code: def test_dedent_block_basic(self):
      code = """
      def f(x):
        if x > 0:
          return -x
        return x
      """
  
      f = self._eval_code(parser.dedent_block(code), "f")
      self.assertEqual(f(1), -1)
      self.assertEqual(f(-1), -1)
  
imports: import re
  import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import ast_util
  from nvidia.dali._autograph.pyct import errors
  from nvidia.dali._autograph.pyct import gast_util
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import pretty_printer
label_desc: Use image node_id 17 for calling the ParserTest obj's underlying member method code with example usage: obj.test_dedent_block_basic() without return types