chore(test): add tests (manual) for isatty terminal function #42

Job	Run time
test (ubuntu-20.04, 5.1)	17s
test (ubuntu-20.04, 5.2)	17s
test (ubuntu-20.04, 5.3)	18s
test (ubuntu-20.04, 5.4)	17s
test (ubuntu-20.04, luajit)	17s
test (ubuntu-20.04, luajit-openresty)	17s
test (macos-11.0, 5.1)	1m 44s
test (macos-11.0, 5.2)	49s
test (macos-11.0, 5.3)	48s
test (macos-11.0, 5.4)	49s
test (macos-11.0, luajit)	49s
test (macos-11.0, luajit-openresty)	53s
test (macos-latest, 5.4)	39s
test (windows-latest, 5.1, msvc)	56s
test (windows-latest, 5.2, msvc)	58s
test (windows-latest, 5.3, msvc)	57s
test (windows-latest, 5.4, msvc)	1m 15s
test (windows-latest, luajit, mingw)	1m 2s
	13m 22s

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