python runtime_error ai_generated true

AssertionError: 未引发 ValueError

AssertionError: ValueError not raised

ID: python/unittest-assertraises-no-exception

其他格式: JSON · Markdown 中文 · English

80%修复率

88%置信度

0证据数

2024-02-27首次发现

版本兼容性

版本	状态	引入	弃用	备注
3.10	active	—	—	—
3.11	active	—	—	—
3.12	active	—	—	—

根因分析

self.assertRaises(ValueError) 作为上下文管理器使用，但被测代码未引发异常，或异常在函数内部被捕获并吞掉。

English

self.assertRaises(ValueError) was used as a context manager but the code under test did not raise, or the exception was caught and swallowed inside the function.

generic

解决方案

90% 成功率

with self.assertRaises(ValueError) as ctx:
    parse('bad-input')
self.assertIn('bad-input', str(ctx.exception))

92% 成功率

import pytest

def test_parse_raises():
    with pytest.raises(ValueError, match=r'bad-input'):
        parse('bad-input')

无效尝试

常见但无效的做法:

85% 失败
Inverts the logic: except catches the expected exception and calls fail, so a correct raise now fails the test.
75% 失败
Broadens the assertion so much that any unrelated error (e.g. TypeError) passes the test, masking real bugs.