def test_wide_angle_backwards2(self):
angle = angle_between(self._d, self._b)
self.assertAlmostEqual(pi, angle)
def test_wide_angle_forwards(self):
angle = angle_between(self._a, self._c)
self.assertAlmostEqual(pi, angle)
def test_angle_forwards(self):
angle = angle_between(self._a, self._b)
self.assertAlmostEqual(pi/2, angle)
def test_angle_backwards2(self):
angle = angle_between(self._c, self._d)
self.assertAlmostEqual(pi/2, angle)
def test_angle_self(self):
angle = angle_between(self._a, self._a)
self.assertEqual(0, angle)
