python runtime_error ai_generated true

AssertionError: assert '2026-03-01' == '2024-01-01' # 测试内 datetime.now() 未被冻结

AssertionError: assert '2026-03-01' == '2024-01-01' # datetime.now() not frozen inside test

ID: python/pytest-freeze-time-not-active

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80%修复率

83%置信度

0证据数

2024-11-29首次发现

版本兼容性

版本	状态	引入	弃用	备注
1.x	active	—	—	—

根因分析

freezegun 的 freeze_time 装饰器在导入时补丁 datetime，但被测代码使用 'from datetime import datetime' 导入，在补丁之前就绑定了原始类。被补丁的模块级 datetime 未被使用。

English

freezegun's freeze_time decorator patches datetime at import time, but the code under test imported datetime as 'from datetime import datetime', binding the original class before the patch. The patched module-level datetime is not used.

generic

解决方案

92% 成功率

import datetime

def get_date():
    return datetime.datetime.now().date()

88% 成功率

import time_machine
from datetime import datetime

@time_machine.travel('2024-01-01')
def test_date():
    assert datetime.now().date().isoformat() == '2024-01-01'

无效尝试

常见但无效的做法:

80% 失败
Time is not the issue; the reference is bound to the unpatched class regardless of duration.
70% 失败
time-machine also patches the datetime module; the pre-bound reference still points to the original.