Improve tests and randomness

- Use the existing RNG inside YoutubeParsingHelper
- Deduplicated test-setup for YouTube tests
- Minor improvements

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeParsingHelper.java

@@ -1,3 +1,23 @@
+/*
+ * Created by Christian Schabesberger on 02.03.16.
+ *
+ * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
+ * YoutubeParsingHelper.java is part of NewPipe Extractor.
+ *
+ * NewPipe Extractor 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 Extractor 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 Extractor. If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package org.schabi.newpipe.extractor.services.youtube;
 
 import static org.schabi.newpipe.extractor.NewPipe.getDownloader;
@@ -7,7 +27,6 @@ import static org.schabi.newpipe.extractor.utils.Utils.HTTPS;
 import static org.schabi.newpipe.extractor.utils.Utils.UTF_8;
 import static org.schabi.newpipe.extractor.utils.Utils.getStringResultFromRegexArray;
 import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
-import static org.schabi.newpipe.extractor.utils.Utils.randomStringFromAlphabet;
 
 import com.grack.nanojson.JsonArray;
 import com.grack.nanojson.JsonBuilder;
@@ -29,6 +48,7 @@ import org.schabi.newpipe.extractor.playlist.PlaylistInfo;
 import org.schabi.newpipe.extractor.stream.Description;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Parser;
+import org.schabi.newpipe.extractor.utils.RandomStringFromAlphabetGenerator;
 import org.schabi.newpipe.extractor.utils.Utils;
 
 import java.io.IOException;
@@ -37,6 +57,7 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
 import java.time.LocalDate;
 import java.time.OffsetDateTime;
 import java.time.ZoneOffset;
@@ -54,26 +75,6 @@ import java.util.Random;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-/*
- * Created by Christian Schabesberger on 02.03.16.
- *
- * Copyright (C) Christian Schabesberger 2016 <chris.schabesberger@mailbox.org>
- * YoutubeParsingHelper.java is part of NewPipe Extractor.
- *
- * NewPipe Extractor 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 Extractor 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 Extractor. If not, see <https://www.gnu.org/licenses/>.
- */
-
 public final class YoutubeParsingHelper {
 
     private YoutubeParsingHelper() {
@@ -83,11 +84,6 @@ public final class YoutubeParsingHelper {
     public static final String CPN = "cpn";
     public static final String VIDEO_ID = "videoId";
 
-    /**
-     * Seed that will be used for video tests, in order to mock video requests.
-     */
-    private static final long SEED_FOR_VIDEOS_TESTS = 3000;
-
     private static final String HARDCODED_CLIENT_VERSION = "2.20220114.01.00";
     private static final String HARDCODED_KEY = "AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8";
 
@@ -122,7 +118,7 @@ public final class YoutubeParsingHelper {
     private static final String CONTENT_PLAYBACK_NONCE_ALPHABET =
             "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
 
-    private static Random numberGenerator = new Random();
+    private static Random numberGenerator = new SecureRandom();
 
     /**
      * {@code PENDING+} means that the user did not yet submit their choices.
@@ -606,12 +602,13 @@ public final class YoutubeParsingHelper {
 
         if (keyAndVersionExtracted) {
             return clientVersion;
-        } else {
+        }
+
         if (areHardcodedClientVersionAndKeyValid()) {
             clientVersion = HARDCODED_CLIENT_VERSION;
             return clientVersion;
         }
-        }
+
         throw new ExtractionException("Could not get YouTube WEB client version");
     }
 
@@ -631,12 +628,12 @@ public final class YoutubeParsingHelper {
 
         if (keyAndVersionExtracted) {
             return key;
-        } else {
+        }
+
         if (areHardcodedClientVersionAndKeyValid()) {
             key = HARDCODED_KEY;
             return key;
         }
-        }
 
         // The ANDROID API key is also valid with the WEB client so return it if we couldn't
         // extract the WEB API key.
@@ -1508,7 +1505,8 @@ public final class YoutubeParsingHelper {
      */
     @Nonnull
     public static String generateContentPlaybackNonce() {
-        return randomStringFromAlphabet(CONTENT_PLAYBACK_NONCE_ALPHABET, 16);
+        return RandomStringFromAlphabetGenerator.generate(
+                CONTENT_PLAYBACK_NONCE_ALPHABET, 16, numberGenerator);
     }
 
