from skimage._shared._interpolation_test import coord_map
from numpy.testing import assert_array_equal

def test_coord_map():

    reflect = [coord_map(4, n, 'R') for n in range(-6, 6)]
    expected_reflect = [2, 3, 3, 2, 1, 0, 0, 1, 2, 3, 3, 2]
    assert_array_equal(reflect, expected_reflect)

    wrap = [coord_map(4, n, 'W') for n in range(-6, 6)]
    expected_wrap = [2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1]
    assert_array_equal(wrap, expected_wrap)

    nearest = [coord_map(4, n, 'N') for n in range(-6, 6)]
    expected_neareset = [0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3]
    assert_array_equal(nearest, expected_neareset)

    other = [coord_map(4, n, 'undefined') for n in range(-6, 6)]
    assert_array_equal(other, list(range(-6, 6)))