def test_invalid_area_setter(area):
"""Test setting an invalid Volume."""
sphere = Sphere(1)
with pytest.raises(ValueError):
sphere.surface_area = area
def test_area_getter_setter(area):
"""Test setting the volume."""
sphere = Sphere(1)
sphere.surface_area = area
assert sphere.surface_area == approx(area)
assert sphere.radius == approx(np.sqrt(area / (4 * np.pi)))