Update io module to more complex test case #299

Job	Run time
Run tests on ubuntu-latest with Python 3.8	3m 7s
Run tests on ubuntu-latest with Python 3.8	3m 5s
Run tests on ubuntu-latest with Python 3.8	3m 9s
Run tests on ubuntu-latest with Python 3.9	2m 47s
Run tests on ubuntu-latest with Python 3.9	3m 8s
Run tests on ubuntu-latest with Python 3.9	2m 58s
Run tests on ubuntu-latest with Python 3.10	2m 50s
Run tests on ubuntu-latest with Python 3.10	2m 55s
Run tests on ubuntu-latest with Python 3.10	2m 48s
Run tests on ubuntu-latest with Python 3.11	2m 31s
Run tests on ubuntu-latest with Python 3.11	2m 35s
Run tests on ubuntu-latest with Python 3.11	2m 28s
Run tests on ubuntu-latest with Python 3.12	2m 53s
Run tests on ubuntu-latest with Python 3.12	3m 7s
Run tests on ubuntu-latest with Python 3.12	2m 57s
	43m 18s

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