Tests for null value specified using javax.persistence.Parameter#getParameterType() (introduced via HHH-10161) fail on Sybase, because Sybase treats null as equal to null

That means,
insert into test values(null);
select * from test where id = null;

The SELECT will return the value added by the INSERT. This behavior is different from all other databases that we support. On other databases, you have to query whether "is null", not "= null". 

I believe this is just a database-specific behavior that Hibernate can't really do anything about, so I suggest to skip these failing tests.