code: def test_center():
      assert np.array_equal(
          helpers.center([np.array([[0, 0, 0], [1, 1, 1]])]),
          [np.array([[-0.5, -0.5, -0.5], [0.5, 0.5, 0.5]])],
      )
  
file_path: hypertools/tests/test_helpers.py
imports: import numpy
  import hypertools._shared.helpers
label_desc: Use image node_id 1 for calling a global function with example usage: test_center() without return types