[test] Use pytest instead of nosetests (#482)

`nosetests` is no longer being maintained : https://github.com/nose-devs/nose/issues/1099
and will stop working in py 3.10 as can be seen in #480

test/test_subtitles.py

@@ -7,7 +7,7 @@ import sys
 import unittest
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 
-from test.helper import FakeYDL, md5
+from test.helper import FakeYDL, md5, is_download_test
 
 
 from yt_dlp.extractor import (
@@ -30,6 +30,7 @@ from yt_dlp.extractor import (
 )
 
 
+@is_download_test
 class BaseTestSubtitles(unittest.TestCase):
     url = None
     IE = None
@@ -55,6 +56,7 @@ class BaseTestSubtitles(unittest.TestCase):
         return dict((l, sub_info['data']) for l, sub_info in subtitles.items())
 
 
+@is_download_test
 class TestYoutubeSubtitles(BaseTestSubtitles):
     url = 'QRS8MkLhQmM'
     IE = YoutubeIE
@@ -111,6 +113,7 @@ class TestYoutubeSubtitles(BaseTestSubtitles):
         self.assertFalse(subtitles)
 
 
+@is_download_test
 class TestDailymotionSubtitles(BaseTestSubtitles):
     url = 'http://www.dailymotion.com/video/xczg00'
     IE = DailymotionIE
@@ -134,6 +137,7 @@ class TestDailymotionSubtitles(BaseTestSubtitles):
         self.assertFalse(subtitles)
 
 
+@is_download_test
 class TestTedSubtitles(BaseTestSubtitles):
     url = 'http://www.ted.com/talks/dan_dennett_on_our_consciousness.html'
     IE = TEDIE
@@ -149,6 +153,7 @@ class TestTedSubtitles(BaseTestSubtitles):
             self.assertTrue(subtitles.get(lang) is not None, 'Subtitles for \'%s\' not extracted' % lang)
 
 
+@is_download_test
 class TestVimeoSubtitles(BaseTestSubtitles):
     url = 'http://vimeo.com/76979871'
     IE = VimeoIE
@@ -170,6 +175,7 @@ class TestVimeoSubtitles(BaseTestSubtitles):
         self.assertFalse(subtitles)
 
 
+@is_download_test
 class TestWallaSubtitles(BaseTestSubtitles):
     url = 'http://vod.walla.co.il/movie/2705958/the-yes-men'
     IE = WallaIE
@@ -191,6 +197,7 @@ class TestWallaSubtitles(BaseTestSubtitles):
         self.assertFalse(subtitles)
 
 
+@is_download_test
 class TestCeskaTelevizeSubtitles(BaseTestSubtitles):
     url = 'http://www.ceskatelevize.cz/ivysilani/10600540290-u6-uzasny-svet-techniky'
     IE = CeskaTelevizeIE
@@ -212,6 +219,7 @@ class TestCeskaTelevizeSubtitles(BaseTestSubtitles):
         self.assertFalse(subtitles)
 
 
+@is_download_test
 class TestLyndaSubtitles(BaseTestSubtitles):
     url = 'http://www.lynda.com/Bootstrap-tutorials/Using-exercise-files/110885/114408-4.html'
     IE = LyndaIE
@@ -224,6 +232,7 @@ class TestLyndaSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['en']), '09bbe67222259bed60deaa26997d73a7')
 
 
+@is_download_test
 class TestNPOSubtitles(BaseTestSubtitles):
     url = 'http://www.npo.nl/nos-journaal/28-08-2014/POW_00722860'
     IE = NPOIE
@@ -236,6 +245,7 @@ class TestNPOSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['nl']), 'fc6435027572b63fb4ab143abd5ad3f4')
 
 
+@is_download_test
 class TestMTVSubtitles(BaseTestSubtitles):
     url = 'http://www.cc.com/video-clips/p63lk0/adam-devine-s-house-party-chasing-white-swans'
     IE = ComedyCentralIE
@@ -251,6 +261,7 @@ class TestMTVSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['en']), '78206b8d8a0cfa9da64dc026eea48961')
 
 
+@is_download_test
 class TestNRKSubtitles(BaseTestSubtitles):
     url = 'http://tv.nrk.no/serie/ikke-gjoer-dette-hjemme/DMPV73000411/sesong-2/episode-1'
     IE = NRKTVIE
@@ -263,6 +274,7 @@ class TestNRKSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['no']), '544fa917d3197fcbee64634559221cc2')
 
 
+@is_download_test
 class TestRaiPlaySubtitles(BaseTestSubtitles):
     IE = RaiPlayIE
 
@@ -283,6 +295,7 @@ class TestRaiPlaySubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['it']), '4b3264186fbb103508abe5311cfcb9cd')
 
 
+@is_download_test
 class TestVikiSubtitles(BaseTestSubtitles):
     url = 'http://www.viki.com/videos/1060846v-punch-episode-18'
     IE = VikiIE
@@ -295,6 +308,7 @@ class TestVikiSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['en']), '53cb083a5914b2d84ef1ab67b880d18a')
 
 
+@is_download_test
 class TestThePlatformSubtitles(BaseTestSubtitles):
     # from http://www.3playmedia.com/services-features/tools/integrations/theplatform/
     # (see http://theplatform.com/about/partners/type/subtitles-closed-captioning/)
@@ -309,6 +323,7 @@ class TestThePlatformSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['en']), '97e7670cbae3c4d26ae8bcc7fdd78d4b')
 
 
+@is_download_test
 class TestThePlatformFeedSubtitles(BaseTestSubtitles):
     url = 'http://feed.theplatform.com/f/7wvmTC/msnbc_video-p-test?form=json&pretty=true&range=-40&byGuid=n_hardball_5biden_140207'
     IE = ThePlatformFeedIE
@@ -321,6 +336,7 @@ class TestThePlatformFeedSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['en']), '48649a22e82b2da21c9a67a395eedade')
 
 
+@is_download_test
 class TestRtveSubtitles(BaseTestSubtitles):
     url = 'http://www.rtve.es/alacarta/videos/los-misterios-de-laura/misterios-laura-capitulo-32-misterio-del-numero-17-2-parte/2428621/'
     IE = RTVEALaCartaIE
@@ -335,6 +351,7 @@ class TestRtveSubtitles(BaseTestSubtitles):
         self.assertEqual(md5(subtitles['es']), '69e70cae2d40574fb7316f31d6eb7fca')
 
 
+@is_download_test
 class TestDemocracynowSubtitles(BaseTestSubtitles):
     url = 'http://www.democracynow.org/shows/2015/7/3'
     IE = DemocracynowIE