new_contents: import json
  
  from .oauth import OAuth2Test
  
  
  class ChatworkOAuth2Test(OAuth2Test):
      backend_path = 'social_core.backends.chatwork.ChatworkOAuth2'
      user_data_url = 'https://api.chatwork.com/v2/me'
      expected_username = 'hogehoge'
      access_token_body = json.dumps({
          "access_token": "pyopyopyopyopyopyopyopyopyopyo",
          "token_type": "Bearer",
          "expires_in": "1501138041000",
          "refresh_token": "pyopyopyopyopyopyo",
          "scope": "rooms.all:read_write"
      })
  
      user_data_body = json.dumps({
          "account_id": 123,
          "room_id": 322,
          "name": "Foo Bar",
          "chatwork_id": "hogehoge",
          "organization_id": 101,
          "organization_name": "Foo foobar",
          "department": "Support",
          "title": "CMO",
          "url": "http://www.example.com",
          "introduction": "",
          "mail": "hogehoge@example.com",
          "tel_organization": "",
          "tel_extension": "",
          "tel_mobile": "",
          "skype": "",
          "facebook": "",
          "twitter": "",
          "avatar_image_url": "https://www.example.com/hogehoge.jpg",
          "login_mail": "hogehoge@example.com"
      })
  
      def test_login(self):
          self.do_login()
  
      def test_partial_pipeline(self):
          self.do_partial_pipeline()
  
subject: Add test for ChatworkOAuth2 backend