def test_sdm_ecart():
    assert sdm_ecart([((1, 2, 3), 1), ((1, 0, 1), 1)]) == 0
    assert sdm_ecart([((2, 2, 1), 1), ((1, 5, 1), 1)]) == 3
def test_sdm_ecart():
    assert sdm_ecart([((1, 2, 3), 1), ((1, 0, 1), 1)]) == 0
    assert sdm_ecart([((2, 2, 1), 1), ((1, 5, 1), 1)]) == 3