code: def feed_key(self, key_press):
      self.keys.append(key_press)
  
imports: from __future__ import unicode_literals
  from prompt_toolkit.terminal.vt100_input import InputStream
  from prompt_toolkit.keys import Keys
  import pytest
label_desc: Use image node_id 2 for calling the _ProcessorMock obj's underlying member method code with example usage: obj.feed_key(key_press) without return types