Service simulation and API testing guides.
Practical guides to service simulation and workflow testing.
Test real and simulated APIs together
Load a checkout graph, connect dependencies, and test success and failure cases.
Create services, workflows, and tests
Define service behavior, share state within a session, and bind actual outputs across a graph.
Run workflow tests from your computer
Use scoped credentials and local environment variables with private API endpoints.
Understand simulation boundaries
Learn where code runs, how sessions are isolated, and what test evidence establishes.
Know what your test results establish.
Inspect actual inputs, outputs, assertions, timing, and errors for every node. Results distinguish real API observations from agent-produced simulation outputs.
Each test case starts with fresh simulated state. Passing assertions checks the behavior you specified; it does not establish equivalence to the original service. The homepage checkout illustration is an example, not evidence of a live run.
Read about sessions and test evidenceReady to build?
Read the service, workflow, and local runner documentation.