Test or debug application use cases through their public Action API, including persistence, authorization failures, atomic rollback, and post-commit reactions. Use when adding regression tests for business operations.
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Test public handle() behavior, preferably with real domain models and database facilities. Action tests requiring Laravel or a database belong in Feature tests even when no HTTP request occurs. Use the application's TestCase and appropriate database isolation; do not mock Domain models merely to isolate an Action.
For the shared CancelOrder example, cover:
OrderCannotBeCancelled; no cancellation is persisted.Fake consumer-owned external contracts or use Laravel's HTTP/Mail/Queue fakes at the relevant boundary. An adapter's HTTP fake tests request/response translation; an Action's contract substitute tests the use case.
Separate dispatch assertions from timing tests. Event::fake() can prove dispatch intent; it does not prove a real listener waited for commit. Test the real dispatcher with a harmless recording listener: no reaction inside the transaction, one after successful commit, none after rollback.
Do not rely on a test-wide transaction to commit. For actual after-commit tests, use a database isolation strategy without an enclosing transaction (for example DatabaseMigrations) and explicitly exercise commit/rollback. Fake only the external boundary so no real external effect occurs.
HTTP validation, authentication middleware, exception rendering, and Resources belong in separate entry-point Feature tests. Run the architecture suite for adopted code too.
Read order cancellation for the implementation and connected test examples.
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Create, modify, or refactor application use cases into Laravel-native DDD Actions. Use for business operations such as placing or cancelling orders, extracting controller orchestration, and fixing use-case behavior.
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Create or change structured input for application use cases, including extracting HTTP request data for Actions invoked from controllers, jobs, or commands. Avoid DTOs for trivial scalar input.
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Create, modify, or debug business events and their follow-up reactions, including order cancellation events, queued listeners, transaction timing, and rollback behavior.
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Create, extend, or fix Eloquent business models and their state transitions. Use when moving business rules out of controllers or Actions, or explicitly migrating a model into a DDD capability.
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Create or refactor business calculations and rules spanning multiple domain objects when no single entity or value object naturally owns the behavior. Use when assessing a growing service class.
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Add, change, or debug external API integrations, vendor SDK adapters, and bridges to legacy business workflows. Use when an Action or domain service needs an outer technical dependency.
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