How do I handle slow asynchronous setups in Bun?

The skill demonstrates how to apply custom timeouts to specific hooks (e.g., beforeAll) to ensure slow database migrations or server boots don't fail the test suite.

Can I use this skill for global test configurations?

Absolutely. The skill includes instructions for using the --preload flag and bunfig.toml for global setups that run across all test files.

Does this cover state leaks between tests?

Yes, it provides common patterns for using afterEach to restore mocks and reset environment variables, ensuring each test runs in a clean environment.

What happens if a setup hook fails?

As detailed in the skill, if a hook like beforeAll throws an error, all tests within that describe block or file will automatically fail to prevent inconsistent results.

Is Bun's test runner compatible with Jest hooks?

Yes, Bun provides a Jest-compatible API, and this skill covers all standard hooks including beforeAll, afterAll, beforeEach, and afterEach.

Bun Test Lifecycle

Name: Bun Test Lifecycle
Author: secondsky

bysecondsky

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Security & Testing

Manages test setup and teardown routines using Bun's native testing lifecycle hooks and preload scripts.

About

This skill provides comprehensive guidance on implementing and optimizing test lifecycles within the Bun environment. It offers production-ready patterns for database initialization, server setup, and mock management using Jest-compatible hooks like beforeAll and beforeEach. Whether you are handling complex nested suites, managing asynchronous teardowns, or configuring global preloads via bunfig.toml, this skill ensures Claude can assist in building robust, leak-free test environments with proper state management.

Key Features

Global test preloading and bunfig.toml configuration
21 GitHub stars
Mock management and environment variable isolation
Jest-compatible lifecycle hook implementation (beforeAll, afterAll, etc.)
Nested describe block execution logic and ordering
Asynchronous setup and teardown patterns for databases and servers

Use Cases

Configuring global preloads for shared test configurations and external service stubs across all test files.
Managing ephemeral test servers and API base URL configurations during the test lifecycle.
Setting up automated database migrations and transactional rollbacks for integration tests.

About

Key Features

Global test preloading and bunfig.toml configuration
21 GitHub stars
Mock management and environment variable isolation
Jest-compatible lifecycle hook implementation (beforeAll, afterAll, etc.)
Nested describe block execution logic and ordering
Asynchronous setup and teardown patterns for databases and servers

Use Cases

Configuring global preloads for shared test configurations and external service stubs across all test files.
Managing ephemeral test servers and API base URL configurations during the test lifecycle.
Setting up automated database migrations and transactional rollbacks for integration tests.