add test for YoutubeTrendingExtractor

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

@@ -102,5 +102,4 @@ public class YoutubeChannelExtractorTest {
         assertTrue("extractor didn't have next streams", !extractor.getNextStreams().nextItemsList.isEmpty());
         assertTrue("extractor didn't have more streams after getNextStreams", extractor.hasMoreStreams());
     }
-
 }

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

 package org.schabi.newpipe.extractor.services.youtube;
 
+/*
+ * Created by Christian Schabesberger on 12.08.17.
+ *
+ * Copyright (C) Christian Schabesberger 2017 <chris.schabesberger@mailbox.org>
+ * YoutubeTrendingExtractorTest.java is part of NewPipe.
+ *
+ * NewPipe is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * NewPipe is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import org.junit.Before;
+import org.junit.Test;
+import org.schabi.newpipe.Downloader;
+import org.schabi.newpipe.extractor.NewPipe;
+import org.schabi.newpipe.extractor.kiosk.KioskExtractor;
+
+import static junit.framework.TestCase.assertFalse;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
+
+/**
+ * Test for {@link YoutubeTrendingUrlIdHandler}
+ */
 public class YoutubeTrendingExtractorTest {
+
+    KioskExtractor extractor;
+
+    @Before
+    public void setUp() throws Exception {
+        NewPipe.init(Downloader.getInstance());
+        extractor = YouTube.getService()
+                .getKioskList()
+                .getExtractorByType("Trending");
+    }
+
+    @Test
+    public void testGetDownloader() throws Exception {
+        assertNotNull(NewPipe.getDownloader());
+    }
+
+    @Test
+    public void testGetName() throws Exception {
+        assertEquals(extractor.getName(), "Trending");
+    }
+
+    @Test
+    public void testId() throws Exception {
+        assertEquals(extractor.getId(), "Trending");
+    }
+
+    @Test
+    public void testGetStreams() throws Exception {
+        assertTrue("no streams are received", !extractor.getStreams().getItemList().isEmpty());
+    }
+
+    @Test
+    public void testGetStreamsErrors() throws Exception {
+        assertTrue("errors during stream list extraction", extractor.getStreams().getErrors().isEmpty());
+    }
+
+    @Test
+    public void testHasMoreStreams() throws Exception {
+        // Setup the streams
+        extractor.getStreams();
+        assertTrue("don't have more streams", extractor.hasMoreStreams());
+    }
+
+    @Test
+    public void testGetNextStreams() throws Exception {
+        assertFalse("extractor has next streams", !extractor.getNextStreams().nextItemsList.isEmpty());
+        assertFalse("extractor has more streams after getNextStreams", extractor.hasMoreStreams());
+    }
 }