code: def test_read_size(self):
      self.tempfile()
      self.run_test(
          """
              def _read_size(filename, size):
                  f = open(filename)
                  c = f.read(size)
                  f.close()
                  return c""",
          self.filename,
          10,
          _read_size=[str, int],
      )
  
imports: from tempfile import mkstemp
  from pythran.tests import TestEnv
  import unittest
  from pythran.typing import List
label_desc: Use image node_id 13 for calling the TestFile obj's underlying member method code with example usage: obj.test_read_size() without return types