code: def test_rolling_mean(window: int, expected: tp.List[int]) -> None:
      output = mutation.rolling_mean(np.array([1, 2, 5, 9]), window)
      np.testing.assert_array_equal(output, expected)
  
file_path: nevergrad/nevergrad/parametrization/test_mutation.py
imports: import typing
  import numpy
  from nevergrad.common import testing
  from .None import mutation
  from .data import Array
label_desc: Use image node_id 10 for calling a global function with example usage: test_rolling_mean(window, expected) without return types