Can I test time-sensitive logic with this skill?

Yes, it provides patterns for using Effect's built-in TestClock, which allows you to programmatically control and advance time within your test suite.

What is Schema-Driven Property Testing?

It is a testing method where you use Effect Schemas to automatically generate thousands of varied test inputs via Arbitrary, ensuring your logic holds up against edge cases without manual data entry.

How does it handle external API or database calls in tests?

It implements a Service-Oriented Testing Pattern where all I/O is wrapped in a Service (Context.Tag), allowing you to provide a mock implementation via Layers during testing.

What is the primary test runner for this skill?

This skill utilizes @effect/vitest, the standard integration for Vitest that provides Effect-aware functions like it.effect, it.scoped, and it.layer.

Effect Testing & Quality Assurance

Name: Effect Testing & Quality Assurance
Author: andrueandersoncs

byandrueandersoncs

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보안 및 테스팅

Implements robust testing patterns for Effect-based applications using @effect/vitest and schema-driven property testing.

This skill provides specialized guidance for testing TypeScript applications built with the Effect ecosystem. It focuses on the two core pillars of Effect testing: Service-Oriented Architecture for isolating external dependencies and Schema-driven property testing for comprehensive edge-case coverage. By leveraging @effect/vitest utilities like it.effect and it.layer, the skill helps developers replace manual mocks with deterministic test layers and move away from hand-crafted test data in favor of automated generation via Schema.Arbitrary, ultimately aiming for 100% test coverage with zero flaky tests.

주요 기능

01Service-oriented mocking patterns using Context Tags and Layer composition

02Deterministic time manipulation and async testing via TestClock integration

03Automated test data generation using Schema.Arbitrary for property-based testing

043 GitHub stars

05Native @effect/vitest integration for Effect-aware test execution and scoped resources

06Stateful repository testing patterns utilizing Ref and Layer.effect

사용 사례

01Mocking complex external dependencies like APIs and databases with test-only layers

02Refactoring legacy Vitest suites to use Effect-native testing utilities

03Scaling test coverage by replacing manual unit tests with property-based invariants

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add andrueandersoncs/claude-skill-effect-ts testing

For use in Claude.ai and ChatGPT

Download Skill