code: def pdf1(self):
      np.random.seed(11)
      dates = [
          pd.NaT,
          datetime.datetime(2011, 12, 31),
          datetime.datetime(2011, 12, 31, 0, 0, 1),
          datetime.datetime(2011, 12, 31, 23, 59, 59),
          datetime.datetime(2012, 1, 1),
          datetime.datetime(2012, 1, 1, 0, 0, 1),
          pd.NaT,
          datetime.datetime(2012, 1, 1, 23, 59, 59),
          datetime.datetime(2012, 1, 2),
          pd.NaT,
          datetime.datetime(2012, 1, 30, 23, 59, 59),
          datetime.datetime(2012, 1, 31),
          datetime.datetime(2012, 1, 31, 0, 0, 1),
          datetime.datetime(2012, 3, 31),
          datetime.datetime(2013, 5, 3),
          datetime.datetime(2022, 5, 3),
      ]
      return pd.DataFrame(
          np.random.rand(len(dates), 2),
          index=pd.DatetimeIndex(dates),
          columns=list("AB"),
      )
  
imports: import unittest
  import datetime
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase, TestUtils
label_desc: Use image node_id 1 for calling the ResampleFrameMixin obj's underlying member method code with example usage: obj.pdf1() and returns: pd