UsbPlayerTest.muteTest third Case

src/main/java/device/usbPlayer/UsbPlayer.java

@@ -184,7 +184,7 @@ public class UsbPlayer implements Device {
 
     @Override
     public String mute() {
-
+        this.soundWas = getLautstaerke();
         setLautstaerke(0);
         return "muted";
     }

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

@@ -433,12 +433,14 @@ class UsbPlayerTest {
 
     @ParameterizedTest
     @MethodSource("muteOptions")
-    void muteTest(String testName, UsbPlayer inputUSB, String expectedResult,String testName2) {
-
+    void muteTest(String testName, UsbPlayer inputUSB, String expectedResult,String testName2,String testName3) {
+        int prevSound = inputUSB.getLautstaerke();
         String isMuted = inputUSB.mute();
         assertThat(isMuted).describedAs(testName).isEqualTo(expectedResult);
         //Second case
         assertThat(inputUSB.getLautstaerke()).describedAs(testName2).isEqualTo(0);
+        //third case
+        assertThat(inputUSB.soundWas).describedAs(testName3).isEqualTo(prevSound);
 
     }
 
@@ -451,7 +453,7 @@ class UsbPlayerTest {
 
 
         return Stream.of(
-                Arguments.of("The Sound is muted ", up1,"muted","Sound level is 0")
+                Arguments.of("The Sound is muted ", up1,"muted","Sound level is 0","previous sound level is saved ")
 
         );
     }