UsbPlayerTest.quieter_10_Test Fifth Case

src/test/java/device/usbPlayer/UsbPlayerTest.java

@@ -227,30 +227,37 @@ class UsbPlayerTest {
 
     static Stream<Arguments> quieter_10_Options() {
         USB_Stick USBDrive = new USB_Stick();
+        //first case
         UsbPlayer up1 = new UsbPlayer(USBDrive);
         up1.setLautstaerke(10);
         up1.quieter_10();
-
+        //second case
         UsbPlayer up2 = new UsbPlayer(USBDrive);
         up2.setLautstaerke(50);
         for (int i = 0; i < 3; i++) {
             up2.quieter_10();
         }
-
+        //third case
         UsbPlayer up3 = new UsbPlayer(USBDrive);
         up3.quieter_10();
-
         //forth case
         UsbPlayer up4 = new UsbPlayer(USBDrive);
         up4.setLautstaerke(11);
         up4.mute();
         up4.quieter_10();
+        //fifth case
+        UsbPlayer up5 = new UsbPlayer(USBDrive);
+        up5.setLautstaerke(11);
+        up5.mute();
+        up5.unmute();
+        up5.quieter_10();
 
         return Stream.of(
                 Arguments.of("Volume was 10, should be 0 ", up1, 0),
                 Arguments.of("Volume was 50, should be 20 ", up2, 20),
                 Arguments.of("Volume was 0, should stay 0 ", up3, 0),
-                Arguments.of("Volume is muted,no change can be made ", up4, 0)
+                Arguments.of("Volume is muted,no change can be made ", up4, 0),
+                Arguments.of("Volume is unmuted,a change has been made ", up5, 1)
         );
     }