def test_calculate_angles():
a = Point(0, 0)
b = Point(1, 0) # 0
c = Point(0, 1) # 90
d = Point(1, 1) # 45
assert a.angle(b) == 0
assert a.angle(c) == 90
assert a.angle(d) == 45
def test_calculate_trajectories():
a = Point(0, 0)
b = Point(100, 100)
e = a.angle(b)
assert e == 45