code: def test_subclass(fig_test, fig_ref):
      class subdate(datetime):
          pass
  
      fig_test.subplots().plot(subdate(2000, 1, 1), 0, "o")
      fig_ref.subplots().plot(datetime(2000, 1, 1), 0, "o")
  
imports: from datetime import datetime, timezone, timedelta
  import platform
  from unittest.mock import MagicMock
  import matplotlib.pyplot
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import matplotlib.units
  from matplotlib.category import UnitData
  import numpy
  import pytest
label_desc: Use image node_id 10 for calling a global function with example usage: test_subclass(fig_test, fig_ref) without return types