Add tabs and tags methods in tests interfaces and annotate all methods with the Test JUnit annotation

These changes should help to detect tests as tests, when running a subset of
tests or all tests.
They should be also implemented in these interfaces' implementations (new and
existing ones).

Co-authored-by: ThetaDev <t.testboy@gmail.com>

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseChannelExtractorTest.java

@@ -1,11 +1,22 @@
 package org.schabi.newpipe.extractor.services;
 
-@SuppressWarnings("unused")
+import org.junit.jupiter.api.Test;
-public interface BaseChannelExtractorTest extends BaseListExtractorTest {
+
+public interface BaseChannelExtractorTest extends BaseExtractorTest {
+    @Test
     void testDescription() throws Exception;
+    @Test
     void testAvatarUrl() throws Exception;
+    @Test
     void testBannerUrl() throws Exception;
+    @Test
     void testFeedUrl() throws Exception;
+    @Test
     void testSubscriberCount() throws Exception;
+    @Test
     void testVerified() throws Exception;
+    @Test
+    void testTabs() throws Exception;
+    @Test
+    void testTags() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseExtractorTest.java

@@ -1,10 +1,16 @@
 package org.schabi.newpipe.extractor.services;
 
-@SuppressWarnings("unused")
+import org.junit.jupiter.api.Test;
+
 public interface BaseExtractorTest {
+    @Test
     void testServiceId() throws Exception;
+    @Test
     void testName() throws Exception;
+    @Test
     void testId() throws Exception;
+    @Test
     void testUrl() throws Exception;
+    @Test
     void testOriginalUrl() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseListExtractorTest.java

@@ -1,7 +1,10 @@
 package org.schabi.newpipe.extractor.services;
 
-@SuppressWarnings("unused")
+import org.junit.jupiter.api.Test;
+
 public interface BaseListExtractorTest extends BaseExtractorTest {
+    @Test
     void testRelatedItems() throws Exception;
+    @Test
     void testMoreRelatedItems() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BasePlaylistExtractorTest.java

@@ -1,11 +1,18 @@
 package org.schabi.newpipe.extractor.services;
 
-@SuppressWarnings("unused")
+import org.junit.jupiter.api.Test;
+
 public interface BasePlaylistExtractorTest extends BaseListExtractorTest {
+    @Test
     void testThumbnailUrl() throws Exception;
+    @Test
     void testBannerUrl() throws Exception;
+    @Test
     void testUploaderName() throws Exception;
+    @Test
     void testUploaderAvatarUrl() throws Exception;
+    @Test
     void testStreamCount() throws Exception;
+    @Test
     void testUploaderVerified() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseSearchExtractorTest.java

@@ -1,8 +1,12 @@
 package org.schabi.newpipe.extractor.services;
 
-@SuppressWarnings("unused")
+import org.junit.jupiter.api.Test;
+
 public interface BaseSearchExtractorTest extends BaseListExtractorTest {
+    @Test
     void testSearchString() throws Exception;
+    @Test
     void testSearchSuggestion() throws Exception;
+    @Test
     void testSearchCorrected() throws Exception;
 }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseStreamExtractorTest.java

@@ -1,36 +1,70 @@
 package org.schabi.newpipe.extractor.services;
 
+import org.junit.jupiter.api.Test;
+
 public interface BaseStreamExtractorTest extends BaseExtractorTest {
+    @Test
     void testStreamType() throws Exception;
+    @Test
     void testUploaderName() throws Exception;
+    @Test
     void testUploaderUrl() throws Exception;
+    @Test
     void testUploaderAvatarUrl() throws Exception;
+    @Test
     void testSubscriberCount() throws Exception;
+    @Test
     void testSubChannelName() throws Exception;
+    @Test
     void testSubChannelUrl() throws Exception;
+    @Test
     void testSubChannelAvatarUrl() throws Exception;
+    @Test
     void testThumbnailUrl() throws Exception;
+    @Test
     void testDescription() throws Exception;
+    @Test
     void testLength() throws Exception;
+    @Test
     void testTimestamp() throws Exception;
+    @Test
     void testViewCount() throws Exception;
+    @Test
     void testUploadDate() throws Exception;
+    @Test
     void testTextualUploadDate() throws Exception;
+    @Test
     void testLikeCount() throws Exception;
+    @Test
     void testDislikeCount() throws Exception;
+    @Test
     void testRelatedItems() throws Exception;
+    @Test
     void testAgeLimit() throws Exception;
+    @Test
     void testErrorMessage() throws Exception;
+    @Test
     void testAudioStreams() throws Exception;
+    @Test
     void testVideoStreams() throws Exception;
+    @Test
     void testSubtitles() throws Exception;
+    @Test
     void testGetDashMpdUrl() throws Exception;
+    @Test
     void testFrames() throws Exception;
+    @Test
     void testHost() throws Exception;
+    @Test
     void testPrivacy() throws Exception;
+    @Test
     void testCategory() throws Exception;
+    @Test
     void testLicence() throws Exception;
+    @Test
     void testLanguageInfo() throws Exception;
+    @Test
     void testTags() throws Exception;
+    @Test
     void testSupportInfo() throws Exception;
 }