import pytest

PRIVATE_RANGES = [
    "127.0.0.1", "10.0.0.1", "192.168.1.1", "172.16.0.1",
    "169.254.0.1", "::1", "fc00::1"
]


def is_private_ip(ip: str) -> bool:
    import ipaddress
    try:
        addr = ipaddress.ip_address(ip)
        return addr.is_private or addr.is_loopback or addr.is_link_local
    except ValueError:
        return True


def test_private_ips_rejected():
    for ip in PRIVATE_RANGES:
        assert is_private_ip(ip), f"{ip} should be private"


def test_public_ip_accepted():
    assert not is_private_ip("8.8.8.8")
    assert not is_private_ip("1.1.1.1")