code: def test_slug_ensure_unique(self):
      rows = (
          ("hello world", 2),
          ("Ab*c #e", 2),
          ("He11O W0rld", 3),
          ("HellO WOrld ", 3),
      )
      expected = [
          "hello_world",
          "ab_c_e",
          "he11o_w0rld",
          "hello_world_2",
      ]
  
      table = Table(
          rows, ["one", "two"], [self.text_type, self.number_type]
      ).compute([("slugs", Slug("one", ensure_unique=True))])
  
      self.assertSequenceEqual(table.columns["slugs"], expected)
  
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 25 for calling the TestTableComputation obj's underlying member method code with example usage: obj.test_slug_ensure_unique() without return types