first Test for changeRegion()

src/main/java/device/radioPlayer/RadioPlayer.java

@@ -26,6 +26,9 @@ public class RadioPlayer implements Device {
         return Lautstaerke;
     }
 
+    public void changeRegion(){
+
+    }
 
     @Override
     public void louder() {

src/test/java/device/radioPlayer/RadioPlayerTest.java

@@ -44,35 +44,25 @@ class RadioPlayerTest {
         );
     }
 
-/*
-    @Test
-    void louder() {
-        rp.setLautstaerke(0);
-        rp.louder();
-        assertThat(rp.getLautstaerke()).isEqualTo(1);
+    @ParameterizedTest
+    @MethodSource("changeRegionOptions")
+    void changeFrequencyTest(String testName, RadioPlayer testRp, String expectedResult) {
+        String station = testRp.playTrack;
+        assertThat(station).describedAs(testName).isEqualTo(expectedResult);
     }
 
-    @Test
-    void louderMax() {
-        rp.setLautstaerke(100);
-        rp.louder();
-        assertThat(rp.getLautstaerke()).isEqualTo(100);
-    }
+    static Stream<Arguments> changeRegionOptions() {
+        RadioPlayer rp1 = new RadioPlayer();
+        rp1.changeRegion();
 
-    @Test
-    void quieter() {
-        rp.setLautstaerke(1);
-        rp.quieter();
-        assertThat(rp.getLautstaerke()).isEqualTo(0);
-    }
-    @Test
-    void quieterMax() {
-        rp.setLautstaerke(0);
-        rp.quieter();
-        assertThat(rp.getLautstaerke()).isEqualTo(0);
+        return Stream.of(
+                Arguments.of("Test change Region to Bayern", rp1, "Antenne Bayern")
+
+        );
     }
 
-    Jenkins config test
+
+/*
     @Test
     void getVolume() {
     }