Method addToFavoriteSongs of CDPlayer tested on addingOneSong -> favoriteSongsShouldReturnsThatAddedSong.

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

@@ -23,6 +23,8 @@ public class CDPlayer implements Device {
     private CDWechseler cdWechseler=null;
     private String activeSource="CDDrive";//or CDWechseler
 
+    private List<String>favoriteSongs=new ArrayList<>();
+
     @Override
     public void louder() {
         if(volume < 100) {
@@ -164,6 +166,9 @@ public class CDPlayer implements Device {
         int nextIndex=(indexOfLoadedCD+1)%CDList.size();
         this.loadedCD=CDList.get(nextIndex);
     }
+    public void addToFavoriteSongs(String song){
+        favoriteSongs.add(song);
+    }
 
     //Getters, Setters und SupportMethods
     public void setCD(CD _loadedCD) {
@@ -215,4 +220,8 @@ public class CDPlayer implements Device {
     public CDWechseler getCdWechseler() {
         return cdWechseler;
     }
+
+    public List<String> getFavoriteSongs() {
+        return favoriteSongs;
+    }
 }

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

@@ -491,6 +491,27 @@ class CDPlayerTest {
         );
     }
 
+    @ParameterizedTest
+    @MethodSource("addToFavoriteSongsData")
+    void addToFavoriteSongs(String testName,String cases, CDPlayer _cdPlayer,Exception exception) {
+        String myFavoriteSong=_cdPlayer.getCD().getPlayList()[0];
+        _cdPlayer.addToFavoriteSongs(myFavoriteSong);
+        assertThat(_cdPlayer.getFavoriteSongs().get(0)).describedAs(testName).isEqualTo(myFavoriteSong);
+
+    }
+    static Stream<Arguments> addToFavoriteSongsData () {
+        String[] audioPlayList = new String[]{"Audio 01", "Audio 02", "Audio 03", "Audio 04", "Audio 05"};
+        CD audioCD1 = new CD("Audio", "PopMusic", audioPlayList, "XAc20044");
+        CD audioCD2=new CD("Audio","RockMusic",audioPlayList,"BLXPP78");
 
+        CDPlayer cdPlayer1 = new CDPlayer();
+        cdPlayer1.changePlaySource();
+        cdPlayer1.loadCDWechseler(audioCD1, 0);
+        cdPlayer1.loadCDWechseler(audioCD2, 1);
+
+        return Stream.of(
+                Arguments.of("[addToFavoriteSongs() by addingOneSong] => favoriteSongsShouldReturnsThatAddedSong", "Case1", cdPlayer1, null)
+        );
+    }
 
     }