def test_sphere():
s1 = Sphere(15)
assert str(s1) == "Sphere with radius: 15.000000"
assert repr(s1) == "Sphere(15)"
assert isclose(s1.volume, 943, rel_tol=.01)
assert isclose(s1.area, 2827.43, rel_tol=.01)
s1.volume = 7
assert isclose(s1.volume, 7, rel_tol=.01)
assert isclose(s1.radius, 1.29, rel_tol=.01)
s2 = Sphere.from_diameter(18)
assert s2.radius == 9
def test_set_sphere_volume():
""" Verify the area can not be set """
sphere = Sphere(3)
with pytest.raises(AttributeError):
sphere.volume = 4
def test_sphere_volume():
s = Sphere(4)
assert s.volume() == 268.082573106329