django.git/django/test/utils.py, branch stable/5.2.x

[5.2.x] Fixed #35967 -- Deferred test suite fixtures serialization after all dbs setup.

2025-02-16T12:43:38Z

While the top-level objects fed to serialization are bound to the test database being created nothing prevents code invoked during serialization from performing queries against other connections entries that haven't been swapped yet. The reported example of that is a database router directing all reads to a test mirror for a set of models involving auto-created many-to-many fields. It might be tempting to address the many-to-many field case but this a symptom of a larger problem where the test framework yields the flow execution to user code that could interact with non-test databases in unexpected ways. Deferring test database fixture serialization until the point where all connections entries have been swapped for their test equivalent ensures that no code triggered during serialization can interact with non-test databases. Thanks Jake Howard for the report and Jacob Walls for the initial investigation. Backport of dc69a63f844b2ef3bc3371edde91644cf0bef0ee from main

Refs #34986 -- Moved garbage_collect() helper to django.test.utils.

2023-12-06T08:26:11Z

Fixed typo in django/test/utils.py.

2023-07-27T04:56:38Z

Refs #32446 -- Removed SERIALIZE test database setting per deprecation timeline.

2023-01-17T10:49:15Z

Refs #34118 -- Adopted asgiref coroutine detection shims.

2022-12-20T10:10:48Z

Thanks to Mariusz Felisiak for review.

Used more augmented assignment statements.

2022-10-31T11:30:13Z

Identified using the following command: $ git grep -I '$\<[_a-zA-Z0-9]\+\>$ *= *\1 *[-+/*^%&|<>@]'

Refs #33476 -- Refactored code to strictly match 88 characters line length.

2022-02-07T19:37:05Z

Refs #33476 -- Reformatted code with Black.

2022-02-07T19:37:05Z

Refs #20349 -- Avoided loading testing libraries when not needed.

2022-01-25T10:41:01Z

Refs #32655 -- Improved error if iter_test_cases() is passed a string.

2021-06-29T18:41:40Z