code: def test_readline_size(self):
      self.tempfile()
      self.run_test(
          """
              def _readline_size(filename):
                  f = open(filename)
                  c = [f.readline(7),f.readline(3),f.readline(4),f.readline(),f.readline(10)]
                  f.close()
                  return c""",
          self.filename,
          _readline_size=[str],
      )
  
imports: from tempfile import mkstemp
  from pythran.tests import TestEnv
  import unittest
  from pythran.typing import List
label_desc: Use image node_id 16 for calling the TestFile obj's underlying member method code with example usage: obj.test_readline_size() without return types