python runtime_error ai_generated true

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

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

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-07-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.14.x active — — —

Root Cause

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

中文

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。

Workarounds

  1. 90% success 
    @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% success 
    def test_x(mocker):
    m = mocker.patch('myapp.notify.send')
    run_setup()  # called here, not in a fixture
    m.assert_called_with(1)

Dead Ends

Common approaches that don't work:

  1. 90% fail

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

  2. 85% fail

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