fix unit tests

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeChannelExtractorTest.java

@@ -32,10 +32,15 @@ public class YoutubeChannelExtractorTest extends AndroidTestCase  {
     @Override
     public void setUp() throws Exception {
         super.setUp();
+        NewPipe.init(new Downloader());
         extractor = NewPipe.getService("Youtube")
                 .getChannelExtractorInstance("https://www.youtube.com/channel/UCYJ61XIK64sp6ZFFS8sctxw", 0);
     }
 
+    public void testGetDownloader()  throws Exception {
+        assertNotNull(NewPipe.getDownloader());
+    }
+
     public void testGetChannelName() throws Exception {
         assertEquals(extractor.getChannelName(), "Gronkh");
     }

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeSearchEngineTest.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.extractor.youtube;
 
 import android.test.AndroidTestCase;
 
+import org.schabi.newpipe.Downloader;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.search.SearchEngine;
 import org.schabi.newpipe.extractor.search.SearchResult;
@@ -34,6 +35,7 @@ public class YoutubeSearchEngineTest extends AndroidTestCase {
     @Override
     public void setUp() throws Exception {
         super.setUp();
+        NewPipe.init(new Downloader());
         SearchEngine engine = NewPipe.getService("Youtube").getSearchEngineInstance();
 
         result = engine.search("this is something boring", 0, "de").getSearchResult();

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeSearchResultTest.java

@@ -2,6 +2,8 @@ package org.schabi.newpipe.extractor.youtube;
 
 import android.test.AndroidTestCase;
 
+import org.schabi.newpipe.Downloader;
+import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.search.SuggestionExtractor;
 import org.schabi.newpipe.extractor.services.youtube.YoutubeSuggestionExtractor;
@@ -35,6 +37,8 @@ public class YoutubeSearchResultTest extends AndroidTestCase {
 
     @Override
     public void setUp() throws Exception {
+        super.setUp();
+        NewPipe.init(new Downloader());
         SuggestionExtractor engine = new YoutubeSuggestionExtractor(0);
         suggestionReply = engine.suggestionList("hello", "de");
     }

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorDefaultTest.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.extractor.youtube;
 
 import android.test.AndroidTestCase;
 
+import org.schabi.newpipe.Downloader;
 import org.schabi.newpipe.extractor.AbstractStreamInfo;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
@@ -35,7 +36,9 @@ public class YoutubeStreamExtractorDefaultTest extends AndroidTestCase {
     public static final String HTTPS = "https://";
     private StreamExtractor extractor;
 
-    public void setUp() throws IOException, ExtractionException {
+    public void setUp() throws Exception {
+        super.setUp();
+        NewPipe.init(new Downloader());
         extractor = NewPipe.getService("Youtube")
                 .getExtractorInstance("https://www.youtube.com/watch?v=YQHsXMglC9A");
     }

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorGemaTest.java

@@ -39,6 +39,7 @@ public class YoutubeStreamExtractorGemaTest extends AndroidTestCase {
     public void testGemaError() throws IOException, ExtractionException {
         if(testActive) {
             try {
+                NewPipe.init(new Downloader());
                 NewPipe.getService("Youtube")
                         .getExtractorInstance("https://www.youtube.com/watch?v=3O1_3zBUKM8");
             } catch(YoutubeStreamExtractor.GemaException ge) {

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorLiveStreamTest.java

@@ -37,6 +37,8 @@ public class YoutubeStreamExtractorLiveStreamTest extends AndroidTestCase {
     public void setUp() throws IOException, ExtractionException {
         //todo: make the extractor not throw over a livestream
         /*
+
+        NewPipe.init(new Downloader());
         extractor = NewPipe.getService("Youtube")
                 .getExtractorInstance("https://www.youtube.com/watch?v=J0s6NjqdjLE", new Downloader());
                 */

app/src/androidTest/java/org/schabi/newpipe/extractor/youtube/YoutubeStreamExtractorRestrictedTest.java

@@ -2,6 +2,7 @@ package org.schabi.newpipe.extractor.youtube;
 
 import android.test.AndroidTestCase;
 
+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;
@@ -14,7 +15,9 @@ public class YoutubeStreamExtractorRestrictedTest extends AndroidTestCase {
     public static final String HTTPS = "https://";
     private StreamExtractor extractor;
 
-    public void setUp() throws IOException, ExtractionException {
+    public void setUp() throws Exception {
+        super.setUp();
+        NewPipe.init(new Downloader());
         extractor = NewPipe.getService("Youtube")
                 .getExtractorInstance("https://www.youtube.com/watch?v=i6JTvzrpBy0");
     }