code: def write(self, data, dummy=None):
      
      assert not self.closed
      if self.expected_write_data is None:
        return
  
      expected_data = self.expected_write_data.pop(0)
      if expected_data != data:
        raise ValueError('Expected %s, got %s (%s)' % (
            self._dotify(expected_data), binascii.hexlify(data),
            self._dotify(data)))
docs: Stub Write method.