text: import pytest
  import salt.utils.data
  import salt.utils.reactor as reactor
  from tests.support.mock import MagicMock, call, patch
  
  
  @pytest.fixture
  def minion_config():
      opts = salt.config.DEFAULT_MINION_OPTS.copy()
      opts["__role"] = "minion"
      return opts
  
  
  @pytest.fixture
  def master_config():
      opts = salt.config.DEFAULT_MASTER_OPTS.copy()
      opts["__role"] = "master"
      return opts
  
  
  @pytest.fixture
  def minion_reactor(minion_config):
      return reactor.Reactor(minion_config)
  
  
  @pytest.fixture
  def master_reactor(master_config):
      return reactor.Reactor(master_config)
  
  
  @pytest.mark.skip_on_windows(reason="Reactors unavailable on Windows")
  def test_run_minion_reactor(minion_config, minion_reactor):
      """
      Ensure that list_reactors() returns the correct list of reactor SLS
      files for each tag.
      """
  
      with patch.object(salt.utils.event, "get_event", MagicMock()):
          os_nice_mock = MagicMock(return_value=True)
          with patch("os.nice", os_nice_mock):
              # By default os.nice should not be called
              minion_reactor.run()
              assert os_nice_mock.mock_calls == []
  
              # if reactor_niceness is set, os.nice should be called with that value
              with patch.dict(minion_config, {"reactor_niceness": 9}):
                  minion_reactor.run()
                  calls = [call(9)]
                  os_nice_mock.assert_has_calls(calls)
  
  
  @pytest.mark.skip_on_windows(reason="Reactors unavailable on Windows")
  def test_run_master_reactor(master_config, master_reactor):
      """
      Ensure that list_reactors() returns the correct list of reactor SLS
      files for each tag.
      """
  
      with patch.object(salt.utils.event, "get_event", MagicMock()):
          os_nice_mock = MagicMock(return_value=True)
          with patch("os.nice", os_nice_mock):
              # By default os.nice should not be called
              master_reactor.run()
              assert os_nice_mock.mock_calls == []
  
              # if reactor_niceness is set, os.nice should be called with that value
              with patch.dict(master_config, {"reactor_niceness": 9}):
                  master_reactor.run()
                  calls = [call(9)]
                  os_nice_mock.assert_has_calls(calls)
  