code: def test_annotate(self):
      mpl.rcParams["date.converter"] = "concise"
      fig, (ax1, ax2, ax3, ax4) = plt.subplots(
          4, 1, layout="constrained"
      )
  
      start_date = datetime.datetime(2023, 10, 1)
      dates = [
          start_date + datetime.timedelta(days=i) for i in range(31)
      ]
      data = list(range(1, 32))
      test_text = "Test Text"
  
      ax1.plot(dates, data)
      ax1.annotate(text=test_text, xy=(dates[15], data[15]))
      ax2.plot(data, dates)
      ax2.annotate(text=test_text, xy=(data[5], dates[26]))
      ax3.plot(dates, dates)
      ax3.annotate(text=test_text, xy=(dates[15], dates[3]))
      ax4.plot(dates, dates)
      ax4.annotate(
          text=test_text,
          xy=(dates[5], dates[30]),
          xytext=(dates[1], dates[7]),
          arrowprops=dict(facecolor="red"),
      )
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 1 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_annotate() without return types