code: def testActivePlugins(self):
      x = event_multiplexer.EventMultiplexer(
          {"run1": "path1", "run2": "path2"}
      )
      self.assertCountEqual(
          x.ActivePlugins(), ["path1_plugin", "path2_plugin"]
      )
  
imports: import os
  import os.path
  import queue
  import shutil
  import tensorflow
  from tensorboard.backend.event_processing import plugin_event_accumulator
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.util import test_util
label_desc: Use image node_id 7 for calling the EventMultiplexerTest obj's underlying member method code with example usage: obj.testActivePlugins() without return types