code: def test_coord_transform_trivial():
      sform = np.eye(4)
      x = np.random.random((10,))
      y = np.random.random((10,))
      z = np.random.random((10,))
  
      x_, y_, z_ = coord_transform(x, y, z, sform)
      np.testing.assert_array_equal(x, x_)
      np.testing.assert_array_equal(y, y_)
      np.testing.assert_array_equal(z, z_)
  
      sform[:, -1] = 1
      x_, y_, z_ = coord_transform(x, y, z, sform)
      np.testing.assert_array_equal(x + 1, x_)
      np.testing.assert_array_equal(y + 1, y_)
      np.testing.assert_array_equal(z + 1, z_)
  
imports: import numpy
  from numpy.testing import assert_array_equal
  from ..coord_tools import coord_transform, find_cut_coords, find_maxsep_cut_coords
label_desc: Use image node_id 1 for calling a global function with example usage: test_coord_transform_trivial() without return types