text: import unittest, password_crypto
  
  
  class TestPasswordCrypto(unittest.TestCase):
  
      def test_encode_and_validate(self):
          password = 'pass'
          password_salt, password_hash = password_crypto.encode(password)
          self.assertTrue(len(password_salt) > 0)
          self.assertTrue(len(password_hash) > 0)
  
          result = password_crypto.validate(password, password_salt, password_hash)
          self.assertTrue(result)
  
          result = password_crypto.validate(password, b'', b'')
          self.assertFalse(result)
  
  
  if __name__ == '__main__':
      unittest.main()
  