rails-engine-testing

Rails engine integration tests require a dummy app to prove mounting and boot behavior within a host application. You create a minimal dummy app inside the host Rails application and add an initial engine integration spec to validate the configuration.

The recommended testing order for Rails engine specs prescribes a structured sequence to guide implementation. It targets dummy apps first, then engine request and routing specs, followed by generator specs and host-integration tests to ensure reliable regression coverage.

Yes, a dummy app is a hard requirement for testing Rails engine routing and request specs. The testing approach enforces a hard-gate requiring a dummy app to prove engine behavior and validate integration inside a host app.

Writing generator specs for a Rails engine involves validating engine generators within the established dummy app environment. It is part of a structured testing order that proves engine configuration and increases confidence in overall engine integration.

Limitations when testing Rails engine integration across a host app include reload-safety considerations and host-adapter interactions. Addressing these specific engine testing scenarios ensures reliable integration and prevents regressions in the host environment.