Add specs for the it variable in blocks #1824

Job	Run time
RuboCop	31s
specs (ubuntu, 3.0.6)	1m 32s
specs (ubuntu, 3.1.4)	1m 29s
specs (ubuntu, 3.2.2)	1m 29s
specs (ubuntu, 3.3.0)	1m 25s
specs (macos, 3.0.6)	1m 39s
specs (macos, 3.1.4)	1m 32s
specs (macos, 3.2.2)	1m 31s
specs (macos, 3.3.0)	1m 32s
specs (windows, 3.0.6)	5m 0s
specs (windows, 3.1.4)	5m 14s
specs (windows, 3.2.2)	4m 0s
specs (windows, 3.3.0)	3m 50s
specs (ubuntu, 3.3.0, --enable-frozen-string-literal)	1m 27s
	32m 11s

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