code: def test_barh(self):
      mpl.rcParams["date.converter"] = "concise"
      fig, (ax1, ax2) = plt.subplots(2, 1, layout="constrained")
      birth_date = np.array(
          [
              datetime.datetime(2020, 4, 10),
              datetime.datetime(2020, 5, 30),
              datetime.datetime(2020, 10, 12),
              datetime.datetime(2020, 11, 15),
          ]
      )
      year_start = datetime.datetime(2020, 1, 1)
      year_end = datetime.datetime(2020, 12, 31)
      age = [21, 53, 20, 24]
      ax1.set_xlabel("Age")
      ax1.set_ylabel("Birth Date")
      ax1.barh(
          birth_date, width=age, height=datetime.timedelta(days=10)
      )
      ax2.set_xlim(left=year_start, right=year_end)
      ax2.set_xlabel("Birth Date")
      ax2.set_ylabel("Order of Birth Dates")
      ax2.barh(np.arange(4), birth_date - year_start, left=year_start)
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 11 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_barh() without return types