code: def setup_document(self, content, **kwargs):
          
  
          self.reset()
          if isinstance(content, six.text_type):
              raise error.GrabMisuseError('Method `setup_document` accepts only '
                                          'byte string in `content` argument.')
  
          # Configure Document instance
          doc = Document(grab=self)
          doc.body = content
          doc.status = ''
          doc.head = b'HTTP/1.1 200 OK\r\n\r\n'
          doc.parse(charset=kwargs.get('document_charset'))
          doc.code = 200
          doc.total_time = 0
          doc.connect_time = 0
          doc.name_lookup_time = 0
          doc.url = ''
  
          for key, value in kwargs.items():
              setattr(doc, key, value)
  
          self.doc = doc
docs: Setup `response` object without real network requests.
  
          Useful for testing and debuging.
  
          All ``**kwargs`` will be passed to `Document` constructor.