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Fix RSpec/UnspecifiedException RuboCop offenses #502

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Job	Run time
test (3.0)	2m 0s
rubocop	16s
test (3.1)	1m 55s
test (3.2)	1m 54s
test (jruby-9.4)	17m 33s
test (3.3)	2m 7s
	25m 45s