code: def test_gh3425(self):
      # Test returning a copy of assumed length string
      f = getattr(self.module, self.fprefix + "_gh3425")
      # f is equivalent to bytes.upper
  
      assert_equal(f("abC"), b"ABC")
      assert_equal(f(""), b"")
      assert_equal(f("abC12d"), b"ABC12D")
  
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 4 for calling the TestMiscCharacter obj's underlying member method code with example usage: obj.test_gh3425() without return types