code: def test_aggregate_row_names(self):
      tableset = TableSet(
          self.tables.values(), self.tables.keys(), key_name="test"
      )
  
      new_table = tableset.aggregate([("count", Count())])
  
      self.assertRowNames(new_table, ["table1", "table2", "table3"])
  
imports: from collections import OrderedDict
  from decimal import Decimal
  from agate import Table, TableSet
  from agate.aggregations import Count, MaxLength, Mean, Min, Sum
  from agate.data_types import Number, Text
  from agate.exceptions import DataTypeError
  from agate.testcase import AgateTestCase
label_desc: Use image node_id 4 for calling the TestAggregate obj's underlying member method code with example usage: obj.test_aggregate_row_names() without return types