Isolate tests with per-test setup and teardown to prevent shared state.
npx skills add https://github.com/yanko-belov/code-craft --skill test-isolation
Please help me install this Agent Skill. Skill: test-isolation Source: https://github.com/yanko-belov/code-craft/tree/main/skills/test-isolation Command: npx skills add https://github.com/yanko-belov/code-craft --skill test-isolation
This Skill ensures tests are fully isolated, with no shared state or dependencies between tests, enabling reliable, repeatable, and parallel-friendly test execution.
Create a new test that uses beforeEach to initialize fresh service or repository, and afterEach to clean up resources. Avoid using beforeAll; ensure tests do not rely on other tests' state.
High-intent search queries and answers about installing and using this skill.
Unit tests fail in parallel when they share mutable state or rely on execution order. Isolating tests with fresh instances per test case prevents cross-test contamination and ensures deterministic outcomes regardless of run order.
Isolate tests by using beforeEach to initialize fresh services or repositories and afterEach to clean up resources. This per-test setup and teardown pattern prevents cross-test contamination and discourages shared mutable global state.
Use beforeEach for deterministic test setup. beforeAll creates shared mutable state across test cases, which breaks isolation. Initializing fresh instances in beforeEach ensures every test runs independently and produces repeatable results.
Test isolation ensures no shared state or dependencies exist between test cases. You need it for integration tests and unit test suites that must run in parallel or in any order, guaranteeing reliable and repeatable execution.
Global state breaks test isolation by creating hidden dependencies between test cases. This causes non-deterministic failures when tests run in different orders or in parallel, making test suites unreliable and difficult to debug.
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