text: from __future__ import unicode_literals
  import unittest
  
  from oauthlib.oauth2 import WebApplicationClient, MobileApplicationClient
  from oauthlib.oauth2 import LegacyApplicationClient, BackendApplicationClient
  from requests import Request
  from requests_oauthlib import OAuth2
  
  
  class OAuth2AuthTest(unittest.TestCase):
  
      def setUp(self):
          self.token = {
              'token_type': 'Bearer',
              'access_token': 'asdfoiw37850234lkjsdfsdf',
              'expires_in': '3600'
          }
          self.client_id = 'foo'
          self.clients = [
              WebApplicationClient(self.client_id),
              MobileApplicationClient(self.client_id),
              LegacyApplicationClient(self.client_id),
              BackendApplicationClient(self.client_id),
          ]
  
      def test_add_token_to_url(self):
          url = 'https://example.com/resource?foo=bar'
          new_url = url + '&access_token=' + self.token['access_token']
          for client in self.clients:
              client.default_token_placement = 'query'
              auth = OAuth2(client=client, token=self.token)
              r = Request('GET', url, auth=auth).prepare()
              self.assertEqual(r.url, new_url)
  
      def test_add_token_to_headers(self):
          token = 'Bearer ' + self.token['access_token']
          for client in self.clients:
              auth = OAuth2(client=client, token=self.token)
              r = Request('GET', 'https://i.b', auth=auth).prepare()
              self.assertEqual(r.headers['Authorization'], token)
  
      def test_add_token_to_body(self):
          body = 'foo=bar'
          new_body = body + '&access_token=' + self.token['access_token']
          for client in self.clients:
              client.default_token_placement = 'body'
              auth = OAuth2(client=client, token=self.token)
              r = Request('GET', 'https://i.b', data=body, auth=auth).prepare()
              self.assertEqual(r.body, new_body)
  
      def test_add_nonexisting_token(self):
          for client in self.clients:
              auth = OAuth2(client=client)
              r = Request('GET', 'https://i.b', auth=auth)
              self.assertRaises(ValueError, r.prepare)
  