code: def test_denormalize_default_value(self):
      table = Table(self.rows, self.column_names, self.column_types)
  
      normalized_table = table.denormalize(
          ["first_name", "last_name"],
          "property",
          "value",
          default_value="hello",
      )
  
      normal_rows = (
          ("Jane", "Code", "female", "27"),
          ("Jim", "Program", "male", "hello"),
          ("Jim", "Bytes", "hello", "24"),
      )
  
      self.assertRows(normalized_table, normal_rows)
      self.assertColumnNames(
          normalized_table, ["first_name", "last_name", "gender", "age"]
      )
      self.assertColumnTypes(normalized_table, [Text, Text, Text, Text])
  
file_path: agate/tests/test_table/test_denormalize.py
imports: from agate import Table
  from agate.data_types import Number, Text
  from agate.testcase import AgateTestCase
  from agate.type_tester import TypeTester
label_desc: Use image node_id 5 for calling the TestDenormalize obj's underlying member method code with example usage: obj.test_denormalize_default_value() without return types