     /**
@@ -1524,23 +1522,7 @@ public final class YoutubeParsingHelper {
      */
     @Nonnull
     public static String generateTParameter() {
-        return randomStringFromAlphabet(CONTENT_PLAYBACK_NONCE_ALPHABET, 12);
+        return RandomStringFromAlphabetGenerator.generate(
-    }
+                CONTENT_PLAYBACK_NONCE_ALPHABET, 12, numberGenerator);
-
-    /**
-     * Set the seed for video tests.
-     *
-     * <p>
-     * This seed will be used to generate the same {@code t} and {@code cpn} values between
-     * different execution of tests so mocks can be used for stream tests.
-     * </p>
-     *
-     * <p>
-     * This method will call {@link Utils#setSecureRandomSeed(long)} with the
-     * {@link #SEED_FOR_VIDEOS_TESTS value}.
-     * </p>
-     */
-    public static void setSeedForVideoTests() {
-        Utils.setSecureRandomSeed(SEED_FOR_VIDEOS_TESTS);
     }
 }

extractor/src/main/java/org/schabi/newpipe/extractor/utils/RandomStringFromAlphabetGenerator.java

@@ -0,0 +1,35 @@
+package org.schabi.newpipe.extractor.utils;
+
+import java.util.Random;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Generates a random string from a predefined alphabet.
+ */
+public final class RandomStringFromAlphabetGenerator {
+    private RandomStringFromAlphabetGenerator() {
+        // No impl
+    }
+
+    /**
+     * Generate a random string from an alphabet.
+     *
+     * @param alphabet the characters' alphabet to use
+     * @param length   the length of the returned string (> 0)
+     * @param random   {@link Random} (or better {@link java.security.SecureRandom}) used for generating the random string
+     * @return a random string of the requested length made of only characters from the provided
+     * alphabet
+     */
+    @Nonnull
+    public static String generate(
+            final String alphabet,
+            final int length,
+            final Random random) {
+        final StringBuilder stringBuilder = new StringBuilder(length);
+        for (int i = 0; i < length; i++) {
+            stringBuilder.append(alphabet.charAt(random.nextInt(alphabet.length())));
+        }
+        return stringBuilder.toString();
+    }
+}

extractor/src/main/java/org/schabi/newpipe/extractor/utils/Utils.java

@@ -8,14 +8,13 @@ import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLDecoder;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.LinkedList;
-import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
-import java.security.SecureRandom;
 import java.util.regex.Pattern;
 
 public final class Utils {
@@ -26,7 +25,6 @@ public final class Utils {
     public static final String EMPTY_STRING = "";
     private static final Pattern M_PATTERN = Pattern.compile("(https?)?:\\/\\/m\\.");
     private static final Pattern WWW_PATTERN = Pattern.compile("(https?)?:\\/\\/www\\.");
-    private static final SecureRandom random = new SecureRandom();
 
     private Utils() {
         // no instance
@@ -75,8 +73,9 @@ public final class Utils {
             multiplier = Parser.matchGroup("[\\d]+([\\.,][\\d]+)?([KMBkmb])+", numberWord, 2);
         } catch (final ParsingException ignored) {
         }
-        final double count = Double.parseDouble(
+
-                Parser.matchGroup1("([\\d]+([\\.,][\\d]+)?)", numberWord).replace(",", "."));
+        final double count = Double.parseDouble(Parser.matchGroup1("([\\d]+([\\.,][\\d]+)?)",
+                numberWord).replace(",", "."));
         switch (multiplier.toUpperCase()) {
             case "K":
                 return (long) (count * 1e3);
@@ -443,43 +442,4 @@ public final class Utils {
         }
         return result;
     }
-
-    /**
-     * Generate a random string using the secure random device {@link #random}.
-     *
-     * <p>
-     * {@link #setSecureRandomSeed(long)} might be useful when mocking tests.
-     * </p>
-     *
-     * @param alphabet the characters' alphabet to use
-     * @param length   the length of the returned string
-     * @return a random string of the requested length made of only characters from the provided
-     * alphabet
-     */
-    @Nonnull
-    public static String randomStringFromAlphabet(final String alphabet, final int length) {
-        final StringBuilder stringBuilder = new StringBuilder();
-        for (int i = 0; i < length; ++i) {
-            stringBuilder.append(alphabet.charAt(random.nextInt(alphabet.length())));
-        }
-        return stringBuilder.toString();
-    }
-
-    /**
-     * Seed the secure random device used for {@link #randomStringFromAlphabet(String, int)}.
-     *
-     * <p>
-     * Use this in tests so that they can be mocked as the same random numbers are always
-     * generated.
-     * </p>
-     *
-     * <p>
-     * This is not intended to be used outside of tests.
-     * </p>
-     *
-     * @param seed the seed to pass to {@link SecureRandom#setSeed(long)}
-     */
-    public static void setSecureRandomSeed(final long seed) {
-        random.setSeed(seed);
-    }
 }

