Currently when doing comparison with pair-like classes the fallback
toString method is called which returns a Q_NULLPTR thus not allowing
proper diagnostic of the values that triggered an error. This patch
adds support for QPair and std::pair to improve the tests output
readability.
[ChangeLog][QtTest][QCOMPARE] Now outputs contents of QPair and
std::pair on failure.
Change-Id: Ib0b4aad7640590d56275b6f1306fb9fb39fa81bc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
