Add and update specs for IO methods #2487

Job	Run time
RuboCop	51s
specs (macos, 3.3.11)	2m 3s
specs (ubuntu, 3.3.11)	1m 49s
specs (windows, 3.4.9)	3m 6s
specs (windows, 3.3.11)	3m 13s
specs (ubuntu, 3.4.9)	1m 41s
specs (ubuntu, 4.0.4, --repeat 2)	2m 12s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 42s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 32s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 34s
specs (ubuntu, 4.0.4)	1m 33s
specs (macos, 4.0.4)	1m 58s
specs (macos, 3.4.9)	1m 58s
specs (windows, 4.0.4)	3m 22s
	28m 34s

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