Test+Productive code for case:3 of method-test next created.

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

@@ -44,9 +44,10 @@ public class CDPlayer implements Device {
     public void next() {
         List<String> playList =  Arrays.asList(loadedCD.getPlayList());
         int indexOfActualPlayTrack=playList.indexOf(actualPlayTrack);
-        System.out.println("indexOfActualPlayTrack="+indexOfActualPlayTrack);
-        this.actualPlayTrack=playList.get(indexOfActualPlayTrack +1);
-        System.out.println("nextSong= "+actualPlayTrack);
+        int indexOfNextPlayTrack=(indexOfActualPlayTrack+1)%loadedCD.getPlayList().length;
+        //System.out.println("actualIndex= "+indexOfActualPlayTrack);
+        this.actualPlayTrack=playList.get(indexOfNextPlayTrack );
+        //System.out.println("nextSong= "+actualPlayTrack);
     }
 
     @Override
@@ -66,7 +67,7 @@ public class CDPlayer implements Device {
 
     @Override
     public String[] getItemList() {
-        return new String[0];
+        return loadedCD.getPlayList();
     }
 
 

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

@@ -156,27 +156,44 @@ class CDPlayerTest {
     @ParameterizedTest
     @MethodSource("nextTestData")
     void nextTest(String testName,String testDirection, CDPlayer _cdPlayer,int anzClicks, String expectedResult){
-        for (int i = 0; i < anzClicks; i++) {
-            _cdPlayer.next();
+
+        if(testDirection.equals("SecondSongSelected")|| testDirection.equals("ThirdSongSelected")){
+            for (int i = 0; i < anzClicks; i++) {
+                _cdPlayer.next();
+            }
+            assertThat(_cdPlayer.getActualPlayTrack()).describedAs(testName).isEqualTo(expectedResult);
         }
-        //if(testDirection.equals("SecondSongSelected")){
+        if(testDirection.equals("FirstSongSelected")){
+            for (int i = 0; i <anzClicks; i++) {
+                _cdPlayer.next();
+            }
             assertThat(_cdPlayer.getActualPlayTrack()).describedAs(testName).isEqualTo(expectedResult);
-        //}
+        }
     }
     static Stream<Arguments> nextTestData () {
 
         String[] audioPlayList=new String[]{"Audio 01","Audio 02","Audio 03","Audio 04","Audio 05"};
         CD audioCD=new CD("Audio",audioPlayList);
 
-        CDPlayer cdPlayer=new CDPlayer();
-        cdPlayer.tapOnCdFlap();
-        cdPlayer.setCD(audioCD);
-        cdPlayer.tapOnCdFlap();
-        System.out.println(cdPlayer.getActualPlayTrack());
+        CDPlayer cdPlayer1=new CDPlayer();
+        cdPlayer1.tapOnCdFlap();
+        cdPlayer1.setCD(audioCD);
+        cdPlayer1.tapOnCdFlap();
+
+        CDPlayer cdPlayer2=new CDPlayer();
+        cdPlayer2.tapOnCdFlap();
+        cdPlayer2.setCD(audioCD);
+        cdPlayer2.tapOnCdFlap();
+
+        CDPlayer cdPlayer3=new CDPlayer();
+        cdPlayer3.tapOnCdFlap();
+        cdPlayer3.setCD(audioCD);
+        cdPlayer3.tapOnCdFlap();
 
         return Stream.of(
-                Arguments.of("[getActualPlayTrack() after 1x next() starting by firstSong] => SecondSongSelected","SecondSongSelected", cdPlayer, 1, cdPlayer.getSongByNumber(1)),
-                Arguments.of("[getActualPlayTrack() after 2x next() starting by firstSong] => ThirdSongSelected","ThirdSongSelected" ,cdPlayer,1,cdPlayer.getSongByNumber(2))
+                Arguments.of("[getActualPlayTrack() after 1x next() starting by firstSong] => SecondSongSelected","SecondSongSelected", cdPlayer1, 1, cdPlayer1.getSongByNumber(1)),
+                Arguments.of("[getActualPlayTrack() after 2x next() starting by firstSong] => ThirdSongSelected","ThirdSongSelected" ,cdPlayer2,2,cdPlayer2.getSongByNumber(2)),
+                Arguments.of("[getActualPlayTrack() after 1x next() starting by lastSong] => FirstSongSelected","FirstSongSelected", cdPlayer3,cdPlayer3.getItemList().length,cdPlayer3.getSongByNumber(0))
         );
     }