def test_overlap(self):
'''
Test overlap between circles and rectangles.
'''
new_rect1 = Rectangle(100, 100)
new_rect2 = Rectangle(50, 150, 50, 50)
circ1 = Circle(25)
circ2 = Circle(30, 0, -5)
self.assertEqual(-50, new_rect1.get_overlap(new_rect2))
self.assertEqual(new_rect1.get_overlap(new_rect2),
new_rect2.get_overlap(new_rect1))
self.assertEqual(-50, circ1.get_overlap(new_rect1))
self.assertEqual(circ1.get_overlap(new_rect1),
new_rect1.get_overlap(circ1))
self.assertAlmostEqual(math.sqrt(2)*25 - 25,
circ1.get_overlap(new_rect2))
self.assertEqual(circ1.get_overlap(new_rect2),
new_rect2.get_overlap(circ1))
self.assertEqual(-50, circ1.get_overlap(circ2))
self.assertEqual(circ1.get_overlap(circ2),
circ2.get_overlap(circ1))
circ1.set_position(80, 50)
self.assertEqual(-20, circ1.get_overlap(new_rect2))
self.assertEqual(circ1.get_overlap(new_rect2),
new_rect2.get_overlap(circ1))
