python runtime_error ai_generated true

AssertionError: 未找到预期调用。 预期: send(1) 实际: 未被调用。

AssertionError: expected call not found. Expected: send(1) Actual: not called.

ID: python/pytest-mock-mocker-scope-mismatch

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80%修复率
83%置信度
0证据数
2024-07-14首次发现

版本兼容性

版本状态引入弃用备注
3.14.x active — — —

根因分析

mocker.patch 在函数作用域的 fixture 中应用，但被 patch 的调用发生在会话作用域 setup 中，该 setup 在 patch 安装之前已执行。

English

mocker.patch was applied inside a fixture with function scope, but the patched call happens in a session-scoped setup that ran before the patch was installed.

generic

解决方案

  1. 90% 成功率 
    @pytest.fixture(scope='session')
def patched_send():
    with mock.patch('myapp.notify.send') as m:
        yield m

def test_x(patched_send):
    run_setup()
    patched_send.assert_called_with(1)
  2. 93% 成功率 
    def test_x(mocker):
    m = mocker.patch('myapp.notify.send')
    run_setup()  # called here, not in a fixture
    m.assert_called_with(1)

无效尝试

常见但无效的做法:

  1. 90% 失败

    The mock was never called in the first place; resetting does not retroactively capture calls that happened before patching.

  2. 85% 失败

    create=True only bypasses AttributeError; the timing problem (patch applied after the call) is unchanged.