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

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

@@ -149,6 +149,7 @@ public class RadioPlayer implements Device {
 
     @Override
     public String getInfoText() {
+        if(showStationInfo().equals("")) return buildInfoText();
         return (buildInfoText() + "\n Now playing: " + showStationInfo());
     }
 

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

@@ -378,7 +378,7 @@ class RadioPlayerTest {
     @ParameterizedTest
     @MethodSource("getInfoTextOptions")
     void testGetInfoText(String testName, String testTyp, RadioPlayer testRp, boolean expectedResult) {
-        Boolean bool = null;
+        Boolean bool;
         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");
@@ -386,6 +386,7 @@ class RadioPlayerTest {
         else if(testTyp.contains("savedNum")) bool = testRp.getInfoText().contains(("0") + testRp.savedPlaylist.indexOf(testRp.playedStation) + 1);
         else if(testTyp.contains("regionNum")) bool = testRp.getInfoText().contains(("0") + testRp.regionPlaylist.indexOf(testRp.playedStation) + 1);
         else if(testTyp.contains("stationInfo")) bool = testRp.getInfoText().contains("Now playing");
+        else bool = testRp.getInfoText().contains("Now playing");
 
         assertThat(bool).describedAs(testName).isEqualTo(expectedResult);
     }
@@ -403,6 +404,8 @@ class RadioPlayerTest {
         rp5.next();
         RadioPlayer rp6 = new RadioPlayer();
         rp6.changeRegion("BY");
+        RadioPlayer rp7 = new RadioPlayer();
+        rp7.next();
 
         return Stream.of(
                 Arguments.of("Test for getInfoText is not empty or null", "null", rp, false),
@@ -411,7 +414,8 @@ class RadioPlayerTest {
                 Arguments.of("Test for getInfoText contains saved playlist if played station is in it", "saved", rp3, true),
                 Arguments.of("Test for getInfoText contains station number in saved playlist", "savedNum", rp4, true),
                 Arguments.of("Test for getInfoText contains station number in regional playlist", "regionNum", rp5, true),
-                Arguments.of("Test for getInfoText contains station info if station has one", "stationInfo", rp6, true)
+                Arguments.of("Test for getInfoText contains station info if station has one", "stationInfo", rp6, true),
+                Arguments.of("Test for getInfoText not contains station info if station not has one", "noStationInfo", rp7, false)
         );
     }
 }