code: def test_div(self):
      pdf = self.pdf1
      psdf = ps.from_pandas(pdf)
      for u in "D", "s", "ms":
          duration = np.timedelta64(1, u)
          self.assert_eq(
              (psdf["end_date"] - psdf["start_date"]) / duration,
              (pdf["end_date"] - pdf["start_date"]) / duration,
          )
  
imports: import datetime
  import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 9 for calling the SeriesDateTimeTestsMixin obj's underlying member method code with example usage: obj.test_div() without return types