docstr: Extra Event kwargs
docstr_tok: ["Extra","Event","kwargs"]
code: def test_event_kwargs(self):
      """Extra Event kwargs"""
      em = EventEmitter(type="test_event")
      em.default_args["key1"] = "test1"
      em.connect(self.record_event)
      self.result = None
      em(key2="test2")
      self.assert_result(key1="test1", key2="test2")
  
imports: import unittest
  import copy
  import functools
  from vispy.util.event import Event, EventEmitter
  from vispy.testing import run_tests_if_main, assert_raises, assert_equal
label_desc: Use image node_id 5 for calling the TestEmitters obj's underlying member method code with example usage: obj.test_event_kwargs() without return types