effect-concurrency-testing

What problem does it solve?

This Skill helps engineers validate concurrency primitives in the Effect library by providing ready-to-run test patterns and clear guidance for fiber coordination, PubSub workflows, streams, and interruption scenarios.

Core Features & Use Cases

• Coordinate fibers and synchronization: patterns using yieldNow, makeLatch, and Deferred to control execution order and readiness.
• Test PubSub and streams: patterns to publish, subscribe, and observe streams, including changes to SubscriptionRef and streams.
• Handle time and interruption: tests leveraging time control and fiber interruption to verify robust behavior under delays and cancellations.

Quick Start

Create a test using it.effect and Effect.gen to simulate a simple publisher/subscriber interaction with a latch to ensure order, then run the tests with your standard test runner.