code: def test_stringify_long(self):
      column_names = ("one", "two", "three", "four", "five", "six")
      data = ("a", "b", "c", "d", "e", "f")
      row = MappedSequence(data, column_names)
  
      self.assertEqual(
          str(row),
          "<agate.MappedSequence: ('a', 'b', 'c', 'd', 'e', ...)>",
      )
  
imports: import unittest
  from agate.mapped_sequence import MappedSequence
label_desc: Use image node_id 4 for calling the TestMappedSequence obj's underlying member method code with example usage: obj.test_stringify_long() without return types