diff --git a/src/main/java/device/cdPlayer/CDPlayer.java b/src/main/java/device/cdPlayer/CDPlayer.java
index f0b82a6..b7134fa 100644
--- a/src/main/java/device/cdPlayer/CDPlayer.java
+++ b/src/main/java/device/cdPlayer/CDPlayer.java
@@ -1,7 +1,7 @@
 package device.cdPlayer;
 
 import device.Device;
-
+import device.cdPlayer.exceptions.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -16,8 +16,6 @@ public class CDPlayer implements Device {
 
     private String actualPlayTrack="";
     private CD loadedCD;
-    private String[] cdAlbum=new String[]{};
-
 
     @Override
     public void louder() {
@@ -70,10 +68,23 @@ public class CDPlayer implements Device {
 
     @Override
     public String play() {
+        if(isCdFlapOpen()){
+            throw new CdFlapIsOpenException();
+        }
+        else if(!isCdFlapOpen()&&getCdDriveContent()==0){
+            throw new NoCDException();
+        }
+        else if(!isCdFlapOpen()&&getCdDriveContent()==1&&!checkFormat(loadedCD.getFormat())){
+            throw new FormatNotSupportedException();
+        }
+        else if(!isCdFlapOpen()&&getCdDriveContent()==1&&checkFormat(loadedCD.getFormat())){
+            System.out.println(loadedCD.getFormat()+" "+this.actualPlayTrack+" is playing.");
+            return "AllConditionsForPlayMet";
+        }
         return null;
     }
 
-    //Getters und Setters
+    //Getters, Setters und SupportMethods
     public void setCD(CD _loadedCD) {
         loadedCD=_loadedCD;
         this.setCdDriveContent();
@@ -84,4 +95,23 @@ public class CDPlayer implements Device {
         CdDriveContent = 1;
     }
 
+    public void tapOnCdFlap(){
+        this.CdFlap+=1;
+    }
+    private boolean checkFormat(String format){
+        if(this.supportedFormats.contains(format))
+            return true;
+        else return false;
+    }
+    private int getCdDriveContent() {
+        return CdDriveContent;
+    }
+    private boolean isCdFlapOpen() {
+        if(CdFlap==1) {
+            return true;
+        }
+        else
+            return false;
+    }
+
 }
diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index 87b63ab..65a2be0 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -2,9 +2,50 @@ package device.usbPlayer;
 
 import device.Device;
 
+import java.util.ArrayList;
+
 public class UsbPlayer implements Device {
 
-    private int Lautstaerke = 0;
+    private ArrayList<String> Playlist = new ArrayList<String>();
+    private String playTrack = "";
+    private Boolean isConnected;
+    private Boolean isDefect;
+    int Lautstaerke = 0;
+
+    //*********setters und getters********
+    public ArrayList<String> getPlaylist() {
+        return Playlist;
+    }
+
+    public void setPlaylist(ArrayList<String> playlist) {
+        Playlist = playlist;
+    }
+
+    public Boolean getDefect() {
+        return isDefect;
+    }
+
+    public void setDefect(Boolean defect) {
+        isDefect = defect;
+    }
+
+
+    public Boolean getConnected() {
+        return isConnected;
+    }
+
+    public void setConnected(Boolean connected) {
+        isConnected = connected;
+    }
+
+    public String getPlayTrack() {
+        return playTrack;
+    }
+
+    public void setPlayTrack(String playTrack) {
+        this.playTrack = playTrack;
+    }
+
 
     public void setLautstaerke(int ls) {
         if (ls <= 100) {
@@ -16,15 +57,35 @@ public class UsbPlayer implements Device {
         return Lautstaerke;
     }
 
-    @Override
-    public void louder() {
-        if(Lautstaerke < 100) {
-            Lautstaerke += 1;
-        } else {
-            Lautstaerke = 100;
+    //*********constructure********
+    public UsbPlayer() {
+        super();
+        isDefect = false;
+        isConnected = true;
+        Playlist.add("Musik 01.mp3");
+        Playlist.add("Musik 02.mp3");
+        Playlist.add("Musik 03.mp3");
+        playTrack = Playlist.get(0);
+
+    }
+    //**********search method*************
+    private boolean isAllAudio() {
+
+        String song = "";
+        boolean flag = true;
+
+        for (int i = 0; i < Playlist.size(); i++) {
+            song = Playlist.get(i).substring(Playlist.get(i).length() - 4);
+            if (song.equals(".mp3") | song.equals(".mp4") | song.equals(".wav")) {
+                flag = true;
+            } else {
+                flag = false;
+                break;
+            }
         }
+        return flag;
     }
-
+    //**********search method*************
     @Override
     public void quieter() {
         if(Lautstaerke > 0) {
@@ -34,6 +95,15 @@ public class UsbPlayer implements Device {
         }
     }
 
