UsbPlayerTest.quieter_10_Test first Case

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

@@ -111,6 +111,10 @@ public class UsbPlayer implements Device {
         }
     }
 
+    public void quieter_10(){
+        Lautstaerke -= 10;
+    }
+
     @Override
     public int getVolume() {
         return 0;

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

@@ -136,28 +136,21 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
         );
     }
 
+
     @ParameterizedTest
-    @MethodSource("louder_10_Options")
-    void louder_10_Test(String testName, UsbPlayer inputPlay, int expectedResult) {
+    @MethodSource("quieter_10_Options")
+    void quieter_10_Test(String testName, UsbPlayer inputPlay, int expectedResult) {
         int volumeNum = inputPlay.getLautstaerke();
         assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
     }
 
-    static Stream<Arguments> louder_10_Options() {
+    static Stream<Arguments> quieter_10_Options() {
         UsbPlayer up1 = new UsbPlayer();
-        up1.Louder_10();
-        UsbPlayer up2 = new UsbPlayer();
-        for (int i = 0; i < 3; i++) {//3
-            up2.Louder_10();
-        }
-        UsbPlayer up3 = new UsbPlayer();
-        up3.setLautstaerke(100);
-        up3.Louder_10();
+        up1.setLautstaerke(10);
+        up1.quieter_10();
 
         return Stream.of(
-                Arguments.of("Volume was 0, should 10 ", up1, 10),
-                Arguments.of("Volume was increased 3 times :30 ", up2, 30),
-                Arguments.of("Volume is 100 and doesn't change ", up3, 100)
+                Arguments.of("Volume was 10, should be 0 ", up1, 0)
         );
     }