With https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7527 an attempt was made to fix the wrapping of the TWCC 24-bit reference time. Unfortunately this fix was not correct due to a late change and the lack of unit tests to catch it. This time unit tests are provided to make sure we have a correct fix for all the edge cases. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9051>