+    @Override
+    public void louder() {
+        if(Lautstaerke < 100) {
+            Lautstaerke += 1;
+        } else {
+            Lautstaerke = 100;
+        }
+    }
+
     @Override
     public int getVolume() {
         return 0;
@@ -67,7 +137,29 @@ public class UsbPlayer implements Device {
 
     @Override
     public String play() {
-        return null;
+        String result = "USB : ";
+        if (isConnected == true) {
+            result += "connected,";
+            if (isDefect == false) {
+                result += "working";
+                if (this.Playlist.size() != 0) {
+                    result += ",have a list";
+                    if (this.isAllAudio()) {
+                        result += ",Audio";
+                        if (!playTrack.equals(""))
+                            result += ",point to a track.";
+                        else
+                            result += ",doesn't point to a track.";
+                    } else {
+                        result += ",not Audio.";
+                    }
+                } else result += ",have no list.";
+            } else {
+                result += "not working.";
+            }
+        } else result = "not connected.";
+        return result;
+
     }
 
 }
diff --git a/src/test/java/device/cdPlayer/CDPlayerTest.java b/src/test/java/device/cdPlayer/CDPlayerTest.java
index 548d937..91ef68a 100644
--- a/src/test/java/device/cdPlayer/CDPlayerTest.java
+++ b/src/test/java/device/cdPlayer/CDPlayerTest.java
@@ -1,6 +1,6 @@
 package device.cdPlayer;
 
-import org.junit.jupiter.api.Test;
+import device.cdPlayer.exceptions.*;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
@@ -11,10 +11,115 @@ import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.*;
-
 @ExtendWith(MockitoExtension.class)
 class CDPlayerTest {
 
