code: def test_translation() -> None:
      x = np.arange(4)[:, None].dot(np.ones((1, 2)))
      roll = mutation.Translation(0)
      array = roll(Array(init=x))
      array.random_state.seed(12)
      array.mutate()
      expected = np.array([1, 2, 3, 0])[:, None].dot(np.ones((1, 2)))
      np.testing.assert_array_equal(array.value, 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 7 for calling a global function with example usage: test_translation() without return types