Policy Application

Typical flow

1. Register policy with register_policy.

2. Apply directly with fault("name") or indirectly with fault("auto") + policy_context.

3. Assert behavior in HTTP/TCP/UDP client tests.

Minimal integration example

import faultcore


faultcore.register_policy(name="client_degraded", timeout={"connect": "250ms", "recv": "900ms"}, packet_loss="1%")


@faultcore.fault("client_degraded")
def call_service() -> str:
    return "ok"


def test_http_client_policy_profile() -> None:
    assert call_service() == "ok"

Common errors

• Using fault("auto") without setting thread policy.

• Defining policy names inconsistently across test suite.