Fix tests #234

Job	Run time
rubocop	9s
Unit test (ubuntu-20.04, 3)	1m 45s
Unit test (ubuntu-20.04, 3.1)	1m 52s
Unit test (ubuntu-20.04, 3.2)	1m 53s
Unit test (ubuntu-20.04, 3.3)	1m 51s
Unit test (ubuntu-20.04, 3.4)	1m 47s
Unit test (ubuntu-20.04, jruby-9.4)	2m 27s
Unit test (ubuntu-20.04, truffleruby)	3m 45s
Unit test (macos-latest, 3)	1m 46s
Unit test (macos-latest, 3.1)	2m 4s
Unit test (macos-latest, 3.2)	1m 35s
Unit test (macos-latest, 3.3)	1m 38s
Unit test (macos-latest, 3.4)	1m 46s
Unit test (macos-latest, jruby-9.4)	2m 3s
Unit test (macos-latest, truffleruby)	3m 4s
Unit test (windows-latest, 3)	3m 44s
Unit test (windows-latest, 3.1)	3m 42s
Unit test (windows-latest, 3.2)	3m 30s
Unit test (windows-latest, 3.3)	5m 11s
Unit test (windows-latest, 3.4)	6m 33s
finish	0s
	52m 5s

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