code: def test_zero_line():
      coords = line_nd((-1, -1), (2, 2))
      assert_equal(coords, [[-1, 0, 1], [-1, 0, 1]])
  
imports: from skimage.draw import line_nd
  from skimage._shared.testing import assert_equal
label_desc: Use image node_id 2 for calling a global function with example usage: test_zero_line() without return types