test: improve function test coverage #5

Job	Run time
Tests (Python 3.12)	26s
Build documentation	31s
Functional tests (MSSQL + MySQL + Postgres, no Oracle)	59s
Lint (black, isort, flake8, mypy, import-linter)	37s
Functional tests (Oracle, on-demand)	-1s
	2m 32s

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