code: def test_str_isdigit(self):
      self.run_test(
          "def str_isdigit(s, t, u): return s.isdigit(), t.isdigit(), u.isdigit()",
          "e",
          "1",
          "",
          str_isdigit=[str, str, str],
      )
      self.run_test(
          "def str_isdigit_a(s, t): return s[0].isdigit(), t[0].isdigit()",
          "e",
          "1",
          str_isdigit_a=[str, str],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import List
  import unittest
label_desc: Use image node_id 40 for calling the TestStr obj's underlying member method code with example usage: obj.test_str_isdigit() without return types