中的测试ID必须唯一。

English

When using pytest.mark.parametrize with ids parameter, duplicate ID strings cause an error because test IDs must be unique within a parametrized test.

generic

解决方案

  1. 95% 成功率 Ensure all IDs in the ids list are unique 
    @pytest.mark.parametrize('x', [1, 2, 3], ids=['case_1', 'case_2', 'case_3'])
def test_example(x):
    ...
Each ID must be different.
  2. 90% 成功率 Use a function to generate unique IDs based on the parameter values 
    def id_func(val):
    return f'x={val}'
@pytest.mark.parametrize('x', [1, 2, 3], ids=id_func)
def test_example(x):
    ...
This ensures uniqueness.

无效尝试

常见但无效的做法:

  1. Removing the ids parameter entirely 40% 失败

    This loses descriptive test names, making test output harder to read.

  2. Using a lambda function that returns a constant string 70% 失败

    This will still produce duplicate IDs if the lambda ignores input.