code: def test_output_handler_output_transform(dirname):
      wrapper = OutputHandler("tag", output_transform=lambda x: x)
      mock_logger = MagicMock(spec=VisdomLogger)
      mock_logger.vis = MagicMock()
      mock_logger.executor = _DummyExecutor()
  
      mock_engine = MagicMock()
      mock_engine.state = State()
      mock_engine.state.output = 12345
      mock_engine.state.iteration = 123
  
      wrapper(mock_engine, mock_logger, Events.ITERATION_STARTED)
  
      assert (
          len(wrapper.windows) == 1 and "tag/output" in wrapper.windows
      )
      assert wrapper.windows["tag/output"]["win"] is not None
  
      mock_logger.vis.line.assert_called_once_with(
          X=[123],
          Y=[12345],
          env=mock_logger.vis.env,
          win=None,
          update=None,
          opts=wrapper.windows["tag/output"]["opts"],
          name="tag/output",
      )
  
      wrapper = OutputHandler(
          "another_tag", output_transform=lambda x: {"loss": x}
      )
      mock_logger = MagicMock(spec=VisdomLogger)
      mock_logger.vis = MagicMock()
      mock_logger.executor = _DummyExecutor()
  
      wrapper(mock_engine, mock_logger, Events.ITERATION_STARTED)
  
      assert (
          len(wrapper.windows) == 1
          and "another_tag/loss" in wrapper.windows
      )
      assert wrapper.windows["another_tag/loss"]["win"] is not None
  
      mock_logger.vis.line.assert_called_once_with(
          X=[123],
          Y=[12345],
          env=mock_logger.vis.env,
          win=None,
          update=None,
          opts=wrapper.windows["another_tag/loss"]["opts"],
          name="another_tag/loss",
      )
  
imports: import sys
  from unittest.mock import ANY, call, MagicMock, patch
  import pytest
  import torch
  from ignite.contrib.handlers.visdom_logger import _DummyExecutor, global_step_from_engine, GradsScalarHandler, OptimizerParamsHandler, OutputHandler, VisdomLogger, WeightsScalarHandler
  from ignite.engine import Engine, Events, State
label_desc: Use image node_id 4 for calling a global function with example usage: test_output_handler_output_transform(dirname) without return types