Add unit tests for thumbnail, avatar and ringtone details
Add unit tests for thumbnail, avatar and ringtone details

Ensures that thumbnail details are unique and irremovable, and that
avatar and ringtone details are handled correctly.

Relates to task QTMOBILITY-92 and also QTMOBILITY-91.

KDE/android-qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,tmcguire/qt-mobility,qtproject/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,kaltsi/qt-mobility,KDE/android-qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility,tmcguire/qt-mobility,tmcguire/qt-mobility,KDE/android-qt-mobility,kaltsi/qt-mobility,tmcguire/qt-mobility,kaltsi/qt-mobility,KDE/android-qt-mobility,kaltsi/qt-mobility,enthought/qt-mobility,qtproject/qt-mobility