old_contents: import pytest
  
  from em2_tests.fixture_classes import SimpleDataStore, NullPropagator
  from em2.base import Controller
  
  pytest_plugins = 'em2_tests.asyncio'
  
  
  @pytest.fixture
  def controller():
      ds = SimpleDataStore()
      return Controller(ds, NullPropagator())
  
new_contents: import pytest
  
  from em2_tests.fixture_classes import SimpleDataStore, NullPropagator
  from em2.base import Controller
  
  pytest_plugins = 'em2_tests.plugins.asyncio'
  
  
  @pytest.fixture
  def controller():
      ds = SimpleDataStore()
      return Controller(ds, NullPropagator())
  
subject: update asyncio plugin