code: def test_rvalue_seek(self):
      self.tempfile()
      self.run_test(
          """def _rvalue_seek(filename):\n open(filename, 'a').seek(3)""",
          self.filename,
          _rvalue_seek=[str],
      )
  
imports: from tempfile import mkstemp
  from pythran.tests import TestEnv
  import unittest
  from pythran.typing import List
label_desc: Use image node_id 47 for calling the TestFile obj's underlying member method code with example usage: obj.test_rvalue_seek() without return types