python runtime_error ai_generated true

AssertionError: assert 0 == 1 # 使用 -p no:xdist 通过，使用 -n auto 失败

AssertionError: assert 0 == 1 # passes with -p no:xdist, fails with -n auto

ID: python/pytest-xdist-order-dependent

其他格式: JSON · Markdown 中文 · English

80%修复率

85%置信度

0证据数

2024-06-25首次发现

版本兼容性

版本	状态	引入	弃用	备注
3.x	active	—	—	—
4.x	active	—	—	—

根因分析

测试共享全局状态（模块级字典、单例或数据库行），一个测试修改后被另一个测试依赖。pytest-xdist 将测试分发到不同 worker，破坏了隐式顺序。

English

Tests share global state (module-level dict, singleton, or DB row) that is mutated by one test and relied upon by another. pytest-xdist distributes tests across workers, breaking the implicit ordering.

generic

解决方案

92% 成功率

@pytest.fixture(autouse=True)
def reset_state():
    mypkg.cache.clear()
    yield
    mypkg.cache.clear()

80% 成功率
```
pytest -n auto --dist=loadscope
```

无效尝试

常见但无效的做法:

70% 失败
Hides the underlying state leak and defeats the purpose of using xdist for speed.
80% 失败
Shuffling makes the flakiness worse and harder to reproduce, not better.