Tests

Merge pull request #549 from n0h0/add-group-id-formatting #1438

Job	Run time
test (ruby=2.7)	31s
test (ruby=2.7, concurrency=async-websocket)	32s
test (ruby=3.0)	19s
test (ruby=3.1)	20s
test (ruby=3.2)	18s
test (ruby=3.3)	21s
test (ruby=3.4)	20s
test (ruby=ruby-head)	26s
test (ruby=jruby-head)	1m 53s
coveralls	3s
	5m 3s

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