old_contents: import unittest
  
  if __name__ == '__main__':
  	tests = unittest.TestLoader().discover('tests', pattern='test_*.py')
  	unittest.TextTestRunner().run(tests)
new_contents: import unittest
  
  if __name__ == '__main__':
      tests = unittest.TestLoader().discover('tests', pattern='test_*.py')
      unittest.TextTestRunner().run(tests)
  
subject: Fix more tabs.