[YouTube] Add test for interactiveTabbedHeaderRenderer channel header

This test uses the Minecraft game topic channel.

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeChannelExtractorTest.java

@@ -7,6 +7,7 @@ import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.schabi.newpipe.extractor.ExtractorAsserts.assertContains;
 import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertNotBlank;
 import static org.schabi.newpipe.extractor.ExtractorAsserts.assertTabsContain;
 import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestGetPageInNewExtractor;
@@ -710,8 +711,10 @@ public class YoutubeChannelExtractorTest {
         // ChannelExtractor
         //////////////////////////////////////////////////////////////////////////*/
 
+        @Test
         @Override
         public void testDescription() throws ParsingException {
+            assertNotBlank(extractor.getDescription());
         }
 
         @Test
@@ -885,4 +888,109 @@ public class YoutubeChannelExtractorTest {
             assertTrue(extractor.getTags().isEmpty());
         }
     }
+
+    static class InteractiveTabbedHeader implements BaseChannelExtractorTest {
+
+        private static ChannelExtractor extractor;
+
+        @BeforeAll
+        static void setUp() throws Exception {
+            YoutubeTestsUtils.ensureStateless();
+            NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "interactiveTabbedHeader"));
+            extractor = YouTube.getChannelExtractor(
+                    "https://www.youtube.com/channel/UCQvWX73GQygcwXOTSf_VDVg");
+            extractor.fetchPage();
+        }
+
+        @Test
+        @Override
+        public void testDescription() throws Exception {
+            final String description = extractor.getDescription();
+            assertContains("Minecraft", description);
+            assertContains("game", description);
+            assertContains("Mojang", description);
+        }
+
+        @Test
+        @Override
+        public void testAvatarUrl() throws Exception {
+            final String avatarUrl = extractor.getAvatarUrl();
+            assertIsSecureUrl(avatarUrl);
+            assertContains("yt3", avatarUrl);
+        }
+
+        @Test
+        @Override
+        public void testBannerUrl() throws Exception {
+            final String bannerUrl = extractor.getBannerUrl();
+            assertIsSecureUrl(bannerUrl);
+            assertContains("yt3", bannerUrl);
+        }
+
+        @Test
+        @Override
+        public void testFeedUrl() throws Exception {
+            assertEquals(
+                    "https://www.youtube.com/feeds/videos.xml?channel_id=UCQvWX73GQygcwXOTSf_VDVg",
+                    extractor.getFeedUrl());
+        }
+
+        @Test
+        @Override
+        public void testSubscriberCount() throws Exception {
+            // Subscriber count is not available on channels with an interactiveTabbedHeaderRenderer
+            assertEquals(ChannelExtractor.UNKNOWN_SUBSCRIBER_COUNT, extractor.getSubscriberCount());
+        }
+
+        @Test
+        @Override
+        public void testVerified() throws Exception {
+            assertTrue(extractor.isVerified());
+        }
+
+        @Test
+        @Override
+        public void testTabs() throws Exception {
+            // Gaming topic channels tabs are not yet supported, so an empty list should be returned
+            assertTrue(extractor.getTabs().isEmpty());
+        }
+
+        @Test
+        @Override
+        public void testTags() throws Exception {
+            assertTrue(extractor.getTags().isEmpty());
+        }
+
+        @Test
+        @Override
+        public void testServiceId() throws Exception {
+            assertEquals(YouTube.getServiceId(), extractor.getServiceId());
+        }
+
+        @Test
+        @Override
+        public void testName() throws Exception {
+            assertContains("Minecraft", extractor.getName());
+        }
+
+        @Test
+        @Override
+        public void testId() throws Exception {
+            assertEquals("UCQvWX73GQygcwXOTSf_VDVg", extractor.getId());
+        }
+
+        @Test
+        @Override
+        public void testUrl() throws Exception {
+            assertEquals("https://www.youtube.com/channel/UCQvWX73GQygcwXOTSf_VDVg",
+                    extractor.getUrl());
+        }
+
+        @Test
+        @Override
+        public void testOriginalUrl() throws Exception {
+            assertEquals("https://www.youtube.com/channel/UCQvWX73GQygcwXOTSf_VDVg",
+                    extractor.getOriginalUrl());
+        }
+    }
 }