code: def test_axvline(self):
      mpl.rcParams["date.converter"] = "concise"
      fig, (ax1, ax2, ax3) = plt.subplots(3, 1, layout="constrained")
      ax1.set_xlim(
          left=datetime.datetime(2020, 4, 1),
          right=datetime.datetime(2020, 8, 1),
      )
      ax2.set_xlim(
          left=np.datetime64("2005-01-01"),
          right=np.datetime64("2005-04-01"),
      )
      ax3.set_xlim(
          left=datetime.datetime(2023, 9, 1),
          right=datetime.datetime(2023, 11, 1),
      )
      ax1.axvline(x=datetime.datetime(2020, 6, 3), ymin=0.5, ymax=0.7)
      ax2.axvline(np.datetime64("2005-02-25T03:30"), ymin=0.1, ymax=0.9)
      ax3.axvline(x=datetime.datetime(2023, 10, 24), ymin=0.4, ymax=0.7)
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 6 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_axvline() without return types