Merge commit '7d66b2e47ad5a005bc446384abc2cd5aaae5e21b' into HEAD

src/main/java/device/usbPlayer/UsbPlayer.java

@@ -111,7 +111,9 @@ public class UsbPlayer implements Device {
 
     @Override
     public void next() {
-
+        int currentIdex = Playlist.indexOf(playTrack);
+        int nextIndex = (currentIdex + 1) % Playlist.size();
+        playTrack = Playlist.get(nextIndex);
     }
 
     @Override

src/test/java/device/usbPlayer/UsbPlayerTest.java

@@ -86,4 +86,32 @@ void louderTest(String testName, UsbPlayer inputPlay, int expectedResult) {
         );
     }
 
+
+    @ParameterizedTest
+    @MethodSource("NextOptions")
+    void NextTest(String testName, UsbPlayer inputPlay, String expectedResult) {
+        String current_Track = inputPlay.getPlayTrack();
+        assertThat(current_Track).describedAs(testName).isEqualTo(expectedResult);
+    }
+
+    static Stream<Arguments> NextOptions() {
+        UsbPlayer up1 = new UsbPlayer();
+        up1.next();
+        UsbPlayer up2 = new UsbPlayer();
+        for (int i = 1; i < up2.getPlaylist().size(); i++) {
+            up2.next();
+        }
+        UsbPlayer up3 = new UsbPlayer();
+        for (int i = 1; i < up3.getPlaylist().size(); i++) {
+            up3.next();
+        }
+        up3.next();
+        return Stream.of(
+                Arguments.of("Second-Song : Musik 02.mp3 ", up1, "Musik 02.mp3"),
+                Arguments.of("Last-Song : Musik 03.mp3  ", up2, "Musik 03.mp3"),
+                Arguments.of("From last to first Song : Musik 01.mp3  ", up3, "Musik 01.mp3")
+
+        );
+    }
+
 }