def test_lower_neighbors_partial():
assert _lower_neighbors(dist_mat_1,
1) == reference_lower_neighbors(dist_mat_1, 1)
def test_lower_neighbors_zero():
d = np.array(dist_mat_1)
d[3][0] = 0
d[0][3] = 0
assert _lower_neighbors(d, inf) == reference_lower_neighbors(d, inf)
def test_lower_neighbors_inf():
assert _lower_neighbors(dist_mat_1,
inf) == reference_lower_neighbors(dist_mat_1, inf)