Where does FreeBSD tr -C differ from tr -c?

[Sebastian Feld]

On Sat, Apr 6, 2013 at 5:33 PM, Andrey Chernov <ache at freebsd.org> wrote:
> On 06.04.2013 17:02, Cedric Blancher wrote:
>> On 6 April 2013 14:58, Cedric Blancher <cedric.blancher at googlemail.com> wrote:
>>> On 6 April 2013 11:38, Andrey Chernov <ache at freebsd.org> wrote:
>>>> On 06.04.2013 2:10, Cedric Blancher wrote:
>>>>>> I tried this (ksh93) test script but it NEVER produces a difference in
>>>>>> the en_US.utf8 and fr_FR.utf-8 locales:
>>>>
>>>>> Anyone? FreeBSD tr implements option -C but there are no usage
>>>>> *examples* where exactly it differs from -c.
>>>>
>>>> For -C you need multibyte locale.
>>>
>>> I know. I'm looking for examples in whatever locale is suitable for
>>> such locales (fr_FR.UTF-8 or en_US.UTF-8 preferred).
>>
>> ...whatever locale is suitable for such *examples* [not locales]....
>
> Try with Chinese or Japanese ones, non utf-8 first.

FreeBSD tr implements tr -C. There are supposed to be tests to verify
this, right?