+    @ParameterizedTest
+    @MethodSource("playTestData")
+    void play(String testName, CDPlayer _cdPlayer,Exception exception , String expectedResult) {
+        if(exception!=null){
+            Exception newException=assertThrows(exception.getClass(),()->_cdPlayer.play());
+            assertEquals(expectedResult, newException.getMessage());
+        }else{
+            assertThat(_cdPlayer.play()).describedAs(testName).isEqualTo(expectedResult);
+        }
+    }
+    static Stream<Arguments> playTestData () {
+        //some PlayLists
+        String[] videoPlayList=new String[]{"Video 01","Video 02","Video 03","Video 04","Video 05"};
+        String[] audioPlayList=new String[]{"Audio 01","Audio 02","Audio 03","Audio 04","Audio 05"};
+        //some CDs
+        CD videoCD1=new CD("DVD",videoPlayList);
+        CD videoCD2=new CD("Blue-ray",videoPlayList);
+        CD audioCD1=new CD("Audio",audioPlayList);
+        CD audioCD2=new CD("MP3",audioPlayList);
+        CD audioCD3=new CD("WMA",audioPlayList);
+        CD audioCD4=new CD("AAC",audioPlayList);
+
+        //some CDPlayers
+        CDPlayer cdPlayer1=new CDPlayer();
+
+        CDPlayer cdPlayer2=new CDPlayer();
+        cdPlayer2.tapOnCdFlap();
+        cdPlayer2.tapOnCdFlap();
+
+        CDPlayer cdPlayer3=new CDPlayer();
+        cdPlayer3.tapOnCdFlap();
+
+        CDPlayer cdPlayer4=new CDPlayer();
+        cdPlayer4.tapOnCdFlap();
+        cdPlayer4.setCD(videoCD1);
+
+        //===================================
+        CDPlayer cdPlayer5=new CDPlayer();
+        cdPlayer5.tapOnCdFlap();
+        cdPlayer5.setCD(videoCD1);
+        cdPlayer5.tapOnCdFlap();
+
+        CDPlayer cdPlayer6=new CDPlayer();
+        cdPlayer6.tapOnCdFlap();
+        cdPlayer6.setCD(videoCD2);
+        cdPlayer6.tapOnCdFlap();
+        //===================================
+
+        CDPlayer cdPlayer7=new CDPlayer();
+        cdPlayer7.tapOnCdFlap();
+        cdPlayer7.setCD(audioCD1);
+        cdPlayer7.tapOnCdFlap();
+
+        CDPlayer cdPlayer8=new CDPlayer();
+        cdPlayer8.tapOnCdFlap();
+        cdPlayer8.setCD(audioCD2);
+        cdPlayer8.tapOnCdFlap();
+
+        CDPlayer cdPlayer9=new CDPlayer();
+        cdPlayer9.tapOnCdFlap();
+        cdPlayer9.setCD(audioCD3);
+        cdPlayer9.tapOnCdFlap();
+
+        CDPlayer cdPlayer10=new CDPlayer();
+        cdPlayer10.tapOnCdFlap();
+        cdPlayer10.setCD(audioCD4);
+        cdPlayer10.tapOnCdFlap();
+
+        return Stream.of(
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isEmpty] => NoCD", cdPlayer1, new NoCDException(), "CD must be set."),
+                Arguments.of("[CdFlap has been Opened and Closed, CdDriveContent=>isEmpty] => NoCD", cdPlayer2,new NoCDException(),"CD must be set."),
+                Arguments.of("[CdFlap=isOpen , CdDriveContent=>isEmpty] => CdFlapIsOpen", cdPlayer3,new CdFlapIsOpenException(),"Cd Flap must be closed."),
+                Arguments.of("[CdFlap=isOpen , CdDriveContent=>isSet] => CdFlapIsOpen", cdPlayer4,new CdFlapIsOpenException(),"Cd Flap must be closed."),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>DVD] => FormatNotSupported",cdPlayer5,new  FormatNotSupportedException(),"Cd-Format not supported."),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>Blue-ray] => FormatNotSupported",cdPlayer6, new  FormatNotSupportedException(),"Cd-Format not supported."),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>Audio] => AllConditionsForPlayMet", cdPlayer7,null,"AllConditionsForPlayMet"),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>MP3] => AllConditionsForPlayMet", cdPlayer8,null,"AllConditionsForPlayMet"),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>WMA] => AllConditionsForPlayMet", cdPlayer9,null,"AllConditionsForPlayMet"),
+                Arguments.of("[CdFlap=isClosed , CdDriveContent=>isSet, CdFormat=>AAC] => AllConditionsForPlayMet", cdPlayer10,null,"AllConditionsForPlayMet")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("louderTestData")
+    void louderTest(String testName,String testDirection, CDPlayer _cdPlayer,int anzClicks, int expectedResult) {
+        for (int i = 0; i < anzClicks; i++) {
+            _cdPlayer.louder();
+        }
+        if(testDirection.equals("VolumeIncreased")){
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isEqualTo(expectedResult);
+        }
+        if(testDirection.equals("VolumeHasChanged")){
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isNotEqualTo(expectedResult);
+        }if(testDirection.equals("VolumeNotDecreased")){
+            assertThat(_cdPlayer.getVolume()).describedAs(testName).isNotEqualTo(expectedResult);
+        }
+    }
+    static Stream<Arguments> louderTestData () {
+        CDPlayer cdPlayer=new CDPlayer();
+        return Stream.of(
+                Arguments.of("[getVolume() after 20x louder() ] => VolumeIncreased","VolumeIncreased", cdPlayer, 20, 20),
+                Arguments.of("[getVolume() after 2x louder() ] => VolumeHasChanged","VolumeHasChanged" ,cdPlayer,2,0),
+                Arguments.of("[getVolume() after 5x louder() ] => VolumeDecreased","VolumeNotDecreased", cdPlayer,5,-5)
+        );
+    }
+
     @ParameterizedTest
     @MethodSource("quieterTestData")
     void quieterTest(String testName,String testDirection, CDPlayer _cdPlayer,int anzClicks, int expectedResult) {
@@ -48,5 +153,4 @@ class CDPlayerTest {
         );
     }
 
-
 }
\ No newline at end of file
diff --git a/src/test/java/device/radioPlayer/RadioPlayerTest.java b/src/test/java/device/radioPlayer/RadioPlayerTest.java
index 1d0549f..3f2c716 100644
--- a/src/test/java/device/radioPlayer/RadioPlayerTest.java
+++ b/src/test/java/device/radioPlayer/RadioPlayerTest.java
@@ -2,7 +2,13 @@ package device.radioPlayer;
 
 
 import device.radioPlayer.RadioPlayer;
+import device.usbPlayer.UsbPlayer;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -38,27 +44,36 @@ class RadioPlayerTest {
         assertThat(rp.getLautstaerke()).isEqualTo(0);
     }
 /*
-
+    Jenkins config test
     @Test
     void getVolume() {
     }
 */
-    @Test
-    void next() {
-        rp.next();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
-    }
-
-
-    @Test
-    void prev() {
-        rp.prev();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
 
