✅ Fix incorrect mocking in unit tests (issue #1780)#1781
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tiangolo merged 2 commits intofastapi:masterfrom Jan 22, 2026
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✅ Fix incorrect mocking in unit tests (issue #1780)#1781tiangolo merged 2 commits intofastapi:masterfrom
tiangolo merged 2 commits intofastapi:masterfrom
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YuriiMotov
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LGTM
I suggest removing several lines to simplify tests (I tested it locally - it doesn't break tests).
Currently if you replace session.exec(select(1)) in this line with pass, this assertion will not fail as it's expected.
This PR fixes mocking the Session and after applying it, that test will not only ensure that there was no exception in init, but also that select(1) was actually called.
The same for https://github.com/fastapi/full-stack-fastapi-template/blob/master/backend/app/tests/scripts/test_test_pre_start.py
@vicaya, thank you!
Could you please take a look at my suggested changes? (done)
YuriiMotov
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Resolve fastapi#1780
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Fix issue #1780: the 2
test_init_successful_connectiontests were basically noops due to misuse of MagicMock.The errors went undetected until python 3.12+ tightened up the MagicMock implementation.