Helper to create a minimal test harness resource that wraps a root app (or any registerable) and exposes convenient testing utilities while running the full ecosystem (registration, overrides, middleware, events) without modifying the core API.
Optional
Use run instead with your testResource, as it provides the necessary toolkit.
run
Helper to create a minimal test harness resource that wraps a root app (or any registerable) and exposes convenient testing utilities while running the full ecosystem (registration, overrides, middleware, events) without modifying the core API.