code: def try_emitter(self, em, **kwargs):
      em.connect(self.record_event)
      self.result = None
      return em(**kwargs)
  
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 22 for calling the TestEmitters obj's underlying member method code with example usage: obj.try_emitter(em) and returns: em