Add exit code tests #35

Job	Run time
test (ubuntu-latest, 26.3, false)	32s
test (ubuntu-latest, 27.2, false)	32s
test (ubuntu-latest, 28.2, false)	32s
test (ubuntu-latest, 29.4, false)	1m 12s
test (macos-latest, 28.2, false)	1m 9s
test (macos-latest, 29.4, false)	1m 21s
test (windows-latest, 26.3, false)	2m 34s
test (windows-latest, 27.2, false)	1m 51s
test (windows-latest, 28.2, false)	1m 51s
test (windows-latest, 29.4, false)	4m 16s
test (ubuntu-latest, snapshot, true)	28s
test (macos-latest, snapshot, true)	1m 21s
test (windows-latest, snapshot, true)	4m 5s
	21m 44s

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