test

Fix an error when `str.length` is greater than `length` #1425

Job	Run time
check-misc (head)	12s
test-memory (head)	40s
steep-check (head)	26s
test-ruby (head, master)	5m 53s
test-windows (head)	1m 42s
test-ruby (3.0, master)	5m 39s
ruby-versions / Generate Ruby versions	3s
test-cpp (head, g++)	15s
test (2.5)	26s
test-cpp (head, clang++)	21s
test (2.6)	29s
test (2.7)	28s
test (3.0)	16s
test (3.1)	16s
test (3.2)	19s
test (3.3)	16s
test (head)	13s
	17m 54s

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