new_contents: import unittest
  import inset
  
  
  class TestInset(unittest.TestCase):
  
      def test_generate(self):
          self.assertIsInstance(inset.generate(), tuple)
          self.assertEqual(len(inset.generate(10)), 10)
  
  
  if __name__ == "__main__":
      unittest.main()
  
subject: Add inset test