Method changeToNextCD of CDPlayer tested checking the effect2 -> loadedCDShouldNotHaveTheSameIdAsPrev.

src/main/java/device/cdPlayer/CD.java

@@ -4,6 +4,7 @@ public class CD {
     private String format;
     private String albumName;
     private String[] playList;
+    private String id;
 
     public CD() {}
 
@@ -16,6 +17,13 @@ public class CD {
         this.playList = playList;
     }
 
+    public CD(String format, String albumName, String[] playList, String id) {
+        this.format = format;
+        this.albumName = albumName;
+        this.playList = playList;
+        this.id = id;
+    }
+
     public String getFormat() {
         return format;
     }
@@ -39,4 +47,12 @@ public class CD {
     public void setAlbumName(String albumName) {
         this.albumName = albumName;
     }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
 }

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

@@ -152,7 +152,7 @@ public class CDPlayer implements Device {
             throw new MaxCapacityExceededException();
         }
         cdWechseler.loadOneCD(cd,index);
-        System.out.println(index);
+        this.loadedCD=cdWechseler.getCDList()[0];
     }
     public void changeToNextCD(){
         if(activeSource.equals("CDDrive")){

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

@@ -441,21 +441,40 @@ class CDPlayerTest {
             CD nextCD=_cdPlayer.getCD();
             assertThat(nextCD).describedAs(testName).isNotEqualTo(null);
         }
+        if(cases.equals("Case3")) {
+            CD actualCD=_cdPlayer.getCD();
+            System.out.println("loadedCD_id:"+actualCD.getId());
+            _cdPlayer.changeToNextCD();
+            CD nextCD=_cdPlayer.getCD();
+            System.out.println("nextCD_id:"+nextCD.getId());
+            /*System.out.println("loadedCD_id:"+_cdPlayer.getCD().getId());
+            System.out.println("actualCD_id:"+_cdPlayer.getCdWechseler().getCDList()[0].getId());
+            System.out.println("nextCD_id:"+_cdPlayer.getCdWechseler().getCDList()[1].getId());*/
+            //System.out.println("nextCD_id:"+nextCD.getId());
+            assertThat(nextCD.getId()==actualCD.getId()).describedAs(testName).isNotEqualTo(true);
+        }
     }
     static Stream<Arguments> changeToNextCDData () {
+        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();
 
         CDPlayer cdPlayer2 = new CDPlayer();
         cdPlayer2.changePlaySource();
-
-        String[] audioPlayList=new String[]{"Audio 01","Audio 02","Audio 03","Audio 04","Audio 05"};
-        CD audioCD1=new CD("Audio",audioPlayList);
         cdPlayer2.loadCDWechseler(audioCD1,0);
-        cdPlayer2.loadCDWechseler(audioCD1,1);
+        cdPlayer2.loadCDWechseler(audioCD2,1);
+
+        CDPlayer cdPlayer3 = new CDPlayer();
+        cdPlayer3.changePlaySource();
+        cdPlayer3.loadCDWechseler(audioCD1,0);
+        cdPlayer3.loadCDWechseler(audioCD2,1);
 
         return Stream.of(
                 Arguments.of("[changeToNextCD() by CDWechselerNotSelected ] => shouldThrowAnException", "Case1", cdPlayer1,new ChangeCDOnlyOnCDWechselerException()),
-                Arguments.of("[changeToNextCD()  checking the effect ] => loadedCDShouldNotReturnNull", "Case2", cdPlayer2,null)
+                Arguments.of("[changeToNextCD()  checking the effect ] => loadedCDShouldNotReturnNull", "Case2", cdPlayer2,null),
+                Arguments.of("[changeToNextCD()  checking the effect 2 ] => loadedCDShouldNotHaveTheSameIdAsPrev", "Case3", cdPlayer3,null)
         );
     }