code: def test_percent_change(self):
      new_table = self.table.compute(
          [("test", PercentChange("two", "three"))]
      )
  
      self.assertIsNot(new_table, self.table)
      self.assertEqual(len(new_table.rows), 4)
      self.assertEqual(len(new_table.columns), 5)
  
      def to_one_place(d):
          return d.quantize(Decimal("0.1"))
  
      self.assertSequenceEqual(
          new_table.rows[0],
          (
              "a",
              Decimal("2"),
              Decimal("3"),
              Decimal("4"),
              Decimal("50.0"),
          ),
      )
      self.assertEqual(
          to_one_place(new_table.columns["test"][0]), Decimal("50.0")
      )
      self.assertEqual(
          to_one_place(new_table.columns["test"][1]), Decimal("66.7")
      )
      self.assertEqual(
          to_one_place(new_table.columns["test"][2]), Decimal("100.0")
      )
      self.assertEqual(
          to_one_place(new_table.columns["test"][3]), Decimal("33.3")
      )
  
imports: import datetime
  import unittest
  import warnings
  from decimal import Decimal
  from agate import Table
  from agate.computations import Change, Formula, Percent, PercentChange, PercentileRank, Rank, Slug
  from agate.data_types import Boolean, Date, DateTime, Number, Text, TimeDelta
  from agate.exceptions import CastError, DataTypeError
  from agate.warns import NullCalculationWarning
label_desc: Use image node_id 13 for calling the TestTableComputation obj's underlying member method code with example usage: obj.test_percent_change() and returns: d