update the set of the Lautstaerke in the UsbPlayer class

src/main/java/device/UsbPlayer.java

@@ -5,12 +5,14 @@ public class UsbPlayer implements Device{
     private int Lautstaerke = 0;
 
     public void setLautstaerke(int ls) {
-        if(Lautstaerke < 100) {
-        Lautstaerke += 1;
-    } else {
-        Lautstaerke = 100;
-    }		}
-    public int getLautstaerke(){return Lautstaerke;}
+        if (ls <= 100) {
+            Lautstaerke = ls;
+        }
+    }
+
+    public int getLautstaerke() {
+        return Lautstaerke;
+    }
 
     @Override
     public void louder() {

src/test/java/device/UsbPlayerTest.java

@@ -8,11 +8,12 @@ class UsbPlayerTest {
 
     UsbPlayer up =new UsbPlayer();
 
-/*
+
     @Test
     void louder() {
+       up.setLautstaerke(1);
     }
-
+/*
     @Test
     void quiter() {
     }