code: def test_epsilon_production_in_start_rule(self) -> None:
      grammar = """
          start: ['-'] $
          """
      self.assertEqual(
          self.calculate_first_sets(grammar),
          {"start": {"ENDMARKER", "'-'"}},
      )
  
imports: import unittest
  from test import test_tools
  from typing import Dict, Set
label_desc: Use image node_id 21 for calling the TestFirstSets obj's underlying member method code with example usage: obj.test_epsilon_production_in_start_rule() without return types