code: def test_for_loop(self):
      def f(n):
          for _ in range(n):
              return 1
  
      self.assertTransformedEquivalent(f, 2)
      self.assertTransformedEquivalent(f, 0)
  
imports: from tensorflow.python.autograph.converters import functions
  from tensorflow.python.autograph.converters import return_statements
  from tensorflow.python.autograph.core import converter_testing
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 16 for calling the SingleReturnTest obj's underlying member method code with example usage: obj.test_for_loop() and returns: int