Add tests for CliEnv #3451

Job	Run time
tox env type on ubuntu-latest	40s
test 3.12 on ubuntu-latest	4m 41s
tox env type on windows-latest	1m 24s
test 3.12 on windows-latest	14m 11s
tox env dev on ubuntu-latest	39s
test 3.12 on macos-latest	8m 20s
test 3.11 on ubuntu-latest	3m 3s
tox env dev on windows-latest	1m 19s
test 3.11 on windows-latest	8m 35s
tox env docs on ubuntu-latest	1m 8s
test 3.11 on macos-latest	9m 11s
tox env docs on windows-latest	1m 34s
test 3.10 on ubuntu-latest	3m 13s
tox env pkg_meta on ubuntu-latest	30s
test 3.10 on windows-latest	10m 11s
test 3.10 on macos-latest	6m 49s
test 3.9 on ubuntu-latest	3m 29s
test 3.9 on windows-latest	10m 41s
test 3.9 on macos-latest	7m 20s
test 3.8 on ubuntu-latest	3m 18s
test 3.8 on windows-latest	11m 13s
test 3.8 on macos-latest	9m 4s
	2h 0m 33s

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