text: #!/usr/bin/env python3
  # Allow direct execution
  import contextlib
  import os
  import sys
  import unittest
  
  sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
  
  import re
  import string
  import urllib.request
  from test.helper import FakeYDL, is_download_test
  
  from yt_dlp.compat import compat_str
  from yt_dlp.extractor import YoutubeIE
  from yt_dlp.jsinterp import JSInterpreter
  
  _SIG_TESTS = [
      (
          'https://s.ytimg.com/yts/jsbin/html5player-vflHOr_nV.js',
          86,
          '>=<;:/.-[+*)(\'&%$#"!ZYX0VUTSRQPONMLKJIHGFEDCBA\\yxwvutsrqponmlkjihgfedcba987654321',
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-vfldJ8xgI.js',
          85,
          '3456789a0cdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRS[UVWXYZ!"#$%&\'()*+,-./:;<=>?@',
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-vfle-mVwz.js',
          90,
          ']\\[@?>=<;:/.-,+*)(\'&%$#"hZYXWVUTSRQPONMLKJIHGFEDCBAzyxwvutsrqponmlkjiagfedcb39876',
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vfl0Cbn9e.js',
          84,
          'O1I3456789abcde0ghijklmnopqrstuvwxyzABCDEFGHfJKLMN2PQRSTUVW@YZ!"#$%&\'()*+,-./:;<=',
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vflXGBaUN.js',
          '2ACFC7A61CA478CD21425E5A57EBD73DDC78E22A.2094302436B2D377D14A3BBA23022D023B8BC25AA',
          'A52CB8B320D22032ABB3A41D773D2B6342034902.A22E87CDD37DBE75A5E52412DC874AC16A7CFCA2',
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vflBb0OQx.js',
          84,
          '123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQ0STUVWXYZ!"#$%&\'()*+,@./:;<=>'
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vfl9FYC6l.js',
          83,
          '123456789abcdefghijklmnopqr0tuvwxyzABCDETGHIJKLMNOPQRS>UVWXYZ!"#$%&\'()*+,-./:;<=F'
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vflCGk6yw/html5player.js',
          '4646B5181C6C3020DF1D9C7FCFEA.AD80ABF70C39BD369CCCAE780AFBB98FA6B6CB42766249D9488C288',
          '82C8849D94266724DC6B6AF89BBFA087EACCD963.B93C07FBA084ACAEFCF7C9D1FD0203C6C1815B6B'
      ),
      (
          'https://s.ytimg.com/yts/jsbin/html5player-en_US-vflKjOTVq/html5player.js',
          '312AA52209E3623129A412D56A40F11CB0AF14AE.3EE09501CB14E3BCDC3B2AE808BF3F1D14E7FBF12',
          '112AA5220913623229A412D56A40F11CB0AF14AE.3EE0950FCB14EEBCDC3B2AE808BF331D14E7FBF3',
      )
  ]
  
  _NSIG_TESTS = [
      (
          'https://www.youtube.com/s/player/9216d1f7/player_ias.vflset/en_US/base.js',
          'SLp9F5bwjAdhE9F-', 'gWnb9IK2DJ8Q1w',
      ),
      (
          'https://www.youtube.com/s/player/f8cb7a3b/player_ias.vflset/en_US/base.js',
          'oBo2h5euWy6osrUt', 'ivXHpm7qJjJN',
      ),
      (
          'https://www.youtube.com/s/player/2dfe380c/player_ias.vflset/en_US/base.js',
          'oBo2h5euWy6osrUt', '3DIBbn3qdQ',
      ),
      (
          'https://www.youtube.com/s/player/f1ca6900/player_ias.vflset/en_US/base.js',
          'cu3wyu6LQn2hse', 'jvxetvmlI9AN9Q',
      ),
      (
          'https://www.youtube.com/s/player/8040e515/player_ias.vflset/en_US/base.js',
          'wvOFaY-yjgDuIEg5', 'HkfBFDHmgw4rsw',
      ),
      (
          'https://www.youtube.com/s/player/e06dea74/player_ias.vflset/en_US/base.js',
          'AiuodmaDDYw8d3y4bf', 'ankd8eza2T6Qmw',
      ),
      (
          'https://www.youtube.com/s/player/5dd88d1d/player-plasma-ias-phone-en_US.vflset/base.js',
          'kSxKFLeqzv_ZyHSAt', 'n8gS8oRlHOxPFA',
      ),
  ]
  
