While porting some of these tests to QUtf8StringView, Thiago suggested to add the comparison tests from qcomparisontesthelper_p.h. Pick-to: 6.9 6.8 Change-Id: Id8f2c1c5690f7219ac000eebb637f48acbc5662d Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>