code: def test_sub(self):
      self.assertRaises(TypeError, lambda: self.psser - "x")
      self.assertRaises(TypeError, lambda: self.psser - 1)
      self.assert_eq(
          (self.pser - self.some_datetime)
          .dt.total_seconds()
          .astype("int"),
          self.psser - self.some_datetime,
      )
  
      pdf, psdf = self.pdf, self.psdf
      for col in self.df_cols:
          if col == "datetime":
              self.assert_eq(
                  (pdf["datetime"] - pdf[col])
                  .dt.total_seconds()
                  .astype("int"),
                  psdf["datetime"] - psdf[col],
              )
          else:
              self.assertRaises(
                  TypeError, lambda: psdf["datetime"] - psdf[col]
              )
  
      pdf, psdf = self.datetime_pdf, self.datetime_psdf
      self.assert_eq(
          (pdf["that"] - pdf["this"]).dt.total_seconds().astype("int"),
          psdf["that"] - psdf["this"],
      )
  
imports: import datetime
  import pandas
  from pandas.api.types import CategoricalDtype
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.data_type_ops.testing_utils import OpsTestBase
label_desc: Use image node_id 7 for calling the DatetimeOpsTestsMixin obj's underlying member method code with example usage: obj.test_sub() without return types