def test_should_indicate_not_be_empty_with_non_zero_width_and_height(self):
bounding_box = BoundingBox(0, 0, 100, 100)
assert not bounding_box.is_empty()
assert bounding_box
def test_should_indicate_empty_with_zero_width(self):
bounding_box = BoundingBox(0, 0, 0, 100)
assert bounding_box.is_empty()
assert not bounding_box