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 escapesBackslashAndQuotesInFilenameAndName(), too.
Requires to actually open dummy_file (so make it a QBuffer, because
there's no file of that name in the filesystem) and to revert the
needles from QString back to QByteArray.
Task-number: QTBUG-125985
Change-Id: I888b3cac45ed24b2e877dc1642a95e3f1d64f2ff
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>
(cherry picked from commit 14f68c9d44472966a66b5cf3b16f4fc7f60068ca)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
95590adb55