def METHOD_NAME():
    mesh = openmc.RegularMesh()
    mesh.lower_left = [-2, -3, -5]
    mesh.upper_right = [2, 3, 5]
    bb = mesh.bounding_box
    assert isinstance(bb, openmc.BoundingBox)
    np.testing.assert_array_equal(bb.lower_left, (-2, -3 ,-5))
    np.testing.assert_array_equal(bb.upper_right, (2, 3, 5))