added second test case for chooseItem() & and added productive code for RadioPlayer

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

@@ -158,9 +158,14 @@ public class RadioPlayer implements Device {
 
     @Override
     public String chooseItem(int itemNr) {
+        if(itemNr > savedPlaylist.size()) {
+            playedStation = savedPlaylist.get(savedPlaylist.size()-1);
+            return ("Radio is playing station: 0" + savedPlaylist.size() + " " + this.playedStation + " from saved playlist");
+        }else{
             playedStation = savedPlaylist.get(itemNr - 1);
             return ("Radio is playing station: 0" + (savedPlaylist.indexOf(playedStation) + 1) + " " + this.playedStation + " from saved playlist");
         }
+    }
 
     @Override
     public String[] getItemList() {

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

@@ -183,9 +183,12 @@ class RadioPlayerTest {
     static Stream<Arguments> chooseItemOptions() {
         RadioPlayer rp = new RadioPlayer();
         rp.chooseItem(2);
+        RadioPlayer rp1 = new RadioPlayer();
+        rp1.chooseItem(5);
 
         return Stream.of(
-                Arguments.of("Test select station to play with nr isn`t bigger than playlist size", rp, "Teddy")
+                Arguments.of("Test select station in saved playlist to play with nr isn`t bigger than playlist size", rp, "Teddy"),
+                Arguments.of("Test select station in saved playlist to play with nr is bigger than playlist size. Last station in playlist gets played", rp1, "MegaHits")
         );
     }