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# external
import pytest
# project
import textdistance
ALG = textdistance.Matrix
# https://en.wikipedia.org/wiki/Needleman%E2%80%93Wunsch_algorithm
NW_MATRIX = {
('A', 'A'): 10,
('G', 'G'): 7,
('C', 'C'): 9,
('T', 'T'): 8,
('A', 'G'): -1,
('A', 'C'): -3,
('A', 'T'): -4,
('G', 'C'): -5,
('G', 'T'): -3,
('C', 'T'): 0,
}
@pytest.mark.parametrize('left, right, expected', [
('', '', 1),
('', 'a', 0),
('abcd', 'abcd', 1),
('A', 'C', -3),
('G', 'G', 7),
('A', 'A', 10),
('T', 'A', -4),
('T', 'C', 0),
('A', 'G', -1),
('C', 'T', 0),
])
def test_distance(left, right, expected):
actual = ALG(NW_MATRIX, symmetric=True)(left, right)
assert actual == expected
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