Add and update specs for IO methods #2490

Job	Run time
RuboCop	53s
specs (macos, 3.3.11)	1m 24s
specs (ubuntu, 4.0.4)	1m 33s
specs (macos, 4.0.4)	2m 11s
specs (ubuntu, 4.0.4, --enable-frozen-string-literal)	1m 39s
specs (ubuntu, 3.4.9)	1m 40s
specs (ubuntu, 4.0.4, --repeat 2)	2m 22s
specs (ubuntu, 4.0.4, --parser=parse.y)	1m 32s
specs (windows, 3.3.11)	3m 17s
specs (ubuntu, 3.3.11)	1m 8s
specs (ubuntu, 4.0.4, LC_ALL=C)	1m 32s
specs (windows, 3.4.9)	3m 39s
specs (windows, 4.0.4)	3m 39s
specs (macos, 3.4.9)	1m 26s
	27m 55s

Navigation Menu