old_contents: import glob
  import subprocess
  from unittest import TestCase
  
  
  class TestSerenataDeAmor(TestCase):
  
      def setUp(self):
          self.notebook_files = glob.glob('develop/*.ipynb')
  
      def test_html_versions_present(self):
          """There is a *.html version of every Jupyter notebook."""
          expected = [filename.replace('.ipynb', '.html')
                      for filename in self.notebook_files]
          html_files = glob.glob('develop/*.html')
          self.assertEqual(expected, html_files)
  
      def test_py_versions_present(self):
          """There is a *.py version of every Jupyter notebook."""
          expected = [filename.replace('.ipynb', '.py')
                      for filename in self.notebook_files]
          py_files = glob.glob('develop/*.py')
          self.assertEqual(expected, py_files)
  
new_contents: import glob
  from unittest import TestCase
  
  
  class TestSerenataDeAmor(TestCase):
  
      def setUp(self):
          self.notebook_files = glob.glob('develop/*.ipynb')
  
      def test_html_versions_present(self):
          """There is a *.html version of every Jupyter notebook."""
          expected = [filename.replace('.ipynb', '.html')
                      for filename in self.notebook_files]
          html_files = glob.glob('develop/*.html')
          self.assertEqual(expected, html_files)
  
      def test_py_versions_present(self):
          """There is a *.py version of every Jupyter notebook."""
          expected = [filename.replace('.ipynb', '.py')
                      for filename in self.notebook_files]
          py_files = glob.glob('develop/*.py')
          self.assertEqual(expected, py_files)
  
subject: Remove unused import