added test and code for second region to changeRegion()

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

@@ -27,13 +27,31 @@ public class RadioPlayer implements Device {
         return Lautstaerke;
     }
 
-    public void changeRegion(){
+    public void changeRegion(String region){
+        switch (region) {
+            case "Bayern":
                 Playlist.clear();
                 Playlist.add("Antenne Bayern");
                 Playlist.add("Bayern 1");
                 Playlist.add("Bayern 3");
                 Playlist.add("Hit Radio N1");
                 playTrack=Playlist.get(0);
+                break;
+            case "Hessen":
+                Playlist.clear();
+                Playlist.add("Hit Radio FFH");
+                Playlist.add("HR 1");
+                Playlist.add("HR 3");
+                Playlist.add("You FM");
+                playTrack=Playlist.get(0);
+                break;
+            default:
+                Playlist.clear();
+                Playlist.add("YouFM");
+                Playlist.add("Teddy");
+                Playlist.add("MegaHits");
+                playTrack=Playlist.get(0);
+        }
     }
 
     @Override

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

@@ -46,18 +46,20 @@ class RadioPlayerTest {
 
     @ParameterizedTest
     @MethodSource("changeRegionOptions")
-    void changeFrequencyTest(String testName, RadioPlayer testRp, String expectedResult) {
+    void changeRegionTest(String testName, RadioPlayer testRp, String expectedResult) {
         String station = testRp.playTrack;
         assertThat(station).describedAs(testName).isEqualTo(expectedResult);
     }
 
     static Stream<Arguments> changeRegionOptions() {
         RadioPlayer rp1 = new RadioPlayer();
-        rp1.changeRegion();
+        RadioPlayer rp2 = new RadioPlayer();
+        rp1.changeRegion("Bayern");
+        rp2.changeRegion("Hessen");
 
         return Stream.of(
-                Arguments.of("Test change Region to Bayern", rp1, "Antenne Bayern")
-
+                Arguments.of("Test change Region to Bayern", rp1, "Antenne Bayern"),
+                Arguments.of("Test change Region to Hessen", rp2, "Hit Radio FFH")
         );
     }
 
@@ -84,9 +86,9 @@ class RadioPlayerTest {
         rp2.prev();
         rp3.prev();
         return Stream.of(
-                Arguments.of("Next Station Test", rp1, "Radio Teddy"),
-                Arguments.of("Prev Station Test", rp2, "Radio YouFM"),
-                Arguments.of("Prev works on first Station ", rp3, "Radio MegaHits")
+                Arguments.of("Next Station Test", rp1, "Teddy"),
+                Arguments.of("Prev Station Test", rp2, "YouFM"),
+                Arguments.of("Prev works on first Station ", rp3, "MegaHits")
         );
     }