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

@@ -1,5 +1,17 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertContains;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestGetPageInNewExtractor;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestMoreItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -15,13 +27,6 @@ import org.schabi.newpipe.extractor.services.BaseChannelExtractorTest;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeChannelExtractor;
 
 import java.io.IOException;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.*;
-import static org.schabi.newpipe.extractor.ExtractorAsserts.assertContains;
-import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.services.DefaultTests.*;
 
 /**
  * Test for {@link ChannelExtractor}
@@ -33,8 +38,7 @@ public class YoutubeChannelExtractorTest {
     public static class NotAvailable {
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "notAvailable"));
         }
 
@@ -130,8 +134,7 @@ public class YoutubeChannelExtractorTest {
     public static class NotSupported {
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "notSupported"));
         }
 
@@ -149,8 +152,7 @@ public class YoutubeChannelExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "gronkh"));
             extractor = (YoutubeChannelExtractor) YouTube
                     .getChannelExtractor("http://www.youtube.com/user/Gronkh");
@@ -246,8 +248,7 @@ public class YoutubeChannelExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "VSauce"));
             extractor = (YoutubeChannelExtractor) YouTube
                     .getChannelExtractor("https://www.youtube.com/user/Vsauce");
@@ -342,8 +343,7 @@ public class YoutubeChannelExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "kurzgesagt"));
             extractor = (YoutubeChannelExtractor) YouTube
                     .getChannelExtractor("https://www.youtube.com/channel/UCsXVk37bltHxD1rDPwtNM8Q");
@@ -460,8 +460,7 @@ public class YoutubeChannelExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "captainDisillusion"));
             extractor = (YoutubeChannelExtractor) YouTube
                     .getChannelExtractor("https://www.youtube.com/user/CaptainDisillusion/videos");
@@ -555,8 +554,7 @@ public class YoutubeChannelExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "random"));
             extractor = (YoutubeChannelExtractor) YouTube
                     .getChannelExtractor("https://www.youtube.com/channel/UCUaQMQS9lY5lit3vurpXQ6w");

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

@@ -1,5 +1,9 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
+
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
 import org.schabi.newpipe.extractor.ListExtractor;
@@ -14,11 +18,6 @@ import java.time.temporal.ChronoUnit;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.fail;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
 
 /**
  * A class that tests multiple channels and ranges of "time ago".
@@ -30,8 +29,7 @@ public class YoutubeChannelLocalizationTest {
 
     @Test
     public void testAllSupportedLocalizations() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "localization"));
 
         testLocalizationsFor("https://www.youtube.com/user/NBCNews");

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

@@ -1,5 +1,11 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -17,13 +23,6 @@ import org.schabi.newpipe.extractor.utils.Utils;
 import java.io.IOException;
 import java.util.List;
 import java.util.Locale;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 
 public class YoutubeCommentsExtractorTest {
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/comments/";
@@ -38,8 +37,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "thomas"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -127,8 +125,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "empty"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -167,8 +164,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "hearted"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -210,8 +206,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "pinned"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -252,8 +247,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "likes"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -284,8 +278,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "localized_vote_count"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);
@@ -313,8 +306,7 @@ public class YoutubeCommentsExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "replies"));
             extractor = (YoutubeCommentsExtractor) YouTube
                     .getCommentsExtractor(url);

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

@@ -1,5 +1,12 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -10,14 +17,6 @@ import org.schabi.newpipe.extractor.services.BaseListExtractorTest;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeFeedExtractor;
 
 import java.io.IOException;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
 
 public class YoutubeFeedExtractorTest {
 
@@ -28,8 +27,7 @@ public class YoutubeFeedExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH));
             extractor = (YoutubeFeedExtractor) YouTube
                     .getFeedExtractor("https://www.youtube.com/user/Kurzgesagt");

