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scikit-image/skimage/_shared/tests/test_interpolation.py
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from skimage._shared.interpolation import coord_map_py
from numpy.testing import assert_array_equal
def test_coord_map():
symmetric = [coord_map_py(4, n, 'S') for n in range(-6, 6)]
expected_symmetric = [2, 3, 3, 2, 1, 0, 0, 1, 2, 3, 3, 2]
assert_array_equal(symmetric, expected_symmetric)
wrap = [coord_map_py(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)
edge = [coord_map_py(4, n, 'E') for n in range(-6, 6)]
expected_edge = [0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3]
assert_array_equal(edge, expected_edge)
reflect = [coord_map_py(4, n, 'R') for n in range(-6, 6)]
expected_reflect = [0, 1, 2, 3, 2, 1, 0, 1, 2, 3, 2, 1]
assert_array_equal(reflect, expected_reflect)
constant = [coord_map_py(4, n, 'C') for n in range(-6, 6)]
expected_constant = [0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0]
assert_array_equal(constant, expected_constant)
other = [coord_map_py(4, n, 'undefined') for n in range(-6, 6)]
assert_array_equal(other, list(range(-6, 6)))