code: def test_bar_label(self):
      # Generate some example data with dateTime inputs
      date_list = [
          datetime.datetime(2023, 1, 1) + datetime.timedelta(days=i)
          for i in range(5)
      ]
      values = [10, 20, 15, 25, 30]
  
      # Creating the plot
      fig, ax = plt.subplots(
          1, 1, figsize=(10, 8), layout="constrained"
      )
      bars = ax.bar(date_list, values)
  
      # Add labels to the bars using bar_label
      ax.bar_label(
          bars,
          labels=[f"{val}%" for val in values],
          label_type="edge",
          color="black",
      )
  
imports: import datetime
  import numpy
  import pytest
  import matplotlib.pyplot
  import matplotlib
label_desc: Use image node_id 9 for calling the TestDatetimePlotting obj's underlying member method code with example usage: obj.test_bar_label() without return types