code: def test_scatter_element0_masked():
      times = np.arange("2005-02", "2005-03", dtype="datetime64[D]")
      y = np.arange(len(times), dtype=float)
      y[0] = np.nan
      fig, ax = plt.subplots()
      ax.scatter(times, y)
      fig.canvas.draw()
  
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 8 for calling a global function with example usage: test_scatter_element0_masked() without return types