code: def test_basic(self):
      # Default value is not needed even if optional; the value would just be the
      # empty list.
      flag = flag_def.MultiValuesFlagDef(
          name="colors", parse_type=str, required=False
      )
  
      # Default value is the empty list.
      results = _new_parser(flag).parse_args([])
      self.assertEmpty(results.colors)
  
      results = _new_parser(flag).parse_args(["--colors", "red"])
      self.assertEqual(["red"], results.colors)
  
      results = _new_parser(flag).parse_args(
          ["--colors", "red", "green"]
      )
      self.assertEqual(["red", "green"], results.colors)
  
imports: from __future__ import annotations
  import argparse
  import enum
  import math
  from absl.testing import absltest
  from google.generativeai.notebook import argument_parser
  from google.generativeai.notebook import flag_def
label_desc: Use image node_id 1 for calling the MultiValuesFlagDefTest obj's underlying member method code with example usage: obj.test_basic() without return types