refactor: drop test classes (#1924) #270

Job	Run time
checks / pre-commit	34s
checks / readme-snippets	13s
checks / test (3.10, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, locked, windows-latest)	2m 20s
checks / test (3.11, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.12, locked, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, lowest-direct, windows-latest)	3m 34s
checks / test (3.13, lowest-direct, windows-latest)	2m 31s
checks / test (3.13, locked, ubuntu-latest)	43s
checks / test (3.10, lowest-direct, windows-latest)	2m 41s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.12, lowest-direct, ubuntu-latest)	48s
checks / test (3.12, locked, windows-latest)	3m 19s
checks / test (3.11, locked, windows-latest)	3m 20s
checks / test (3.10, locked, ubuntu-latest)	46s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.14, locked, windows-latest)	4m 0s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.14, locked, ubuntu-latest)	2m 18s
all-green	5s
	39m 33s

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