new_contents: import hashlib
  import unittest
  
  from gravtr import Gravtr
  
  class GravtrTestCase(unittest.TestCase):
      def setUp(self):
          self.email = "gfabricio@gmail.com".encode('utf-8')
          self.gravtr_url = ("http://www.gravatar.com/avatar/" +
                       hashlib.md5(self.email).hexdigest())
  
  
      def test_generate_url_should_succeed(self):
          gravtr = Gravtr(email=self.email)
          assert self.gravtr_url, gravtr.generate()
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: add a simple test