old_contents: 
  import mock
  
  import pmxbot.config_
  
  @mock.patch('pmxbot.config', {})
  def test_config_append(self):
  	"""
  	+= should append an item to a list
  	"""
  	pmxbot.config['foo'] = []
  	text = 'foo += {"a": 3, "b": foo}'
  	pmxbot.config_.config.config(None, None, None, None, text)
  	assert pmxbot.config['foo'][0] == {'a': 3, 'b': 'foo'}
  
new_contents: 
  import mock
  
  import pmxbot.config_
  
  @mock.patch('pmxbot.config', {})
  def test_config_append():
  	"""
  	+= should append an item to a list
  	"""
  	pmxbot.config['foo'] = []
  	text = 'foo += {"a": 3, "b": foo}'
  	pmxbot.config_.config.config(None, None, None, None, text)
  	assert pmxbot.config['foo'][0] == {'a': 3, 'b': 'foo'}
  
subject: Remove spurious parameter