  
  @is_download_test
  class TestPlayerInfo(unittest.TestCase):
      def test_youtube_extract_player_info(self):
          PLAYER_URLS = (
              ('https://www.youtube.com/s/player/64dddad9/player_ias.vflset/en_US/base.js', '64dddad9'),
              ('https://www.youtube.com/s/player/64dddad9/player_ias.vflset/fr_FR/base.js', '64dddad9'),
              ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-phone-en_US.vflset/base.js', '64dddad9'),
              ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-phone-de_DE.vflset/base.js', '64dddad9'),
              ('https://www.youtube.com/s/player/64dddad9/player-plasma-ias-tablet-en_US.vflset/base.js', '64dddad9'),
              # obsolete
              ('https://www.youtube.com/yts/jsbin/player_ias-vfle4-e03/en_US/base.js', 'vfle4-e03'),
              ('https://www.youtube.com/yts/jsbin/player_ias-vfl49f_g4/en_US/base.js', 'vfl49f_g4'),
              ('https://www.youtube.com/yts/jsbin/player_ias-vflCPQUIL/en_US/base.js', 'vflCPQUIL'),
              ('https://www.youtube.com/yts/jsbin/player-vflzQZbt7/en_US/base.js', 'vflzQZbt7'),
              ('https://www.youtube.com/yts/jsbin/player-en_US-vflaxXRn1/base.js', 'vflaxXRn1'),
              ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflXGBaUN.js', 'vflXGBaUN'),
              ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflKjOTVq/html5player.js', 'vflKjOTVq'),
          )
          for player_url, expected_player_id in PLAYER_URLS:
              player_id = YoutubeIE._extract_player_info(player_url)
              self.assertEqual(player_id, expected_player_id)
  
  
  @is_download_test
  class TestSignature(unittest.TestCase):
      def setUp(self):
          TEST_DIR = os.path.dirname(os.path.abspath(__file__))
          self.TESTDATA_DIR = os.path.join(TEST_DIR, 'testdata/sigs')
          if not os.path.exists(self.TESTDATA_DIR):
              os.mkdir(self.TESTDATA_DIR)
  
      def tearDown(self):
          with contextlib.suppress(OSError):
              for f in os.listdir(self.TESTDATA_DIR):
                  os.remove(f)
  
  
  def t_factory(name, sig_func, url_pattern):
      def make_tfunc(url, sig_input, expected_sig):
          m = url_pattern.match(url)
          assert m, '%r should follow URL format' % url
          test_id = m.group('id')
  
          def test_func(self):
              basename = f'player-{name}-{test_id}.js'
              fn = os.path.join(self.TESTDATA_DIR, basename)
  
              if not os.path.exists(fn):
                  urllib.request.urlretrieve(url, fn)
              with open(fn, encoding='utf-8') as testf:
                  jscode = testf.read()
              self.assertEqual(sig_func(jscode, sig_input), expected_sig)
  
          test_func.__name__ = f'test_{name}_js_{test_id}'
          setattr(TestSignature, test_func.__name__, test_func)
      return make_tfunc
  
  
  def signature(jscode, sig_input):
      func = YoutubeIE(FakeYDL())._parse_sig_js(jscode)
      src_sig = (
          compat_str(string.printable[:sig_input])
          if isinstance(sig_input, int) else sig_input)
      return func(src_sig)
  
  
  def n_sig(jscode, sig_input):
      funcname = YoutubeIE(FakeYDL())._extract_n_function_name(jscode)
      return JSInterpreter(jscode).call_function(funcname, sig_input)
  
  
  make_sig_test = t_factory(
      'signature', signature, re.compile(r'.*-(?P<id>[a-zA-Z0-9_-]+)(?:/watch_as3|/html5player)?\.[a-z]+$'))
  for test_spec in _SIG_TESTS:
      make_sig_test(*test_spec)
  
  make_nsig_test = t_factory(
      'nsig', n_sig, re.compile(r'.+/player/(?P<id>[a-zA-Z0-9_-]+)/.+.js$'))
  for test_spec in _NSIG_TESTS:
      make_nsig_test(*test_spec)
  
  
  if __name__ == '__main__':
      unittest.main()
  