When I split Qt::partial_ordering off of QPartialOrdering, O
duplicated the partialOrdering() test, but lost the conversion() part
of the tests.
This patch brings them back.
Because we maintained the test coverage for Qt::partial_ordering, it
suffices to check that QPartialOrdering::X correctly maps to
std::partial_ordering::x. The rest follows from transtivity of
equality.
We're still lacking conversions of QPartialOrdering to Qt::_ordering
types. That will be the subject of a follow-up patch.
Amends 4b6f757020.
Change-Id: I1938d09f696ed8d58143dbacccb72cfd54ca12dd
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
6e41101217