Method addToFavoriteSongs of CDPlayer tested on NotSelectingCDWechseler -> shouldThrowAnException.

src/main/java/device/cdPlayer/CDPlayer.java

@@ -167,6 +167,9 @@ public class CDPlayer implements Device {
         this.loadedCD=CDList.get(nextIndex);
     }
     public void addToFavoriteSongs(String song){
+        if(activeSource.equals("CDDrive")){
+            throw new CDWechselerNotRunningException();
+        }
         if(!(favoriteSongs.contains(song))) {
             favoriteSongs.add(song);
         }

src/test/java/device/cdPlayer/CDPlayerTest.java

@@ -506,6 +506,11 @@ class CDPlayerTest {
             _cdPlayer.addToFavoriteSongs(myFavoriteSong2);
             assertThat(_cdPlayer.getFavoriteSongs().size()>1).describedAs(testName).isNotEqualTo(true);
         }
+        if(cases.equals("Case3")) {
+            String myFavoriteSong1 = _cdPlayer.getCD().getPlayList()[0];
+            Exception newException = assertThrows(exception.getClass(), () -> _cdPlayer.addToFavoriteSongs(myFavoriteSong1));
+            assertEquals(CDWechselerNotRunningException.class, newException.getClass());
+        }
     }
     static Stream<Arguments> addToFavoriteSongsData () {
         String[] audioPlayList = new String[]{"Audio 01", "Audio 02", "Audio 03", "Audio 04", "Audio 05"};
@@ -517,9 +522,12 @@ class CDPlayerTest {
         cdPlayer1.loadCDWechseler(audioCD1, 0);
         cdPlayer1.loadCDWechseler(audioCD2, 1);
 
+        CDPlayer cdPlayer2 = new CDPlayer();
+        cdPlayer2.setCD(audioCD2);
         return Stream.of(
                 Arguments.of("[addToFavoriteSongs() by addingOneSong] => favoriteSongsShouldReturnsThatAddedSong", "Case1", cdPlayer1, null),
-                Arguments.of("[addToFavoriteSongs() by addingDuplicatedSong] => SongShouldNotBeAdded", "Case2", cdPlayer1, null)
+                Arguments.of("[addToFavoriteSongs() by addingDuplicatedSong] => SongShouldNotBeAdded", "Case2", cdPlayer1, null),
+                Arguments.of("[addToFavoriteSongs() by NotSelectingCDWechseler] => shouldThrowAnException", "Case3", cdPlayer2, new CDWechselerNotRunningException())
         );
     }