def test_can_get_angle_between_vectors_when_zero(self, mock_dot, mock_mag):
mock_dot.return_value = 1
mock_mag.return_value = 0
vector1 = Vector(7, 1)
vector2 = Mock(Vector)
vector2.magnitude.return_value = 0.5
vector2.length.return_value = 2
self.assertAlmostEqual(vector1.angle_with(vector2), math.pi / 4, delta=0.0005)
vector2.magnitude.return_value = 0
mock_mag.return_value = 9
self.assertAlmostEqual(vector1.angle_with(vector2), math.pi / 4, delta=0.0005)
def test_can_get_angle_between_vectors(self, mock_dot, mock_mag):
mock_dot.return_value = 1
mock_mag.return_value = 4
vector1 = Vector(7, 1)
vector2 = Mock(Vector)
vector2.magnitude.return_value = 0.5
vector2.length.return_value = 2
self.assertAlmostEqual(vector1.angle_with(vector2), 1.0471, delta=0.0005)
def test_angle_requires_equal_length(self):
vector1 = Vector(-6, 8)
vector2 = Mock(Vector)
vector2.length.return_value = 3
with self.assertRaises(ValueError):
vector1.angle_with(vector2)
def test_angle_requires_vector(self):
vector1 = Vector(-6, -8)
with self.assertRaises(TypeError):
vector1.angle_with("vector")