def test_manhattan_distance():
x = np.asarray([1, 2])
y = np.asarray([3, 4])
dist = distance.manhattan_distance(x, y)
assert dist == 4
def test_manhattan_distance():
x = np.asarray([5.1, 3.5, 1.4, 0.3])
y = np.asarray([5.4, 3.4, 1.7, 0.2])
dist = distance.manhattan_distance(x, y)
assert dist == 0.8000000000000008