test: improve function test coverage #4

Job	Run time
Build documentation	48s
Tests (Python 3.12)	26s
Lint (black, isort, flake8, mypy, import-linter)	40s
Functional tests (MSSQL + Postgres, no Oracle)	1m 16s
Functional tests (Oracle, on-demand)	0s
	3m 10s

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