YoutubeMusicSearchExtractorTest can't be used with mocks

Requires further research

Author: XiangRongLin

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/search/YoutubeMusicSearchExtractorTest.java

@@ -17,6 +17,7 @@
 import static java.util.Collections.singletonList;
 import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 
+// Doesn't work with mocks. Makes request with different `dataToSend` i think
 public class YoutubeMusicSearchExtractorTest {
     public static class MusicSongs extends DefaultSearchExtractorTest {
         private static SearchExtractor extractor;