add test that will cause error #226

[PetrDlouhy]

Description

For now this only adds test for error #226. Should work in Django 4.0 and fail in 4.1.

Rationale

To be able to fix #226 and not introduce that error again.

[Andrew-Chen-Wang]

Does #225 resolve this?

[PetrDlouhy]

@Andrew-Chen-Wang Seems yes. Seems like this might be the test needed in that PR. There is probably only last issue unsolved for this PR - the filebased sqlite3 tests got broken for some reason after introducing the new admin_tests app.

[coveralls]

Pull Request Test Coverage Report for Build 4389438568

• 36 of 36 (100.0%) changed or added relevant lines in 5 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 96.99%

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Files with Coverage Reduction	New Missed Lines	%
cachalot/init.py	1	83.33%
cachalot/utils.py	2	92.12%
<!--	Total:	3		-->

Totals
Change from base Build 2937621086:	-0.2%
Covered Lines:	709
Relevant Lines:	731

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 4389438568

• 36 of 36 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 97.335%

---

Totals
Change from base Build 2937621086:	0.1%
Covered Lines:	694
Relevant Lines:	713

---

💛 - Coveralls

[PetrDlouhy]

@Andrew-Chen-Wang Seems like rebasing onto commits from #225 fix both the tests that were supposed to fail without fix and those that got broken by introducing new app. Now it should be ready.

[Andrew-Chen-Wang]

lgtm, looks like adding #225 worked like a charm. Will merge this at home and make a new release. Thanks for adding tests!