def test_best_fit(points, sphere_expected):
points = Points(points)
sphere_fit = Sphere.best_fit(points)
assert sphere_fit.point.is_close(sphere_expected.point, abs_tol=1e-9)
assert math.isclose(sphere_fit.radius, sphere_expected.radius)
def test_best_fit_failure(points, message_expected):
with pytest.raises(ValueError, match=message_expected):
Sphere.best_fit(points)
