def test_radius_changes_logged(self):
circle = Circle(2)
self.assertEqual(circle.radius_changes, [2])
circle.radius = 3
self.assertEqual(circle.radius_changes, [2, 3])
circle.diameter = 3
self.assertEqual(circle.radius_changes, [2, 3, 1.5])
def test_change_radius():
c = Circle(4)
assert c.diameter == 8
c.radius = 5
assert c.radius == 5
assert c.diameter == 10
def test_equality(self):
circleA = Circle(2)
circleB = Circle(2)
circleC = Circle(1)
self.assertTrue(circleA == circleB)
self.assertTrue(circleB != circleC != circleA)
self.assertFalse(circleA != circleB)
self.assertFalse(circleA == circleC)
self.assertFalse(circleB == circleC)
circleC.radius = 2
self.assertTrue(circleA == circleB == circleC)
self.assertFalse(circleB != circleC)
self.assertFalse(circleA != circleC)
def test_no_negative_radius(self):
circle = Circle(2)
with self.assertRaises(ValueError) as context:
circle.radius = -10
self.assertEqual(str(context.exception), "Radius cannot be negative")
def test_diameter_changes(self):
circle = Circle(2)
self.assertEqual(circle.diameter, 4)
circle.radius = 3
self.assertEqual(circle.diameter, 6)