Catalog catalog = new Catalog();

        Song InMyMind = new Song("In my mind", 2018, new Singer("Dynoro"),
                        new Genre("dance", new Genre("pop")), new Album("In my mind"));
        catalog.addSong(InMyMind);

        Song InSomeoneElseMind = new Song("In someone else mind", 2019, new Singer("Dynoro"),
                                 new Genre("EasyListening", new Genre("pop")), new Album("In my mind"));
        catalog.addSong(InSomeoneElseMind);

        Song SweetDreams = new Song("Sweet dreams", 2017, new Singer("Dwin & Echo"),
                           new Genre("electro", new Genre("pop")), new Album("Sweet dreams"));
        catalog.addSong(SweetDreams);

        Song Fireball = new Song("Fireball", 2015, new Singer("Synapson"), new Genre("pop"),
                        new Album("Convergence"));
        catalog.addSong(Fireball);

        Song SongName = new Song("Song name", 2017, new Singer("Some singer"),
                        new Genre("rock"), new Album("album name"));
        catalog.addSong(SongName);

        Song AnotherSong = new Song("Another song", 2017, new Singer("Dynoro"),
                           new Genre("hardrock", new Genre("rock")), new Album("In my mind"));
        catalog.addSong(AnotherSong);

        Song Song2 = new Song("Song 2", 2015, new Singer("Some singer"), new Genre("rock"),
                     new Album("album name"));
        catalog.addSong(Song2);

        SongsCollection musicForRunning = new SongsCollection("musicForRunning");
        musicForRunning.addSong(InMyMind);
        musicForRunning.addSong(Song2);
        musicForRunning.addSong(InSomeoneElseMind);
        catalog.addSongsCollection(musicForRunning);

        SongsCollection club = new SongsCollection("Club");
        club.addSong(SweetDreams);
        catalog.addSongsCollection(club);

        SongsCollection rockForLoosers = new SongsCollection("RockForLoosers");
        rockForLoosers.addSong(AnotherSong);
        catalog.addSongsCollection(rockForLoosers);

        SongsCollection bestElectro2018 = new SongsCollection("bestElectro2018");
        bestElectro2018.addSong(Fireball);
        bestElectro2018.addSong(InMyMind);
        catalog.addSongsCollection(bestElectro2018);

        SearchEngine searchEngine = new SearchEngine(catalog);

        //------------------------------------Test from conditions of this problem--------------------------------------//

        Album.printSet(searchEngine.findAlbumsBySongs(new SearchEngine(new Catalog(searchEngine.findSongsByGenre(new Genre("rock")))).findSongsEqualsYear(2017)));
        SongsCollection.printSet(searchEngine.findSongsCollectionBySongs(new SearchEngine(new Catalog(searchEngine.findSongsByGenre(new Genre("rock")))).findSongsEqualsYear(2017)));

        //-------------------------------------------Songs search tests-------------------------------------------------//

        Song.printSet(searchEngine.findSongsBySinger(new Singer("Dynoro")));

        Song.printSet(searchEngine.findSongsByAlbum(new Album("album name")));

        Song.printSet(searchEngine.findSongsByCollection(musicForRunning));

        Song.printSet(searchEngine.findSongsByGenre(new Genre("pop")));

        Song.printSet(searchEngine.findSongsEqualsYear(2015));

        Song.printSet(searchEngine.findSongsLessThanYear(2016));

        Song.printSet(searchEngine.findSongsMoreThanYear(2016));

        Song.printSet(new SearchEngine(new Catalog(new SearchEngine(new Catalog(searchEngine.findSongsByGenre(new Genre("pop")))).findSongsByAlbum(new Album("In my mind")))).findSongsLessThanYear(2019));

        Song.printSet(searchEngine.findSongsBySinger(searchEngine.findSingerBySong(InMyMind)));

        //------------------------------------------Singers search tests------------------------------------------------//

        System.out.println(searchEngine.findSingerBySong(Song2));
        System.out.println();

        System.out.println(searchEngine.findSingerByAlbum(new Album("In my mind")));
        System.out.println();

        Singer.printSet(searchEngine.findSingersByGenre(new Genre("rock")));

        Singer.printSet(searchEngine.findSingersBySongCollection(bestElectro2018));

        //-----------------------------------------Albums search tests--------------------------------------------------//

        Album.printSet(searchEngine.findAlbumsBySinger(new Singer("Synapson")));

        System.out.println(searchEngine.findAlbumBySong(Song2));
        System.out.println();

        Album.printSet(searchEngine.findAlbumsByGenre(new Genre("pop")));

        Album.printSet(searchEngine.findAlbumsBySongs(searchEngine.findSongsLessThanYear(2017)));

        //-------------------------------------SongsCollections search tests--------------------------------------------//

        SongsCollection.printSet(searchEngine.findSongsCollectionsBySinger(new Singer("Synapson")));

        SongsCollection.printSet(searchEngine.findSongsCollectionsBySong(InMyMind));

        SongsCollection.printSet(searchEngine.findSongsCollectionsByGenre(new Genre("pop")));

        SongsCollection.printSet(searchEngine.findSongsCollectionBySongs(searchEngine.findSongsByGenre(new Genre("rock"))));

        //----------------------------------------Genres search tests---------------------------------------------------//

        Genre.printSet(searchEngine.findGenresBySinger(new Singer("Dynoro")));

        System.out.println(searchEngine.findGenreBySong(Song2));
        System.out.println();

        Genre.printSet(searchEngine.findGenresByAlbum(new Album("In my mind")));

        Genre.printSet(searchEngine.findGenresBySongsCollection(new SongsCollection("bestElectro2018")));