old_contents: #!/usr/bin/env python
  
  from __future__ import print_function
  
  import os
  import unittest
  
  # Python 3 moved urlopen to urllib.requests
  try:
      from urllib.request import urlopen
  except ImportError:
      from urllib import urlopen
  
  from tests_common import NewOpenCVTests
  
  
  basedir = os.path.abspath(os.path.dirname(__file__))
  
  def load_tests(loader, tests, pattern):
      tests.addTests(loader.discover(basedir, pattern='test_*.py'))
      return tests
  
  if __name__ == '__main__':
      NewOpenCVTests.bootstrap()
  
new_contents: #!/usr/bin/env python
  
  from __future__ import print_function
  
  import os
  import unittest
  
  # Python 3 moved urlopen to urllib.requests
  try:
      from urllib.request import urlopen
  except ImportError:
      from urllib import urlopen
  
  from tests_common import NewOpenCVTests
  
  
  basedir = os.path.abspath(os.path.dirname(__file__))
  
  def load_tests(loader, tests, pattern):
      tests.addTests(loader.discover(basedir, pattern=os.environ.get('OPENCV_PYTEST_FILTER', 'test_') + '*.py'))
      return tests
  
  if __name__ == '__main__':
      NewOpenCVTests.bootstrap()
  
subject: add tests filter