test: add tests for util functions #1170

Job	Run time
pytest on linux (3.13)	1m 58s
lint commit message	32s
pytest on linux (3.11)	1m 40s
linting-linux	24s
mypy check on linux (3.11)	1m 1s
pytest on linux (3.10)	1m 34s
mypy check on linux (3.13)	59s
pytest on linux (3.12)	2m 6s
build python package	34s
build latest docs	1m 11s
mypy check on linux (3.10)	59s
mypy check on linux (3.12)	58s
conda package build	56s
test coverage	4s
publish python package	0s
build & publish docs	0s
merge current tag to main branch	0s
publish python package to anaconda	0s
	14m 56s

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