effect-testing

To test Effect services and layers using Vitest, you provide test layers for dependencies and write tests using it.effect to validate effectful computations. This ensures reliable behavior for layered service compositions in your application.

You control time when testing time-dependent effects by leveraging TestClock. This allows you to deterministically adjust time within your tests to validate time-based behavior without waiting for actual system time to pass.

Yes, you can use property-based testing with Effect and Vitest by utilizing the it.effect.prop function. This demonstrates property-based tests to validate that your pure code paths uphold expected invariants across generated inputs.

The best way to test error handling scenarios in Effect applications is by using Effect.flip and Exit within your Vitest test suites. This approach allows you to assert failure scenarios and validate effectful computations across error paths.

Yes, you need @effect/vitest and vitest installed in your project to test Effect-based applications. These libraries provide the structured approach and necessary functions like it.effect to author reliable test suites for your services.

You author test suites for layered service compositions by applying test layers to dependencies and using it.effect to run the effectful computations. This validates the behavior of services across time and failure scenarios.