We don't want to have to rely on QDebug:toString() and the private
QFormDataPartBuilder::build() function for checks, so use the
framework originally introduced by Máté for the the moveSemantics()
test for picksUtf8NameEncodingIfAsciiDoesNotSuffice(), too.
Requires to revert the needles from QString back to QByteArray.
This completes the port away from QFormDataPartBuilder::build() use in
the tests, allowing us to remove the tst_QFormDataBuilder friend
declaration and unexport build().
Task-number: QTBUG-125985
Change-Id: Icae84f54c6f768e097b36b4c4f964eeb6d676809
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>
(cherry picked from commit d0b0fe76663a4c7fe007cb66afa936ea7fe3d918)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
e2ffa8ddf6