added fourth test case for getInfoText() & and added productive code for RadioPlayer

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

@@ -151,7 +151,7 @@ public class RadioPlayer implements Device {
     public String getInfoText() {
         String infoText = playedStation;
         if(regionPlaylist.contains(playedStation)) return ("Regional playlist " + infoText);
-        else return infoText;
+        else return ("Saved playlist " + infoText);
     }
 
     @Override

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

@@ -382,6 +382,7 @@ class RadioPlayerTest {
         if(testTyp.equals("null")) bool = Strings.isNullOrEmpty(testRp.getInfoText());
         else if(testTyp.contains("station")) bool = testRp.getInfoText().contains(testRp.playedStation);
         else if(testTyp.contains("region")) bool = testRp.getInfoText().contains("Regional playlist");
+        else if(testTyp.contains("saved")) bool = testRp.getInfoText().contains("Saved playlist");
 
         assertThat(bool).describedAs(testName).isEqualTo(expectedResult);
     }
@@ -391,11 +392,13 @@ class RadioPlayerTest {
         RadioPlayer rp1 = new RadioPlayer();
         RadioPlayer rp2 = new RadioPlayer();
         rp2.changeRegion("BY");
+        RadioPlayer rp3 = new RadioPlayer();
 
         return Stream.of(
                 Arguments.of("Test for getInfoText is not empty or null", "null", rp, false),
                 Arguments.of("Test for getInfoText contains played station", "station", rp1, true),
-                Arguments.of("Test for getInfoText contains regional playlist if played station is in it", "region", rp2, true)
+                Arguments.of("Test for getInfoText contains regional playlist if played station is in it", "region", rp2, true),
+                Arguments.of("Test for getInfoText contains saved playlist if played station is in it", "saved", rp3, true)
         );
     }
 }