new_contents: import unittest
  import hashlib
  
  from .. import Session
  
  class TestSession(unittest.TestCase):
  	def setUp(self):
  		self.sess = Session()
  
  	def test_public_file_download(self):
  		url = 'https://mega.co.nz/#!2ctGgQAI!AkJMowjRiXVcSrRLn3d-e1vl47ZxZEK0CbrHGIKFY-E'
  		sha256 = '9431103cb989f2913cbc503767015ca22c0ae40942932186c59ffe6d6a69830d'
  
  		hash = hashlib.sha256()
  
  		def verify_hash(file, chunks):
  			for chunk in chunks:
  				hash.update(chunk)
  
  			self.assertEqual(hash.hexdigest(), sha256)
  
  		self.sess.download(verify_hash, url)
subject: Add test for downloading a public file