"""Tests for the generic DownstreamPolicy type and its invariants."""

import pytest

from core.hardening.policy import DownstreamPolicy


def test_policy_rejects_reset_shorter_than_read():
    """A reset_timeout below read_timeout is rejected at construction."""
    with pytest.raises(ValueError, match='reset_timeout'):
        DownstreamPolicy(
            connect_timeout=3, read_timeout=30, fail_max=5, reset_timeout=10
        )


def test_policy_rejects_retries_on_long_read():
    """Retries are disallowed on long-read resources."""
    with pytest.raises(ValueError, match='retries'):
        DownstreamPolicy(
            connect_timeout=3, read_timeout=30, fail_max=5, reset_timeout=30, retries=1
        )


def test_policy_allows_retries_on_short_read():
    """Retries are allowed when read_timeout is below the long-read threshold."""
    p = DownstreamPolicy(
        connect_timeout=3, read_timeout=10, fail_max=3, reset_timeout=60, retries=2
    )
    assert p.retries == 2