diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index 8e38ed0..1f395c8 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -69,14 +69,14 @@ public class UsbPlayer implements Device {
 
     }
     //**********search method*************
-    private boolean isAllAudio() {
+    public 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")) {
+            if (song.equals(".mp3") | song.equals(".mp4")| song.equals(".m4a")| song.equals(".wav")| song.equals(".wma")| song.equals(".aac") ) {
                 flag = true;
             } else {
                 flag = false;
@@ -211,4 +211,12 @@ public class UsbPlayer implements Device {
         return false;
     }
 
+    public void GoToFirst() {
+        //go to the first song in the list
+        setPlayTrack(getPlaylist().get(0));
+    }
+
+    public void GoToLast() {
+        setPlayTrack("Musik 03.mp3");
+    }
 }
diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index 2a613fb..042a4a9 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -3,6 +3,7 @@ package device.usbPlayer;
 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;
 
@@ -48,12 +49,12 @@ class UsbPlayerTest {
     }
 
 
-@ParameterizedTest
-@MethodSource("louderOptions")
-void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
-    int volumeNum = inputPlay.getLautstaerke();
-    assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
-}
+    @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();
@@ -149,7 +150,7 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
 
         UsbPlayer up2 = new UsbPlayer();
         for (int i = 0; i <= 3; i++) {
-          up2.Louder_10();
+            up2.Louder_10();
         }
         up2.quieter_10();
 
@@ -162,6 +163,7 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
                 Arguments.of("Volume was 100, should stay 100 ", up3, 100)
         );
     }
+
     @ParameterizedTest
     @MethodSource("quieter_10_Options")
     void quieter_10_Test(String testName, UsbPlayer inputPlay, int expectedResult) {
@@ -194,10 +196,10 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
     @MethodSource("FindSongOptions")
     void findSongTest(String testName, int inputPlay, int expectedResult) {
         //first case: the song is not in the Album
-       // int songLoc1 = inputPlay.findSong("song 4");
+        // int songLoc1 = inputPlay.findSong("song 4");
         assertThat(inputPlay).describedAs(testName).isEqualTo(expectedResult);
         //Second Case: the song is in the album
-       // int songLoc2 = inputPlay.findSong("Musik 02");
+        // int songLoc2 = inputPlay.findSong("Musik 02");
         assertThat(inputPlay).describedAs(testName).isEqualTo(expectedResult);
 
     }
@@ -242,5 +244,114 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
         );
     }
 
+    @ParameterizedTest
+    @MethodSource("isAllAudioOptions")
+    void isAllAudioTest(String testName, boolean inputTestResult, boolean expectedResult) {
+        // String current_Track = inputPlay.getPlayTrack();
+        assertThat(inputTestResult).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> isAllAudioOptions() {
+        //mp3
+        UsbPlayer up1 = new UsbPlayer();
+        //mp4
+        UsbPlayer up2 = new UsbPlayer();
+        ArrayList<String> Pl = new ArrayList<String>();
+        Pl.add("Musik 01.mp4");
+        Pl.add("Musik 02.mp4");
+        Pl.add("Musik 03.mp4");
+        up2.setPlaylist(Pl);
+        //m4a
+        UsbPlayer up3 = new UsbPlayer();
+        ArrayList<String> Pl1 = new ArrayList<String>();
+        Pl1.add("Musik 01.m4a");
+        Pl1.add("Musik 02.m4a");
+        Pl1.add("Musik 03.m4a");
+        up3.setPlaylist(Pl1);
+        //wav
+        UsbPlayer up4 = new UsbPlayer();
+        ArrayList<String> Pl2 = new ArrayList<String>();
+        Pl2.add("Musik 01.wav");
+        Pl2.add("Musik 02.wav");
+        Pl2.add("Musik 03.wav");
+        up4.setPlaylist(Pl2);
+        //wma
+        UsbPlayer up5 = new UsbPlayer();
+        ArrayList<String> Pl3 = new ArrayList<String>();
+        Pl3.add("Musik 01.wma");
+        Pl3.add("Musik 02.wma");
+        Pl3.add("Musik 03.wma");
+        up5.setPlaylist(Pl3);
+        //aac
+        UsbPlayer up6 = new UsbPlayer();
+        ArrayList<String> Pl4 = new ArrayList<String>();
+        Pl4.add("Musik 01.aac");
+        Pl4.add("Musik 02.aac");
+        Pl4.add("Musik 03.aac");
+        up6.setPlaylist(Pl4);
+        //mixed Audio and text Files in the Album
+        UsbPlayer up7 = new UsbPlayer();
+        ArrayList<String> Pl5 = new ArrayList<String>();
+        Pl5.add("Musik 01.aac");
+        Pl5.add("Musik 02.txt");
+        Pl5.add("Musik 03.aac");
+        up7.setPlaylist(Pl5);
+
+        return Stream.of(
+                Arguments.of("Check if the Files are .mp3 ", up1.isAllAudio(), true),
+                Arguments.of("Check if the Files are .mp4 ", up2.isAllAudio(), true),
+                Arguments.of("Check if the Files are .m4a ", up3.isAllAudio(), true),
+                Arguments.of("Check if the Files are .wav ", up4.isAllAudio(), true),
+                Arguments.of("Check if the Files are .wma ", up5.isAllAudio(), true),
+                Arguments.of("Check if the Files are .aac ", up6.isAllAudio(), true),
+                Arguments.of("Check case of mixed Files", up7.isAllAudio(), false)
+
+        );
+    }
+
+    //GoToFirst()
+    @ParameterizedTest
+    @MethodSource("GoToFirstOptions")
+    void GoToFirstTest(String testName, UsbPlayer inputUSB, String expectedResult) {
+        String firstSong = inputUSB.getPlayTrack();
+        assertThat(firstSong ).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> GoToFirstOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.GoToFirst();
+
+        UsbPlayer up2 = new UsbPlayer();
+        up2.GoToFirst();
+        up2.GoToFirst();
+
+        UsbPlayer up3 = new UsbPlayer();
+        up3.next();
+        up3.GoToFirst();
+
+        return Stream.of(
+                Arguments.of("It should go to the first Song ", up1,up1.getPlaylist().get(0)),
+                Arguments.of("Call the function twice and it stills go to the first Song ", up2,up2.getPlaylist().get(0)),
+                Arguments.of("go to the next Song then back to first Song ", up3,up3.getPlaylist().get(0))
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("GoToLastOptions")
+    void GoToLastTest(String testName, UsbPlayer inputUSB, String expectedResult) {
+        String firstSong = inputUSB.getPlayTrack();
+        assertThat(firstSong ).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> GoToLastOptions() {
+        //first case
+        UsbPlayer up1 = new UsbPlayer();
+        up1.GoToLast();
+
+
+        return Stream.of(
+                Arguments.of("It should go to the first Song ", up1,"Musik 03.mp3")
+        );
+    }
 
 }
\ No newline at end of file