test

cleanup specify groups spec (#1006) #569

Job	Run time
build (3.2, windows-latest, spec)	7m 46s
build (3.1, windows-latest, spec)	4m 39s
build (3.1, ubuntu-latest, spec)	1m 13s
build (3.1, ubuntu-latest, rubocop)	8s
build (3.2, ubuntu-latest, spec)	3m 5s
build (jruby-head, windows-latest, spec)	1m 53s
build (3.3, ubuntu-latest, spec)	3m 2s
build (3.3, windows-latest, spec)	6m 13s
build (head, ubuntu-latest, spec)	7s
build (3.4, ubuntu-latest, spec)	2m 47s
build (jruby-head, ubuntu-latest, spec)	11m 51s
build (3.4, windows-latest, spec)	13m 59s
build (head, windows-latest, spec)	48s
	57m 31s

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