code: def test_while(self):
      simple_case(
          self, "a = 1\nwhile x: a = 2", "a = 1\nwhile x: a = 2"
      )
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import ast
  from ...asttools.mutators.remove_trivial import remove_trivial
  from ...asttools.tests import assert_ast_eq, skip_networkx
  from ...asttools.visitors.graph_visitor import GraphGen
label_desc: Use image node_id 15 for calling the Test obj's underlying member method code with example usage: obj.test_while() without return types