-Fixed Youtube page extraction on flagged / offensive content urls.

-Added test for flagged content url extraction.

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

@@ -0,0 +1,125 @@
+package org.schabi.newpipe.extractor.services.youtube;
+
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.schabi.newpipe.Downloader;
+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.stream.StreamExtractor;
+import org.schabi.newpipe.extractor.stream.SubtitlesFormat;
+import org.schabi.newpipe.extractor.stream.VideoStream;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.*;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
+/**
+ * Test for {@link YoutubeStreamUrlIdHandler}
+ */
+public class YoutubeStreamExtractorControversialTest {
+    private static YoutubeStreamExtractor extractor;
+
+    @BeforeClass
+    public static void setUp() throws Exception {
+        NewPipe.init(Downloader.getInstance());
+        extractor = (YoutubeStreamExtractor) YouTube
+                .getStreamExtractor("https://www.youtube.com/watch?v=T4XJQO3qol8");
+        extractor.fetchPage();
+    }
+
+    @Test
+    public void testGetInvalidTimeStamp() throws ParsingException {
+        assertTrue(extractor.getTimeStamp() + "", extractor.getTimeStamp() <= 0);
+    }
+
+    @Test
+    public void testGetValidTimeStamp() throws IOException, ExtractionException {
+        StreamExtractor extractor = YouTube.getStreamExtractor("https://youtu.be/FmG385_uUys?t=174");
+        assertEquals(extractor.getTimeStamp() + "", "174");
+    }
+
+    @Test
+    @Ignore
+    public void testGetAgeLimit() throws ParsingException {
+        assertEquals(18, extractor.getAgeLimit());
+    }
+
+    @Test
+    public void testGetName() throws ParsingException {
+        assertNotNull("name is null", extractor.getName());
+        assertFalse("name is empty", extractor.getName().isEmpty());
+    }
+
+    @Test
+    public void testGetDescription() throws ParsingException {
+        assertNotNull(extractor.getDescription());
+        assertFalse(extractor.getDescription().isEmpty());
+    }
+
+    @Test
+    public void testGetUploaderName() throws ParsingException {
+        assertNotNull(extractor.getUploaderName());
+        assertFalse(extractor.getUploaderName().isEmpty());
+    }
+
+    @Ignore // Currently there is no way get the length from restricted videos
+    @Test
+    public void testGetLength() throws ParsingException {
+        assertTrue(extractor.getLength() > 0);
+    }
+
+    @Test
+    public void testGetViews() throws ParsingException {
+        assertTrue(extractor.getViewCount() > 0);
+    }
+
+    @Test
+    public void testGetUploadDate() throws ParsingException {
+        assertTrue(extractor.getUploadDate().length() > 0);
+    }
+
+    @Test
+    public void testGetThumbnailUrl() throws ParsingException {
+        assertIsSecureUrl(extractor.getThumbnailUrl());
+    }
+
+    @Test
+    public void testGetUploaderAvatarUrl() throws ParsingException {
+        assertIsSecureUrl(extractor.getUploaderAvatarUrl());
+    }
+
+    // FIXME: 25.11.17 Are there no streams or are they not listed?
+    @Ignore
+    @Test
+    public void testGetAudioStreams() throws IOException, ExtractionException {
+        // audio streams are not always necessary
+        assertFalse(extractor.getAudioStreams().isEmpty());
+    }
+
+    @Test
+    public void testGetVideoStreams() throws IOException, ExtractionException {
+        List<VideoStream> streams = new ArrayList<>();
+        streams.addAll(extractor.getVideoStreams());
+        streams.addAll(extractor.getVideoOnlyStreams());
+        assertTrue(streams.size() > 0);
+    }
+
+
+    @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(SubtitlesFormat.TTML).isEmpty());
+    }
+}