refactor: drop test classes #264

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	37s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.10, locked, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 29s
checks / test (3.10, locked, windows-latest)	2m 19s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.11, locked, windows-latest)	2m 39s
checks / test (3.12, locked, windows-latest)	3m 27s
checks / test (3.11, lowest-direct, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	4m 14s
checks / test (3.10, lowest-direct, windows-latest)	2m 26s
checks / test (3.13, locked, windows-latest)	2m 23s
checks / test (3.13, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.14, lowest-direct, windows-latest)	2m 25s
checks / test (3.12, lowest-direct, windows-latest)	3m 50s
checks / test (3.13, locked, ubuntu-latest)	42s
checks / test (3.14, locked, ubuntu-latest)	2m 15s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.14, locked, windows-latest)	3m 11s
all-green	4s
	39m 48s

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