test

Add IO#ttyname that returns the tty name or nil #1345

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.6, ubuntu-latest)	31s
test (2.6, macos-latest)	48s
test (2.6, windows-latest)	3m 0s
test (2.7, ubuntu-latest)	27s
test (2.7, macos-latest)	33s
test (2.7, windows-latest)	3m 17s
test (3.0, ubuntu-latest)	15s
test (3.0, macos-latest)	17s
test (3.0, windows-latest)	1m 23s
test (3.1, ubuntu-latest)	17s
test (3.1, macos-latest)	26s
test (3.1, windows-latest)	1m 43s
test (3.2, ubuntu-latest)	17s
test (3.2, macos-latest)	21s
test (3.2, windows-latest)	2m 39s
test (3.3, ubuntu-latest)	24s
test (3.3, macos-latest)	30s
test (3.3, windows-latest)	2m 35s
test (head, ubuntu-latest)	13s
test (head, macos-latest)	18s
test (head, windows-latest)	1m 24s
test (jruby)	51s
test (jruby-head)	1m 5s
test (truffleruby)	19s
test (truffleruby-head)	27s
	24m 24s

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