code: def test_stem(self):
      mpl.rcParams["date.converter"] = "concise"
  
      fig, (ax1, ax2, ax3, ax4, ax5, ax6) = plt.subplots(
          6, 1, layout="constrained"
      )
  
      limit_value = 10
      above = datetime.datetime(2023, 9, 18)
      below = datetime.datetime(2023, 11, 18)
  
      x_ranges = np.arange(1, limit_value)
      y_ranges = np.arange(1, limit_value)
  
      x_dates = np.array(
          [
              datetime.datetime(2023, 10, n)
              for n in range(1, limit_value)
          ]
      )
      y_dates = np.array(
          [
              datetime.datetime(2023, 10, n)
              for n in range(1, limit_value)
          ]
      )
  
      ax1.stem(x_dates, y_dates, bottom=above)
      ax2.stem(x_dates, y_ranges, bottom=5)
      ax3.stem(x_ranges, y_dates, bottom=below)
  
      ax4.stem(
          x_ranges, y_dates, orientation="horizontal", bottom=above
      )
      ax5.stem(x_dates, y_ranges, orientation="horizontal", bottom=5)
      ax6.stem(
          x_ranges, y_dates, orientation="horizontal", bottom=below
      )
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 41 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_stem() without return types