new_contents: import unittest
  from pyisemail import Reference
  
  class ReferenceTest(unittest.TestCase):
  
      def test_repr(self):
          r = Reference('local-part')
  
          result = repr(r)
          expected = "%s (%r)" % (r.__class__, r.__dict__)
  
          self.assertEqual(result, expected)
  
      def test_str(self):
          r = Reference('local-part')
  
          result = str(r)
          expected = "%s <%s>" % (r.citation, r.link)
  
          self.assertEqual(result, expected)
subject: Increase Reference coverage.