diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index fc121f7..8999478 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -252,25 +252,34 @@ class UsbPlayerTest {
     }
 
     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
+        //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(Pl);
+        //Flac
+        UsbPlayer up4 = new UsbPlayer();
+        ArrayList<String> Pl2 = new ArrayList<String>();
+        Pl2.add("Musik 01.flac");
+        Pl2.add("Musik 02.flac");
+        Pl2.add("Musik 03.flac");
+        up4.setPlaylist(Pl);
         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 .m4a ", up3.isAllAudio(), true),
+                Arguments.of("Check if the Files are .flac ", up4.isAllAudio(), true)
 
         );
     }