CoverDAOTest - add tests to savecoverarts(qhash)
- add empty qhash
- add qhash with valid and new covers
- add qhash with existing covers
- checking qhash and qset sizes (qset size must be equal or less than qhash size)
CoverDAOTest - saveCoverArt(qhash...) - try saving a qhash with new and existing covers
CoverDAOTest - saveCoverArt(qhash...) - try saving a qhash with invalid covers (when md5hash is empty)
CoverDAOTest - saveCoverArt(qhash...) - try saving all kinds of covers (new, invalid and existing) at once
CoverDAOTest - cosmetic fix for saveCoverArt(qhash...) - making code more readable
- add method to do the qhash and qset iterations (avoiding repetitions)