+    @ParameterizedTest
+    @MethodSource("prevNextOptions")
+    void prevNextTest(String testName, RadioPlayer testRp, String expectedResult) {
+        String station = testRp.playTrack;
+        assertThat(station).describedAs(testName).isEqualTo(expectedResult);
+}
+
+    static Stream<Arguments> prevNextOptions() {
+        RadioPlayer rp1 = new RadioPlayer();
+        RadioPlayer rp2 = new RadioPlayer();
+        RadioPlayer rp3 = new RadioPlayer();
+        rp1.next();
+        rp2.next();
+        rp2.prev();
+        rp3.prev();
+        return Stream.of(
+                Arguments.of("Next Station Test", rp1, "Radio Teddy"),
+                Arguments.of("Prev Station Test", rp2, "Radio YouFM"),
+                Arguments.of("Prev works on first Station ", rp3, "Radio MegaHits")
+        );
     }
+
 /*
+
     @Test
     void getInfoText() {
     }
diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index bf170fe..bd85948 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -1,55 +1,89 @@
 package device.usbPlayer;
 
-import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import java.util.stream.Stream;
+import java.util.ArrayList;
 
-import static org.junit.jupiter.api.Assertions.*;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class UsbPlayerTest {
 
     UsbPlayer up = new UsbPlayer();
 
-
-    @Test
-    void louder_test() {
-        up.setLautstaerke(40);
-        up.louder();
-        assertThat(up.getLautstaerke()).isEqualTo(41);
+    @ParameterizedTest
+    @MethodSource("PlayOptions")
+    void playTest(String testName, UsbPlayer inputPlay, String expectedResult) {
+        String playState = inputPlay.play();
+        assertThat(playState).describedAs(testName).isEqualTo(expectedResult);
     }
 
-    @Test
-    void quieter_test() {
-        up.setLautstaerke(40);
-        up.quieter();
-        assertThat(up.getLautstaerke()).isEqualTo(39);
-    }
-/*
-    @Test
-    void getVolume() {
-    }
+    static Stream<Arguments> PlayOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        UsbPlayer up8 = new UsbPlayer();
+        up8.setPlayTrack("");
+        UsbPlayer up2 = new UsbPlayer();
+        ArrayList<String> l = new ArrayList<String>();
+        l.add("a.mp3");
+        l.add("b.mp3");
+        l.add("c.gif");
+        up2.setPlaylist(l);
+        UsbPlayer up3 = new UsbPlayer();
+        ArrayList<String> Pl = new ArrayList<String>();
+        up3.setPlaylist(Pl);
+        UsbPlayer up6 = new UsbPlayer();
+        up6.setDefect(true);
+        UsbPlayer up7 = new UsbPlayer();
+        up7.setConnected(false);
 
-    @Test
-    void next() {
-    }
 
-    @Test
-    void prev() {
+        return Stream.of(
+                Arguments.of("All right : ", up1, "USB : connected,working,have a list,Audio,point to a track."),
+                Arguments.of("No first Track : ", up8, "USB : connected,working,have a list,Audio,doesn't point to a track."),
+                Arguments.of("No Audio Files : ", up2, "USB : connected,working,have a list,not Audio."),
+                Arguments.of("No list of tracks : ", up3, "USB : connected,working,have no list."),
+                Arguments.of("connected , not working : ", up6, "USB : connected,not working."),
+                Arguments.of("not connected : ", up7, "not connected."));
     }
 
-    @Test
-    void getInfoText() {
-    }
 
-    @Test
-    void getOptions() {
+@ParameterizedTest
+@MethodSource("louderOptions")
+void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
+    int volumeNum = inputPlay.getLautstaerke();
+    assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
+}
+
+    static Stream<Arguments> louderOptions() {
+        UsbPlayer up11 = new UsbPlayer();
+        up11.louder();
+        UsbPlayer up22 = new UsbPlayer();
+        up22.setLautstaerke(100);
+        up22.louder();
+        return Stream.of(
+                Arguments.of("Volume is : 1 ", up11, 1),
+                Arguments.of("Volume is : 100 ", up22, 100)
+        );
     }
 
-    @Test
-    void chooseOption() {
+    @ParameterizedTest
+    @MethodSource("quieterOptions")
+    void quieterTest(String testName, UsbPlayer inputPlay, int expectedResult) {
+        int volumeNum = inputPlay.getLautstaerke();
+        assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
     }
 
-    @Test
-    void play() {
+    static Stream<Arguments> quieterOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.quieter();
+        UsbPlayer up2 = new UsbPlayer();
+        up2.setLautstaerke(10);
+        up2.quieter();
+        return Stream.of(
+                Arguments.of("Volume must stay 0 ", up1, 0),
+                Arguments.of("Volume must be 9 ", up2, 9)
+        );
     }
- */
+
 }
\ No newline at end of file