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add a test for `b path: ...` #453

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.1)	40s
test (3.3)	46s
test (debug)	1m 4s
test (3.0)	44s
test (3.4)	47s
test (3.2)	50s
test (head)	43s
	5m 38s