Testing
This skill should be used when the user asks about "Effect testing", "@effect/vitest", "it.effect", "it.live", "it.scoped", "it.layer", "it.prop", "Schema Arbitrary", "property-based testing", "fast-check", "TestClock", "testing effects", "mocking services", "test layers", "TestContext", "Effect.provide test", "time testing", "Effect test utilities", "unit testing Effect", "generating test data", "flakyTest", "test coverage", "100% coverage", "service testing", "test doubles", "mock services", or needs to understand how to test Effect-based code.
Installation
SKILL.md
Effect testing uses @effect/vitest as the standard test runner integration. This package provides Effect-aware test functions that handle Effect execution, scoped resources, layer composition, and TestClock injection automatically.
The two pillars of Effect testing that enable 100% test coverage:
Together, these two pillars mean: services eliminate external dependencies from tests, and Arbitrary eliminates hand-crafted test data. The result is fast, deterministic, comprehensive tests with 100% coverage.
This skill should be used when the user asks about "Effect testing", "@effect/vitest", "it.effect", "it.live", "it.scoped", "it.layer", "it.prop", "Schema Arbitrary", "property-based testing", "fast-check", "TestClock", "testing effects", "mocking services", "test layers", "TestContext", "Effect.provide test", "time testing", "Effect test utilities", "unit testing Effect", "generating test data", "flakyTest", "test coverage", "100% coverage", "service testing", "test doubles", "mock services", or needs to understand how to test Effect-based code. Source: andrueandersoncs/claude-skill-effect-ts.
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/andrueandersoncs/claude-skill-effect-ts --skill Testing- Category
- </>Dev Tools
- Verified
- —
- First Seen
- 2026-02-01
- Updated
- 2026-02-18
Quick answers
What is Testing?
This skill should be used when the user asks about "Effect testing", "@effect/vitest", "it.effect", "it.live", "it.scoped", "it.layer", "it.prop", "Schema Arbitrary", "property-based testing", "fast-check", "TestClock", "testing effects", "mocking services", "test layers", "TestContext", "Effect.provide test", "time testing", "Effect test utilities", "unit testing Effect", "generating test data", "flakyTest", "test coverage", "100% coverage", "service testing", "test doubles", "mock services", or needs to understand how to test Effect-based code. Source: andrueandersoncs/claude-skill-effect-ts.
How do I install Testing?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/andrueandersoncs/claude-skill-effect-ts --skill Testing Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor
Where is the source repository?
https://github.com/andrueandersoncs/claude-skill-effect-ts
Details
- Category
- </>Dev Tools
- Source
- user
- First Seen
- 2026-02-01