code: def test_next_islice(self):
      self.run_test(
          "def next_islice(n): from itertools import islice ; x = islice(n,8) ; next(x) ; return list(map(str, x))",
          list(range(-5, 5)),
          next_islice=[List[int]],
      )
  
imports: from pythran.tests import TestEnv
  import unittest
  import numpy
  from pythran.typing import List, NDArray
label_desc: Use image node_id 30 for calling the TestItertools obj's underlying member method code with example usage: obj.test_next_islice() without return types