diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index 574d556..bf6ca8f 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -16,19 +16,6 @@ class UsbPlayerTest {
     UsbPlayer up = new UsbPlayer();
 
 
-    @Test
-    void louder_test() {
-        up.setLautstaerke(40);
-        up.louder();
-        assertThat(up.getLautstaerke()).isEqualTo(41);
-    }
-
-    @Test
-    void quieter_test() {
-        up.setLautstaerke(40);
-        up.quieter();
-        assertThat(up.getLautstaerke()).isEqualTo(39);
-    }
 /*
     @Test
     void getVolume() {
@@ -61,6 +48,7 @@ class UsbPlayerTest {
         assertThat(playState).describedAs(testName).isEqualTo(expectedResult);
     }
 
+
     static Stream<Arguments> PlayOptions() {
         UsbPlayer up1 = new UsbPlayer();
         UsbPlayer up8 = new UsbPlayer();
@@ -87,6 +75,24 @@ class UsbPlayerTest {
                 Arguments.of("No list of tracks : ", up3, "USB : connected,working,have no list."),
                 Arguments.of("connected , not working : ", up6, "USB : connected,not working."),
                 Arguments.of("not connected : ", up7, "not connected.")
+
+
+@ParameterizedTest
+@MethodSource("louderOptions")
+void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
+    int volumeNum = inputPlay.getLautstaerke();
+    assertThat(volumeNum).describedAs(testName).isEqualTo(expectedResult);
+}
+
+    static Stream<Arguments> louderOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.louder();
+        UsbPlayer up2 = new UsbPlayer();
+        up2.setLautstaerke(100);
+        up2.louder();
+        return Stream.of(
+                Arguments.of("Volume is : 1 ", up1, 1),
+                Arguments.of("Volume is : 100 ", up2, 100)
         );
     }
 }
\ No newline at end of file