new_contents: from models import AuthenticationError,AuthenticationRequired
  import trello
  import unittest
  import os
  
  class TestTrello(unittest.TestCase):
  
  	def test_login(self):
  		username = os.environ['TRELLO_TEST_USER']
  		password = os.environ['TRELLO_TEST_PASS']
  		try:
  			trello.login(username, password)
  		except AuthenticationError:
  			self.fail("Could not authenticate")
  		except Exception as e:
  			self.fail("Unknown error: "+str(e))
  
  if __name__ == "__main__":
  	unittest.main()
  
subject: Add unit test