Github user PascalSchumacher commented on a diff in the pull request: https://github.com/apache/commons-text/pull/50#discussion_r122292528 --- Diff: src/test/java/org/apache/commons/text/CharacterPredicatesTest.java --- @@ -44,4 +44,77 @@ public void testDigits() { assertFalse(CharacterPredicates.DIGITS.test('.')); assertFalse(CharacterPredicates.DIGITS.test('L')); } + + @Test + public void testArabicNumerals() { --- End diff -- I personally do not like junit parametrized tests because every test method has to be in its own class and you have to a lot of boiler plate. For parametrized test I use https://github.com/TNG/junit-dataprovider Theories can be nice for testing methods with multiple parameters, although in my opinion well chosen parameter combinations are often enough. I think theories are a bit lacking compared to "real" property based testing like quick-check (no test data generation, no failure shrinking). For java https://github.com/pholser/junit-quickcheck is the best option I'm aware of, but it has been requiring java 8 for years.
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