How Sequence Mocks Let You Test Retry and Recovery Logic Without a Real Backend

Testing retry logic is difficult because static mocks always return the same response, meaning failure-and-recovery scenarios never actually execute during development. A tool called ScenarioMock addresses this with a 'Sequence' scenario that returns different responses based on how many times an endpoint has been called. Developers can configure an ordered list of steps — for example, two 503 errors followed by a 200 success — to verify that clients back off correctly, stop at retry limits, and recover cleanly. The setup requires no code changes, supports configurable delays to simulate timeouts, and can be scoped per IP so each caller gets an independent counter. A public demo endpoint is available for testing without sign-up, though its global counter is shared across all users.