code: def test_return(self):
      f = getattr(self.module, self.fprefix + "_return")
  
      assert_equal(f("a"), b"a")
  
imports: import pytest
  import textwrap
  from numpy.testing import assert_array_equal, assert_equal, assert_raises
  import numpy
  from numpy.f2py.tests import util
label_desc: Use image node_id 13 for calling the TestCharacter obj's underlying member method code with example usage: obj.test_return() without return types