SDL Pipeline Shift to Mock Endpoints for Credential‑Free Integration Testing

The goal is to run integration tests in the SDL pipeline without exposing production credentials while ensuring that test behavior remains faithful to the production API.

Constraints include maintaining API contract fidelity, reproducing nuanced failure modes such as rate‑limit responses and authentication errors, and keeping the switch between mock and real endpoints controllable via environment‑specific configuration.

Uncertainty remains around how to validate that the mock provider captures all relevant edge cases and how to detect drift when the production API evolves.

What techniques can be used to generate mock responses that automatically reflect current error codes and latency profiles?

How can contract‑testing be integrated into the pipeline to enforce parity between mock and real endpoints?

Which metrics or alerts should be configured to flag a growing parity gap before code is promoted to staging?