add a test for `b path: ...` #1783

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (3.1)	1m 50s
test (3.3)	1m 53s
test (2.7)	1m 46s
test (3.0)	1m 49s
test (head)	1m 45s
test (3.2)	2m 3s
test (debug)	5m 58s
test (3.4)	1m 53s
ruby-versions / Generate Ruby versions	5s
test (3.0)	1m 59s
test (debug)	6m 10s
test (3.2)	1m 43s
test (head)	1m 39s
test (3.4)	1m 53s
test (2.7)	1m 46s
test (3.3)	1m 53s
test (3.1)	1m 50s
	38m 0s

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