Add test for code_point_limit #3

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (2.5, ubuntu-latest)	51s
test (2.5, macos-latest)	2m 6s
test (2.5, windows-latest)	5m 10s
test (2.6, ubuntu-latest)	1m 11s
test (2.6, macos-latest)	2m 0s
test (2.6, windows-latest)	6m 23s
test (2.7, ubuntu-latest)	1m 13s
test (2.7, macos-latest)	1m 38s
test (2.7, windows-latest)	5m 16s
test (3.0, ubuntu-latest)	24s
test (3.0, macos-latest)	54s
test (3.0, windows-latest)	3m 46s
test (3.1, ubuntu-latest)	28s
test (3.1, macos-latest)	54s
test (3.1, windows-latest)	3m 30s
test (3.2, ubuntu-latest)	22s
test (3.2, macos-latest)	46s
test (3.2, windows-latest)	4m 23s
test (head, ubuntu-latest)	24s
test (head, macos-latest)	48s
test (head, windows-latest)	3m 32s
test (jruby, ubuntu-latest)	1m 50s
test (jruby, macos-latest)	2m 0s
test (jruby, windows-latest)	5m 27s
test (jruby-head, ubuntu-latest)	2m 11s
test (jruby-head, macos-latest)	2m 28s
test (jruby-head, windows-latest)	3m 56s
test (windows-latest, ucrt)	2m 41s
test (windows-latest, mingw)	3m 17s
test (windows-latest, mswin)	1m 28s
	1h 11m 21s

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