public void CaseSensivity() { var charSet = new RangeSet <Codepoint>("aB".ToCodepoints()); Assert.True(charSet.Contains('a')); Assert.False(charSet.Contains('A')); Assert.False(charSet.Contains('b')); Assert.True(charSet.Contains('B')); Assert.False(charSet.Contains('c')); Assert.False(charSet.Contains('C')); charSet = charSet.CaseInsensitive(); Assert.True(charSet.Contains('a')); Assert.True(charSet.Contains('A')); Assert.True(charSet.Contains('b')); Assert.True(charSet.Contains('B')); Assert.False(charSet.Contains('c')); Assert.False(charSet.Contains('C')); }