chore(test): add tests (manual) for isatty terminal function (#22) #47

Job	Run time
test (ubuntu-20.04, 5.1)	16s
test (ubuntu-20.04, 5.2)	20s
test (ubuntu-20.04, 5.3)	16s
test (ubuntu-20.04, 5.4)	16s
test (ubuntu-20.04, luajit)	15s
test (ubuntu-20.04, luajit-openresty)	16s
test (macos-11.0, 5.1)	53s
test (macos-11.0, 5.2)	53s
test (macos-11.0, 5.3)	48s
test (macos-11.0, 5.4)	48s
test (macos-11.0, luajit)	49s
test (macos-11.0, luajit-openresty)	49s
test (macos-latest, 5.4)	1m 3s
test (windows-latest, 5.1, msvc)	49s
test (windows-latest, 5.2, msvc)	1m 4s
test (windows-latest, 5.3, msvc)	1m 3s
test (windows-latest, 5.4, msvc)	1m 5s
test (windows-latest, luajit, mingw)	59s
	12m 42s

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