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

@@ -1,5 +1,10 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -8,13 +13,6 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.services.BaseListExtractorTest;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeTrendingExtractor;
 
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
-
 public class YoutubeKioskExtractorTest {
 
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/kiosk/";
@@ -24,8 +22,7 @@ public class YoutubeKioskExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "trending"));
             extractor = (YoutubeTrendingExtractor) YouTube.getKioskList().getDefaultKioskExtractor();
             extractor.fetchPage();

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

@@ -31,7 +31,6 @@ import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
-import java.util.Random;
 import java.util.Set;
 
 public class YoutubeMixPlaylistExtractorTest {
@@ -47,8 +46,7 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "mix"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
             extractor = (YoutubeMixPlaylistExtractor) YouTube
@@ -142,8 +140,7 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "mixWithIndex"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
             extractor = (YoutubeMixPlaylistExtractor) YouTube
@@ -228,8 +225,7 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "myMix"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
             extractor = (YoutubeMixPlaylistExtractor) YouTube
@@ -318,8 +314,7 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "invalid"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
         }
@@ -353,8 +348,7 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "channelMix"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
             extractor = (YoutubeMixPlaylistExtractor) YouTube
@@ -417,9 +411,8 @@ public class YoutubeMixPlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
+            NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "genreMix"));
-            NewPipe.init(new DownloaderFactory().getDownloader(RESOURCE_PATH + "genreMix"));
             dummyCookie.put(YoutubeMixPlaylistExtractor.COOKIE_NAME, "whatever");
             extractor = (YoutubeMixPlaylistExtractor) YouTube
                     .getPlaylistExtractor("https://www.youtube.com/watch?v=" + VIDEO_ID

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

@@ -1,5 +1,8 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -8,10 +11,6 @@ import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 
 import java.io.IOException;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class YoutubeParsingHelperTest {
 
@@ -19,8 +18,7 @@ public class YoutubeParsingHelperTest {
 
     @BeforeAll
     public static void setUp() throws IOException {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "youtubeParsingHelper"));
     }
 

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

@@ -1,5 +1,18 @@
 package org.schabi.newpipe.extractor.services.youtube;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
+import static org.schabi.newpipe.extractor.ListExtractor.ITEM_COUNT_UNKNOWN;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestGetPageInNewExtractor;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestListOfItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestMoreItems;
+import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
@@ -16,20 +29,6 @@ import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubePlaylistE
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
 import java.io.IOException;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.schabi.newpipe.extractor.ExtractorAsserts.assertIsSecureUrl;
-import static org.schabi.newpipe.extractor.ListExtractor.ITEM_COUNT_UNKNOWN;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.services.DefaultTests.assertNoMoreItems;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestGetPageInNewExtractor;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestListOfItems;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestMoreItems;
-import static org.schabi.newpipe.extractor.services.DefaultTests.defaultTestRelatedItems;
 
 /**
  * Test for {@link YoutubePlaylistExtractor}
@@ -41,8 +40,7 @@ public class YoutubePlaylistExtractorTest {
     public static class NotAvailable {
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "notAvailable"));
         }
 
@@ -66,8 +64,7 @@ public class YoutubePlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "TimelessPopHits"));
             extractor = (YoutubePlaylistExtractor) YouTube
                     .getPlaylistExtractor("http://www.youtube.com/watch?v=lp-EO5I60KA&list=PLMC9KNkIncKtPzgY-5rmhvj7fax8fdxoj");
@@ -174,8 +171,7 @@ public class YoutubePlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "huge"));
             extractor = (YoutubePlaylistExtractor) YouTube
                     .getPlaylistExtractor("https://www.youtube.com/watch?v=8SbUC-UaAxE&list=PLWwAypAcFRgKAIIFqBr9oy-ZYZnixa_Fj");
@@ -298,8 +294,7 @@ public class YoutubePlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "learning"));
             extractor = (YoutubePlaylistExtractor) YouTube
                     .getPlaylistExtractor("https://www.youtube.com/playlist?list=PL8dPuuaLjXtOAKed_MxxWBNaPno5h3Zs8");
@@ -407,8 +402,7 @@ public class YoutubePlaylistExtractorTest {
 
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "continuations"));
         }
 

