old_contents: #!/usr/bin/env python3
  
  import argparse
  from passgen import make_parser, sanitize_input
  import unittest
  
  
  class PassGenTestCase(unittest.TestCase):
  
      def setUp(self):
          self.parse_args = make_parser().parse_args
  
      def test_duplicate_flags(self):
          for duplicate_flag in ['dd', 'll', 'uu', 'pp', 'ss']:
              with self.assertRaises(ValueError):
                  sanitize_input(self.parse_args(['-f', duplicate_flag]))
  
      def test_no_valid_flags(self):
          for invalid_flag in ['a', 'b', 'c']:
              with self.assertRaises(ValueError):
                  sanitize_input(self.parse_args(['-f', invalid_flag]))
  
      def test_limit_lower_bound(self):
          with self.assertRaises(ValueError):
              sanitize_input(self.parse_args(['-i', '0']))
  
      def test_limit_upper_bound(self):
          with self.assertRaises(ValueError):
              sanitize_input(self.parse_args(['-i', '9']))
  
      def test_valid_flags(self):
          for valid_flag in ['dl', 'du', 'dp', 'ds', 'dlu', 'dlup', 'dlups']:
              dictionary = sanitize_input(self.parse_args(['-f', valid_flag]))
              self.assertIsInstance(dictionary, argparse.Namespace)
  
  if __name__ == '__main__':
      unittest.main(buffer=True)
  
new_contents: #!/usr/bin/env python3
  
  import argparse
  from passgen import make_parser, sanitize_input
  import unittest
  
  
  class PassGenTestCase(unittest.TestCase):
  
      def setUp(self):
          self.parse_args = make_parser().parse_args
  
      def test_duplicate_flags(self):
          for duplicate_flag in ['dd', 'll', 'uu', 'pp', 'ss']:
              with self.assertRaises(ValueError):
                  sanitize_input(self.parse_args(['-f', duplicate_flag]))
  
      def test_no_valid_flags(self):
          for invalid_flag in ['a', 'b', 'c']:
              with self.assertRaises(ValueError):
                  sanitize_input(self.parse_args(['-f', invalid_flag]))
  
      def test_limit_lower_bound(self):
          with self.assertRaises(ValueError):
              sanitize_input(self.parse_args(['-i', '0']))
  
      def test_limit_upper_bound(self):
          with self.assertRaises(ValueError):
              sanitize_input(self.parse_args(['-i', '9']))
  
      def test_valid_flags(self):
          for valid_flag in ['dl', 'du', 'dp', 'ds', 'dlu', 'dlup', 'dlups']:
              dictionary = sanitize_input(self.parse_args(['-f', valid_flag]))
              self.assertIsInstance(dictionary, argparse.Namespace)
  
      def test_valid_blacklist(self):
          dictionary = sanitize_input(self.parse_args(['-f', 'd', '-b', '012345678']))
          self.assertIsInstance(dictionary, argparse.Namespace)
  
  if __name__ == '__main__':
      unittest.main(buffer=True)
  
subject: Add unit test for valid blacklist