[YouTube] Add tests for handles and user IDs with non ASCII characters support

Unneeded public modifiers in test methods of
YoutubeChannelLinkHandlerFactoryTest have been also removed.

Author: AudricV

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

@@ -25,11 +25,12 @@ public static void setUp() {
     }
 
     @Test
-    public void acceptUrlTest() throws ParsingException {
+    void acceptUrlTest() throws ParsingException {
         assertTrue(linkHandler.acceptUrl("https://www.youtube.com/user/Gronkh"));
         assertTrue(linkHandler.acceptUrl("https://www.youtube.com/user/Netzkino/videos"));
 
         assertTrue(linkHandler.acceptUrl("https://www.youtube.com/c/creatoracademy"));
+        assertTrue(linkHandler.acceptUrl("https://www.youtube.com/c/%EB%85%B8%EB%A7%88%EB%93%9C%EC%BD%94%EB%8D%94NomadCoders"));
 
         assertTrue(linkHandler.acceptUrl("https://youtube.com/DIMENSI0N"));
 
@@ -49,6 +50,7 @@ public void acceptUrlTest() throws ParsingException {
         assertTrue(linkHandler.acceptUrl("https://invidio.us/channel/UClq42foiSgl7sSpLupnugGA/videos?disable_polymer=1"));
         assertTrue(linkHandler.acceptUrl("https://www.youtube.com/watchismo"));
 
+        assertTrue(linkHandler.acceptUrl("https://www.youtube.com/@YouTube"));
 
         // do not accept URLs which are not channels
         assertFalse(linkHandler.acceptUrl("https://www.youtube.com/watch?v=jZViOEv90dI&t=100"));
@@ -62,14 +64,13 @@ public void acceptUrlTest() throws ParsingException {
     }
 
     @Test
-    public void getIdFromUrl() throws ParsingException {
+    void getIdFromUrl() throws ParsingException {
         assertEquals("user/Gronkh", linkHandler.fromUrl("https://www.youtube.com/user/Gronkh").getId());
         assertEquals("user/Netzkino", linkHandler.fromUrl("https://www.youtube.com/user/Netzkino/videos").getId());
 
         assertEquals("channel/UClq42foiSgl7sSpLupnugGA", linkHandler.fromUrl("https://www.youtube.com/channel/UClq42foiSgl7sSpLupnugGA").getId());
         assertEquals("channel/UClq42foiSgl7sSpLupnugGA", linkHandler.fromUrl("https://www.youtube.com/channel/UClq42foiSgl7sSpLupnugGA/videos?disable_polymer=1").getId());
 
-
         assertEquals("user/Gronkh", linkHandler.fromUrl("https://hooktube.com/user/Gronkh").getId());
         assertEquals("user/Netzkino", linkHandler.fromUrl("https://hooktube.com/user/Netzkino/videos").getId());
 
@@ -84,5 +85,9 @@ public void getIdFromUrl() throws ParsingException {
 
         assertEquals("c/creatoracademy", linkHandler.fromUrl("https://www.youtube.com/c/creatoracademy").getId());
         assertEquals("c/YouTubeCreators", linkHandler.fromUrl("https://www.youtube.com/c/YouTubeCreators").getId());
+        assertEquals("c/%EB%85%B8%EB%A7%88%EB%93%9C%EC%BD%94%EB%8D%94NomadCoders", linkHandler.fromUrl("https://www.youtube.com/c/%EB%85%B8%EB%A7%88%EB%93%9C%EC%BD%94%EB%8D%94NomadCoders").getId());
+
+        assertEquals("@Gronkh", linkHandler.fromUrl("https://www.youtube.com/@Gronkh?ucbcb=1").getId());
+        assertEquals("@YouTubeCreators", linkHandler.fromUrl("https://www.youtube.com/@YouTubeCreators/shorts").getId());
     }
 }