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

@@ -20,6 +20,9 @@ package org.schabi.newpipe.extractor.services.youtube;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -29,10 +32,6 @@ import org.schabi.newpipe.extractor.localization.Localization;
 import org.schabi.newpipe.extractor.suggestion.SuggestionExtractor;
 
 import java.io.IOException;
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
 
 /**
  * Test for {@link SuggestionExtractor}
@@ -45,8 +44,7 @@ public class YoutubeSuggestionExtractorTest {
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + ""), new Localization("de", "DE"));
         suggestionExtractor = YouTube.getSuggestionExtractor();
     }

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

@@ -0,0 +1,28 @@
+package org.schabi.newpipe.extractor.services.youtube;
+
+import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
+
+import java.util.Random;
+
+/**
+ * Utility class for keeping YouTube tests stateless.
+ */
+public final class YoutubeTestsUtils {
+    private YoutubeTestsUtils() {
+        // No impl
+    }
+
+    /**
+     * Clears static YT states.
+     *
+     * <p>
+     * This method needs to be called to generate all mocks of a test when running different tests
+     * at the same time.
+     * </p>
+     */
+    public static void ensureStateless() {
+        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeParsingHelper.setNumberGenerator(new Random(1));
+        YoutubeStreamExtractor.resetDeobfuscationCode();
+    }
+}

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

@@ -20,6 +20,10 @@ package org.schabi.newpipe.extractor.services.youtube;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
@@ -28,12 +32,6 @@ import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.kiosk.KioskInfo;
 import org.schabi.newpipe.extractor.linkhandler.LinkHandlerFactory;
 
-import java.util.Random;
-
-import static org.junit.jupiter.api.Assertions.assertFalse;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-
 /**
  * Test for {@link KioskInfo}
  */
@@ -46,8 +44,7 @@ public class YoutubeTrendingKioskInfoTest {
     @BeforeAll
     public static void setUp()
             throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH));
         LinkHandlerFactory LinkHandlerFactory = ((StreamingService) YouTube).getKioskList().getListLinkHandlerFactoryByType("Trending");
 

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/search/YoutubeSearchExtractorTest.java

@@ -25,7 +25,7 @@ import org.schabi.newpipe.extractor.channel.ChannelInfoItem;
 import org.schabi.newpipe.extractor.exceptions.ExtractionException;
 import org.schabi.newpipe.extractor.search.SearchExtractor;
 import org.schabi.newpipe.extractor.services.DefaultSearchExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
 import org.schabi.newpipe.extractor.stream.Description;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
@@ -35,7 +35,6 @@ import java.net.URL;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
@@ -49,8 +48,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "all"));
             extractor = YouTube.getSearchExtractor(QUERY);
             extractor.fetchPage();
@@ -72,8 +70,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "channel"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(CHANNELS), "");
             extractor.fetchPage();
@@ -97,8 +94,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "playlist"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(PLAYLISTS), "");
             extractor.fetchPage();
@@ -122,8 +118,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "videos"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -149,8 +144,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "suggestions"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -174,8 +168,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "corrected"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -199,8 +192,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "random"));
             extractor = YouTube.getSearchExtractor(QUERY);
             extractor.fetchPage();
@@ -235,8 +227,7 @@ public class YoutubeSearchExtractorTest {
     public static class PagingTest {
         @Test
         public void duplicatedItemsCheck() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "paging"));
             final SearchExtractor extractor = YouTube.getSearchExtractor("cirque du soleil", singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -254,8 +245,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "metaInfo"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -291,8 +281,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "verified"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(CHANNELS), "");
             extractor.fetchPage();
@@ -329,8 +318,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "video_uploader_avatar"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();
@@ -361,8 +349,7 @@ public class YoutubeSearchExtractorTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "video_description"));
             extractor = YouTube.getSearchExtractor(QUERY, singletonList(VIDEOS), "");
             extractor.fetchPage();

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

@@ -1,23 +1,21 @@
 package org.schabi.newpipe.extractor.services.youtube.stream;
 
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.schabi.newpipe.downloader.DownloaderFactory;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamType;
 
 import java.util.Collections;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-
 public class YoutubeStreamExtractorAgeRestrictedTest extends DefaultStreamExtractorTest {
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/stream/";
     private static final String ID = "rwcfPqbAx-0";
@@ -27,10 +25,7 @@ public class YoutubeStreamExtractorAgeRestrictedTest extends DefaultStreamExtrac
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
-        YoutubeParsingHelper.setSeedForVideoTests();
-        YoutubeStreamExtractor.resetDeobfuscationCode();
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "ageRestricted"));
         extractor = YouTube.getStreamExtractor(URL);
         extractor.fetchPage();

