public void importArtistTopTracksNotPossibleTwice() {
Calltype TOP = Calltype.ARTIST_GET_TOP_TRACKS;
Artist artist1 = new Artist("Esben And The Witch");
Artist artist2 = new Artist("Espers");
Artist artist3 = new Artist("Essie Jain");
WebserviceInvocation topArtist1 = new WebserviceInvocation(TOP, artist1);
WebserviceInvocation topArtist2 = new WebserviceInvocation(TOP, artist2);
WebserviceInvocation topArtist3 = new WebserviceInvocation(TOP, artist3);
deleteWebserviceInvocations();
// possible for all of them
assertTrue(dao.isWebserviceInvocationAllowed(topArtist1));