QMediaPlaylist auto test fails at random

tst_QMediaPlaylist::testLoaded_signal() fails at random, sometimes it passes other times it fails. The issue was seen on both i386 and armhf builders

• • • • • • • • • Start testing of tst_QMediaPlaylist *********
                  Config: Using QTest library 5.0.2, Qt 5.0.2
                  PASS : tst_QMediaPlaylist::initTestCase()
                  PASS : tst_QMediaPlaylist::construction()
                  PASS : tst_QMediaPlaylist::append()
                  PASS : tst_QMediaPlaylist::insert()
                  PASS : tst_QMediaPlaylist::clear()
                  PASS : tst_QMediaPlaylist::removeMedia()
                  PASS : tst_QMediaPlaylist::currentItem()
                  FAIL! : tst_QMediaPlaylist::saveAndLoad() 'res' returned FALSE. ()
                  Loc: [tst_qmediaplaylist.cpp(379)]
                  PASS : tst_QMediaPlaylist::loadM3uFile()
                  PASS : tst_QMediaPlaylist::playbackMode(Sequential, 0)
                  PASS : tst_QMediaPlaylist::playbackMode(Sequential, 1)
                  PASS : tst_QMediaPlaylist::playbackMode(Sequential, 2)
                  PASS : tst_QMediaPlaylist::playbackMode(Loop, 0)
                  PASS : tst_QMediaPlaylist::playbackMode(Loop, 1)
                  PASS : tst_QMediaPlaylist::playbackMode(Lopp, 2)
                  PASS : tst_QMediaPlaylist::playbackMode(ItemOnce, 1)
                  PASS : tst_QMediaPlaylist::playbackMode(ItemInLoop, 1)
                  PASS : tst_QMediaPlaylist::shuffle()
                  PASS : tst_QMediaPlaylist::readOnlyPlaylist()
                  PASS : tst_QMediaPlaylist::setMediaObject()
                  PASS : tst_QMediaPlaylist::testCurrentIndexChanged_signal()
                  PASS : tst_QMediaPlaylist::testCurrentMediaChanged_signal()
                  FAIL! : tst_QMediaPlaylist::testLoaded_signal() 'spy.size()== 1' returned FALSE. ()
                  Loc: [tst_qmediaplaylist.cpp(666)]
                  PASS : tst_QMediaPlaylist::testMediaChanged_signal()
                  PASS : tst_QMediaPlaylist::testPlaybackModeChanged_signal()
                  PASS : tst_QMediaPlaylist::testEnums()
                  PASS : tst_QMediaPlaylist::mediaPlayListProvider()
                  PASS : tst_QMediaPlaylist::mediaPlayListControl()
                  PASS : tst_QMediaPlaylist::mediaPlayListSourceControl()
                  PASS : tst_QMediaPlaylist::cleanupTestCase()
                  Totals: 28 passed, 2 failed, 0 skipped