def test_previous_returns_last_area_if_first_is_given(self) -> None:
first_area = AreaFactory.create()
last_area = AreaFactory.create()
circle = Circle(
first_area,
last_area,
)
self.assertEqual(circle.previous(first_area.id), last_area)
def test_previous_raises_unknown_area_error_if_area_not_within_cicle(
self) -> None:
circle = Circle(AreaFactory.create(), )
with self.assertRaises(UnknownArea):
circle.previous(AreaIdFactory.create())
def test_previous_returns_area_previous_to_the_given(self) -> None:
first_area = AreaFactory.create()
last_area = AreaFactory.create()
circle = Circle(first_area, last_area)
self.assertEqual(circle.previous(last_area.id), first_area)