code: def test_count_slice(self):
      self.run_test(
          "def count_slice(a):\n b=[1,3,4,5,3,7]\n return b[:a].count(a)",
          3,
          count_slice=[int],
      )
  
imports: from pythran.tests import TestEnv
  from pythran.typing import List, NDArray
  import numpy
label_desc: Use image node_id 12 for calling the TestList obj's underlying member method code with example usage: obj.test_count_slice() without return types