code: def test_timestamp_subtraction_errors(self):
      psdf = ps.DataFrame(
          {
              "a": pd.date_range("2016-12-31", "2017-01-08", freq="D"),
              "b": pd.Series(range(9)),
          }
      )
      expected_error_message = (
          "Datetime subtraction can only be applied to datetime series."
      )
      with self.assertRaisesRegex(TypeError, expected_error_message):
          psdf["a"] - psdf["b"]
      with self.assertRaisesRegex(TypeError, expected_error_message):
          psdf["a"] - 1
      with self.assertRaisesRegex(TypeError, expected_error_message):
          1 - psdf["a"]
  
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 6 for calling the SeriesDateTimeTestsMixin obj's underlying member method code with example usage: obj.test_timestamp_subtraction_errors() without return types