old_contents: import unittest
  import os
  
  from main import generate_files, generate_output, get_sub_sequences
  
  class FileGenerationTest(unittest.TestCase):
      def setUp(self):
          # Make sure the expected files don't exist yet
          for fname in ["test_sequences", "test_words"]:
              if os.path.exists(fname):
                  os.remove(fname)
  
      def test_files_created(self):
          """
          Tests that output files are generated.
          """
          # For simplicity this will be the only I/O based test.
          # For other tests we can use output generation functions.
  
          self.assertFalse(os.path.exists("test_sequences"))
          self.assertFalse(os.path.exists("test_words"))
          generate_files([], sequences_fname="test_sequences", words_fname="test_words")
          self.assertTrue(os.path.exists("test_sequences"))
          self.assertTrue(os.path.exists("test_words"))
  
      def tearDown(self):
          # So as not to leave a mess
          for fname in ["test_sequences", "test_words"]:
              if os.path.exists(fname):
                  os.remove(fname)
  
  class OutputGenerationHelperTest(unittest.TestCase):
  
      def test_get_sub_sequences_empty(self):
          self.assertEqual(list(get_sub_sequences("")), [])
  
      def test_get_sub_sequences_short(self):
          self.assertEqual(list(get_sub_sequences("hi")), [])
  
      def test_get_sub_sequences_single(self):
          self.assertEqual(list(get_sub_sequences("cows")), ["cows"])
  
      def test_get_sub_sequences_multiple(self):
          # Tests decapitalization of letters, and non-skipping of repeat sequences
          expected_output = ["miss", "issi", "ssis", "siss", "issi", "ssip", "sipp", "ippi"]
          self.assertEqual(list(get_sub_sequences("Mississippi")), expected_output)
  
  class OutputGenerationTest(unittest.TestCase):
      def test_empty_input(self):
          self.assertEqual(generate_output([]), set([]))
  
      def test_basic_single_word(self):
          self.assertEqual(generate_output(["hello"]), {
              ("hell", "hello"),
              ("ello", "hello"),
          })
  
  if __name__ == '__main__':
      unittest.main()
  
new_contents: import unittest
  import os
  
  from main import generate_files, generate_output, get_sub_sequences
  
  class FileGenerationTest(unittest.TestCase):
      def setUp(self):
          # Make sure the expected files don't exist yet
          for fname in ["test_sequences", "test_words"]:
              if os.path.exists(fname):
                  os.remove(fname)
  
      def test_files_created(self):
          """
          Tests that output files are generated.
          """
          # For simplicity this will be the only I/O based test.
          # For other tests we can use output generation functions.
  
          self.assertFalse(os.path.exists("test_sequences"))
          self.assertFalse(os.path.exists("test_words"))
          generate_files([], sequences_fname="test_sequences", words_fname="test_words")
          self.assertTrue(os.path.exists("test_sequences"))
          self.assertTrue(os.path.exists("test_words"))
  
      def tearDown(self):
          # So as not to leave a mess
          for fname in ["test_sequences", "test_words"]:
              if os.path.exists(fname):
                  os.remove(fname)
  
  class OutputGenerationHelperTest(unittest.TestCase):
  
      def test_get_sub_sequences_empty(self):
          self.assertEqual(list(get_sub_sequences("")), [])
  
      def test_get_sub_sequences_short(self):
          self.assertEqual(list(get_sub_sequences("hi")), [])
  
      def test_get_sub_sequences_single(self):
          self.assertEqual(list(get_sub_sequences("cows")), ["cows"])
  
      def test_get_sub_sequences_multiple(self):
          # Tests decapitalization of letters, and non-skipping of repeat sequences
          expected_output = ["miss", "issi", "ssis", "siss", "issi", "ssip", "sipp", "ippi"]
          self.assertEqual(list(get_sub_sequences("Mississippi")), expected_output)
  
  class OutputGenerationTest(unittest.TestCase):
      def test_empty_input(self):
          self.assertEqual(generate_output([]), set([]))
  
      def test_single_word(self):
          # Tests decapitalization of letters, and non-skipping of repeat sequences
          self.assertEqual(generate_output(["Mississippi"]), {
              ("ippi", "Mississippi"),
              ("issi", "Mississippi"),
              ("miss", "Mississippi"),
              ("sipp", "Mississippi"),
              ("siss", "Mississippi"),
              ("ssip", "Mississippi"),
              ("ssis", "Mississippi"),
          })
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Put in complicated word to test more