code: def test_print_structure(self):
      table = Table(self.rows, self.column_names, self.column_types)
  
      output = StringIO()
      table.print_structure(output=output)
      lines = output.getvalue().strip().split("\n")
  
      self.assertEqual(len(lines), 5)
  
file_path: agate/tests/test_table/test_print_structure.py
imports: from io import StringIO
  from agate import Table
  from agate.data_types import Number, Text
  from agate.testcase import AgateTestCase
label_desc: Use image node_id 2 for calling the TestPrintStructure obj's underlying member method code with example usage: obj.test_print_structure() without return types