diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index bf6ca8f..9671e73 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -5,6 +5,11 @@ import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
 import java.util.ArrayList;
 import java.util.stream.Stream;
 
@@ -16,6 +21,19 @@ 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() {
@@ -95,4 +113,5 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
                 Arguments.of("Volume is : 100 ", up2, 100)
         );
     }
+ */
 }
\ No newline at end of file