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October 31, 2026 21:53
Expose a MagicMock subclass that deep-copies positional and keyword arguments together before recording calls. Support both mock backends, child mocks, and the existing patch lifecycle. Closes pytest-dev#37
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Ordinary mocks store references to call arguments, so later mutations to a list or dictionary also change the recorded arguments.
Add
mocker.CopyingMockto deep-copy arguments before each call. It can be used directly or withmocker.patch(..., new_callable=mocker.CopyingMock).Positional and keyword arguments are copied together to preserve shared references and cycles. Both mock backends, child mocks, and the existing patch reset/cleanup behavior are supported.
Includes documentation and tests for mutable arguments, shared references, cycles, side effects, and objects that cannot be copied. Ordinary mocks remain unchanged.
Validation:
Closes #37