def test_cartesianvector_dist_sq():
v = CartesianVector(1, -4)
d = v.dist_sq()
assert d == 1 + 4 * 4
v2 = CartesianVector(0, -2)
d = v.dist_sq(v2)
assert d == 1 + 2 * 2
def test_cartesianvector_dist_cubic():
v = CartesianVector(1, -4.5)
d = v.dist_cubic()
assert d == 1 + 4.5
v2 = CartesianVector(1, -3.5)
d = v.dist_cubic(v2)
assert d == 1
def test_cartesianvector_floor():
v1 = CartesianVector(1.5, -4.5)
v2 = v1.floor()
assert v2 is not v1
assert len(v2) == 2
assert v2[0] == 1
assert v2[1] == -5
def test_cartesianvector_ifloor():
v1 = CartesianVector(1.5, -4.5)
vbackup = v1
v1.ifloor()
assert v1 is vbackup
assert len(v1) == 2
assert v1[0] == 1
assert v1[1] == -5