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

@@ -1,24 +1,22 @@
 package org.schabi.newpipe.extractor.services.youtube.stream;
 
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.schabi.newpipe.downloader.DownloaderFactory;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeStreamLinkHandlerFactory;
 import org.schabi.newpipe.extractor.stream.StreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamType;
 
 import java.util.Arrays;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-
 /**
  * Test for {@link YoutubeStreamLinkHandlerFactory}
  */
@@ -31,10 +29,7 @@ public class YoutubeStreamExtractorControversialTest extends DefaultStreamExtrac
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
-        YoutubeParsingHelper.setSeedForVideoTests();
-        YoutubeStreamExtractor.resetDeobfuscationCode();
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "controversial"));
         extractor = YouTube.getStreamExtractor(URL);
         extractor.fetchPage();

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

@@ -20,6 +20,12 @@
 
 package org.schabi.newpipe.extractor.services.youtube.stream;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.utils.Utils.EMPTY_STRING;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
@@ -35,9 +41,12 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.exceptions.PrivateContentException;
 import org.schabi.newpipe.extractor.exceptions.YoutubeMusicPremiumContentException;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
-import org.schabi.newpipe.extractor.stream.*;
+import org.schabi.newpipe.extractor.stream.Description;
+import org.schabi.newpipe.extractor.stream.StreamExtractor;
+import org.schabi.newpipe.extractor.stream.StreamSegment;
+import org.schabi.newpipe.extractor.stream.StreamType;
 
 import java.io.IOException;
 import java.net.MalformedURLException;
@@ -45,16 +54,9 @@ import java.net.URL;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.utils.Utils.EMPTY_STRING;
-
 public class YoutubeStreamExtractorDefaultTest {
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/stream/";
     static final String BASE_URL = "https://www.youtube.com/watch?v=";
@@ -63,10 +65,7 @@ public class YoutubeStreamExtractorDefaultTest {
     public static class NotAvailable {
         @BeforeAll
         public static void setUp() throws IOException {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "notAvailable"));
         }
 
@@ -121,10 +120,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "pewdiwpie"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -167,10 +163,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "unboxing"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -223,10 +216,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "ratingsDisabled"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -262,10 +252,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "streamSegmentsTagesschau"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -300,7 +287,7 @@ public class YoutubeStreamExtractorDefaultTest {
         // @formatter:on
 
         @Test
-        public void testStreamSegment0() throws Exception {
+        void testStreamSegment0() throws Exception {
             final StreamSegment segment = extractor.getStreamSegments().get(0);
             assertEquals(0, segment.getStartTimeSeconds());
             assertEquals("Guten Abend", segment.getTitle());
@@ -309,7 +296,7 @@ public class YoutubeStreamExtractorDefaultTest {
         }
 
         @Test
-        public void testStreamSegment3() throws Exception {
+        void testStreamSegment3() throws Exception {
             final StreamSegment segment = extractor.getStreamSegments().get(3);
             assertEquals(224, segment.getStartTimeSeconds());
             assertEquals("Pandemie dämpft Konjunkturprognose für 2021", segment.getTitle());
@@ -326,9 +313,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "streamSegmentsMaiLab"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -369,7 +354,7 @@ public class YoutubeStreamExtractorDefaultTest {
         // @formatter:on
 
         @Test
-        public void testStreamSegment() throws Exception {
+        void testStreamSegment() throws Exception {
             final StreamSegment segment = extractor.getStreamSegments().get(1);
             assertEquals(164, segment.getStartTimeSeconds());
             assertEquals("Was ist Vitamin D?", segment.getTitle());
@@ -396,10 +381,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "publicBroadcast"));
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
@@ -452,10 +434,7 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderTestImpl.getInstance());
             extractor = (YoutubeStreamExtractor) YouTube
                     .getStreamExtractor("https://www.youtube.com/watch?v=tjz2u2DiveM");
@@ -463,7 +442,7 @@ public class YoutubeStreamExtractorDefaultTest {
         }
 
