Add test for YouTube livestreams

The current livestream is https://www.youtube.com/watch?v=EcEMX-63PKY

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorLivestreamTest.java

@@ -0,0 +1,141 @@
+package org.schabi.newpipe.extractor.services.youtube.stream;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.schabi.newpipe.Downloader;
+import org.schabi.newpipe.extractor.MediaFormat;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.exceptions.ExtractionException;
+import org.schabi.newpipe.extractor.exceptions.ParsingException;
+import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
+import org.schabi.newpipe.extractor.stream.StreamExtractor;
+import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
+import org.schabi.newpipe.extractor.stream.StreamType;
+import org.schabi.newpipe.extractor.stream.VideoStream;
+import org.schabi.newpipe.extractor.utils.Localization;
+import org.schabi.newpipe.extractor.utils.Utils;
+
+import java.io.IOException;
+
+import static org.junit.Assert.*;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
+public class YoutubeStreamExtractorLivestreamTest {
+    private static YoutubeStreamExtractor extractor;
+
+    @BeforeClass
+    public static void setUp() throws Exception {
+        NewPipe.init(Downloader.getInstance(), new Localization("GB", "en"));
+        extractor = (YoutubeStreamExtractor) YouTube
+                .getStreamExtractor("https://www.youtube.com/watch?v=EcEMX-63PKY");
+        extractor.fetchPage();
+    }
+
+    @Test
+    public void testGetInvalidTimeStamp() throws ParsingException {
+        assertTrue(extractor.getTimeStamp() + "",
+                extractor.getTimeStamp() <= 0);
+    }
+
+    @Test
+    public void testGetTitle() throws ParsingException {
+        assertFalse(extractor.getName().isEmpty());
+    }
+
+    @Test
+    public void testGetDescription() throws ParsingException {
+        assertNotNull(extractor.getDescription());
+        assertFalse(extractor.getDescription().isEmpty());
+    }
+
+    @Test
+    public void testGetFullLinksInDescription() throws ParsingException {
+        assertTrue(extractor.getDescription().contains("https://www.instagram.com/nathalie.baraton/"));
+        assertFalse(extractor.getDescription().contains("https://www.instagram.com/nathalie.ba..."));
+    }
+
+    @Test
+    public void testGetUploaderName() throws ParsingException {
+        assertNotNull(extractor.getUploaderName());
+        assertFalse(extractor.getUploaderName().isEmpty());
+    }
+
+
+    @Test
+    public void testGetLength() throws ParsingException {
+        assertEquals(0, extractor.getLength());
+    }
+
+    @Test
+    public void testGetViewCount() throws ParsingException {
+        long count = extractor.getViewCount();
+        assertTrue(Long.toString(count), count >= 7148995);
+    }
+
+    @Test
+    public void testGetUploadDate() throws ParsingException {
+        assertTrue(extractor.getUploadDate().length() > 0);
+    }
+
+    @Test
+    public void testGetUploaderUrl() throws ParsingException {
+        assertEquals("https://www.youtube.com/channel/UCSJ4gkVC6NrvII8umztf0Ow", extractor.getUploaderUrl());
+    }
+
+    @Test
+    public void testGetThumbnailUrl() throws ParsingException {
+        assertIsSecureUrl(extractor.getThumbnailUrl());
+    }
+
+    @Test
+    public void testGetUploaderAvatarUrl() throws ParsingException {
+        assertIsSecureUrl(extractor.getUploaderAvatarUrl());
+    }
+
+    @Test
+    public void testGetAudioStreams() throws ExtractionException {
+        assertFalse(extractor.getAudioStreams().isEmpty());
+    }
+
+    @Test
+    public void testGetVideoStreams() throws ExtractionException {
+        for (VideoStream s : extractor.getVideoStreams()) {
+            assertIsSecureUrl(s.url);
+            assertTrue(s.resolution.length() > 0);
+            assertTrue(Integer.toString(s.getFormatId()),
+                    0 <= s.getFormatId() && s.getFormatId() <= 0x100);
+        }
+    }
+
+    @Test
+    public void testStreamType() throws ParsingException {
+        assertTrue(extractor.getStreamType() == StreamType.LIVE_STREAM);
+    }
+
+    @Test
+    public void testGetDashMpd() throws ParsingException {
+        // we dont expect this particular video to have a DASH file. For this purpouse we use a different test class.
+        assertTrue(extractor.getDashMpdUrl(), extractor.getDashMpdUrl().isEmpty());
+    }
+
+    @Test
+    public void testGetRelatedVideos() throws ExtractionException, IOException {
+        StreamInfoItemsCollector relatedVideos = extractor.getRelatedStreams();
+        Utils.printErrors(relatedVideos.getErrors());
+        assertFalse(relatedVideos.getItems().isEmpty());
+        assertTrue(relatedVideos.getErrors().isEmpty());
+    }
+
+    @Test
+    public void testGetSubtitlesListDefault() throws IOException, ExtractionException {
+        // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
+        assertTrue(extractor.getSubtitlesDefault().isEmpty());
+    }
+
+    @Test
+    public void testGetSubtitlesList() throws IOException, ExtractionException {
+        // Video (/view?v=YQHsXMglC9A) set in the setUp() method has no captions => null
+        assertTrue(extractor.getSubtitles(MediaFormat.TTML).isEmpty());
+    }
+}