revised Test for prev and next and updated functions

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

@@ -2,7 +2,13 @@ package device.radioPlayer;
 
 
 import device.radioPlayer.RadioPlayer;
+import device.usbPlayer.UsbPlayer;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -43,22 +49,30 @@ class RadioPlayerTest {
     void getVolume() {
     }
 */
-    @Test
-    void next() {
-        rp.next();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
+    @ParameterizedTest
+    @MethodSource("prevNextOptions")
+    void prevNextTest(String testName, RadioPlayer testRp, String expectedResult) {
+        String station = testRp.playTrack;
+        assertThat(station).describedAs(testName).isEqualTo(expectedResult);
+}
+
+    static Stream<Arguments> prevNextOptions() {
+        RadioPlayer rp1 = new RadioPlayer();
+        RadioPlayer rp2 = new RadioPlayer();
+        RadioPlayer rp3 = new RadioPlayer();
+        rp1.next();
+        rp2.next();
+        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")
+        );
     }
 
-
-    @Test
-    void prev() {
-        rp.prev();
-        int currentIndex=rp.Playlist.indexOf(rp.playTrack);
-        assertThat(rp.playTrack).isEqualTo(rp.Playlist.get((currentIndex)%rp.Playlist.size()));
-
-    }
 /*
+
     @Test
     void getInfoText() {
     }