Bun Test

Sets up Bun's built-in test runner with Jest-compatible APIs, so you can write unit, integration, and snapshot tests without adding dependencies. The skill walks through creating test directories, configuring bunfig.toml, writing tests with describe/expect blocks, and setting up mocks and spies. Includes a Jest migration guide since the syntax is nearly identical (just swap imports from @jest/globals to bun:test). The 3-10x speed improvement over Jest is real and noticeable on larger test suites. Good for new Bun projects or migrating existing Jest setups. Covers the basics well, though the advanced mocking patterns require checking the reference docs.

skills.sh installs: 228
GitHub stars: 4
last updated: Aug 21, 2026

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Install

$ npx -y skills add daleseo/bun-skills --skill bun-test --agent claude-code

Installs into .claude/skills of the current project.

Files

Bun Test Configuration

Set up Bun's built-in test runner with Jest-compatible APIs and significantly faster execution (3-10x faster than Jest).

Quick Reference

For detailed patterns, see:

Jest Migration: jest-migration.md - Complete Jest to Bun migration guide
Mocking: mocking.md - Mock functions, spies, module mocking
Examples: examples.md - Test patterns for APIs, databases, async code

Core Workflow

1. Check Prerequisites

# Verify Bun installation
bun --version

# Check if project exists
ls -la package.json

2. Determine Testing Needs

Ask the user what type of testing they need:

Unit Testing: Test individual functions and modules
Integration Testing: Test component interactions
API Testing: Test HTTP endpoints
Snapshot Testing: Test output consistency

3. Create Test Directory Structure

# Create test directories
mkdir -p tests/{unit,integration,fixtures}

SKILL.md on GitHub

Details

Repository: github.com/daleseo/bun-skills
Categories: Testing & QA, Documentation, Cloud & Infrastructure
First seen: Jun 3, 2026