Remove subprocess calls from tests (#251) #56

Job	Run time
matrix-coverage / coverage (ubuntu-latest, 3.11)	2m 17s
matrix-coverage / coverage (macos-14, 3.11)	1m 53s
matrix-coverage / coverage (macos-13, 3.12)	4m 11s
matrix-coverage / coverage (ubuntu-latest, 3.13)	2m 22s
matrix-coverage / coverage (macos-13, 3.13)	3m 7s
matrix-coverage / coverage (windows-latest, 3.12)	4m 23s
matrix-coverage / coverage (macos-14, 3.12)	2m 18s
matrix-coverage / coverage (windows-latest, 3.11)	4m 46s
matrix-coverage / coverage (ubuntu-latest, 3.12)	2m 14s
matrix-coverage / coverage (macos-13, 3.11)	3m 27s
matrix-coverage / coverage (macos-14, 3.13)	1m 58s
matrix-coverage / coverage (windows-latest, 3.13)	4m 4s
	37m 0s

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