         @Test
-        public void testGetUnlisted() {
+        void testGetUnlisted() {
             assertEquals(StreamExtractor.Privacy.UNLISTED, extractor.getPrivacy());
         }
     }
@@ -475,17 +454,14 @@ public class YoutubeStreamExtractorDefaultTest {
 
         @BeforeAll
         public static void setUp() throws Exception {
-            YoutubeParsingHelper.resetClientVersionAndKey();
+            YoutubeTestsUtils.ensureStateless();
-            YoutubeParsingHelper.setNumberGenerator(new Random(1));
-            YoutubeParsingHelper.setSeedForVideoTests();
-            YoutubeStreamExtractor.resetDeobfuscationCode();
             NewPipe.init(DownloaderTestImpl.getInstance());
             extractor = YouTube.getStreamExtractor(URL);
             extractor.fetchPage();
         }
 
         @Test
-        public void testGetLicence() throws ParsingException {
+        void testGetLicence() throws ParsingException {
             assertEquals("Creative Commons Attribution licence (reuse allowed)", extractor.getLicence());
         }
     }

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

@@ -1,24 +1,22 @@
 package org.schabi.newpipe.extractor.services.youtube.stream;
 
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.downloader.DownloaderFactory;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamType;
 
 import java.util.Arrays;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-
 public class YoutubeStreamExtractorLivestreamTest extends DefaultStreamExtractorTest {
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/stream/";
     private static final String ID = "5qap5aO4i9A";
@@ -28,10 +26,7 @@ public class YoutubeStreamExtractorLivestreamTest extends DefaultStreamExtractor
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
-        YoutubeParsingHelper.setSeedForVideoTests();
-        YoutubeStreamExtractor.resetDeobfuscationCode();
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "live"));
         extractor = YouTube.getStreamExtractor(URL);
         extractor.fetchPage();

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

@@ -19,6 +19,7 @@ import org.schabi.newpipe.extractor.playlist.PlaylistInfo.PlaylistType;
 import org.schabi.newpipe.extractor.playlist.PlaylistInfoItem;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
 import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamType;
@@ -40,10 +41,7 @@ public class YoutubeStreamExtractorRelatedMixTest extends DefaultStreamExtractor
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
-        YoutubeParsingHelper.setSeedForVideoTests();
-        YoutubeStreamExtractor.resetDeobfuscationCode();
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "relatedMix"));
         extractor = YouTube.getStreamExtractor(URL);
         extractor.fetchPage();

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

@@ -1,24 +1,22 @@
 package org.schabi.newpipe.extractor.services.youtube.stream;
 
+import static org.schabi.newpipe.extractor.ServiceList.YouTube;
+import static org.schabi.newpipe.extractor.stream.StreamExtractor.Privacy.UNLISTED;
+
 import org.junit.jupiter.api.BeforeAll;
 import org.schabi.newpipe.downloader.DownloaderFactory;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.StreamingService;
 import org.schabi.newpipe.extractor.services.DefaultStreamExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper;
+import org.schabi.newpipe.extractor.services.youtube.YoutubeTestsUtils;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamExtractor;
 import org.schabi.newpipe.extractor.stream.StreamType;
 
 import java.util.Arrays;
 import java.util.List;
-import java.util.Random;
 
 import javax.annotation.Nullable;
 
-import static org.schabi.newpipe.extractor.ServiceList.YouTube;
-import static org.schabi.newpipe.extractor.stream.StreamExtractor.Privacy.UNLISTED;
-
 public class YoutubeStreamExtractorUnlistedTest extends DefaultStreamExtractorTest {
     private static final String RESOURCE_PATH = DownloaderFactory.RESOURCE_PATH + "services/youtube/extractor/stream/";
     static final String ID = "udsB8KnIJTg";
@@ -27,10 +25,7 @@ public class YoutubeStreamExtractorUnlistedTest extends DefaultStreamExtractorTe
 
     @BeforeAll
     public static void setUp() throws Exception {
-        YoutubeParsingHelper.resetClientVersionAndKey();
+        YoutubeTestsUtils.ensureStateless();
-        YoutubeParsingHelper.setNumberGenerator(new Random(1));
-        YoutubeParsingHelper.setSeedForVideoTests();
-        YoutubeStreamExtractor.resetDeobfuscationCode();
         NewPipe.init(DownloaderFactory.getDownloader(RESOURCE_PATH + "unlisted"));
         extractor = YouTube.getStreamExtractor(URL);
         extractor.fetchPage();