test

Add `IO#ttyname` that returns the tty name or nil #1327

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (2.6, ubuntu-latest)	28s
test (2.6, macos-latest)	43s
test (2.6, windows-latest)	2m 59s
test (2.7, ubuntu-latest)	31s
test (2.7, macos-latest)	40s
test (2.7, windows-latest)	2m 53s
test (3.0, ubuntu-latest)	16s
test (3.0, macos-latest)	17s
test (3.0, windows-latest)	1m 33s
test (3.1, ubuntu-latest)	14s
test (3.1, macos-latest)	26s
test (3.1, windows-latest)	1m 6s
test (3.2, ubuntu-latest)	20s
test (3.2, macos-latest)	22s
test (3.2, windows-latest)	1m 33s
test (3.3, ubuntu-latest)	23s
test (3.3, macos-latest)	25s
test (3.3, windows-latest)	1m 47s
test (head, ubuntu-latest)	11s
test (head, macos-latest)	20s
test (head, windows-latest)	1m 16s
test (jruby)	49s
test (jruby-head)	51s
test (truffleruby)	18s
test (truffleruby-head)	23s
	21m 6s

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