code: def simple_expr(expr):
      def test_sourcegen_expr(self):
          self.assertSame(expr)
  
      return test_sourcegen_expr
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import ast
  from ...asttools.visitors.pysourcegen import SourceGen
  from ...asttools.tests import AllTypesTested
  from ...testing import py2only, py3only
label_desc: Use image node_id 1 for calling a global function with example usage: simple_expr(expr) and returns: test_sourcegen_expr