Due to google/googletest#1419 [1], we had to add a comma after the last
argument of INSTANTIATE_TEST_CASE_P.
This was "fixed" in a backwards incompatible way in the googletest
project in 7c4164bf404d899b6d4c74beb1070da5647f55a2
[1]: https://github.com/google/googletest/issues/1419
The check of the maxlen and ellipsis condition was also moved to the
label creation, this way get_label_text doesn't need to care about the
restrictions placed on maxlen and ellipsis
