Bun Test Has a Free API That Runs Jest-Compatible Tests 10x Faster

Bun’s built-in test runner: zero config, Jest-compatible, 10x faster.

import { describe, it, expect, mock } from 'bun:test'

describe('math', () => {
  it('adds', () => expect(1 + 1).toBe(2))
})

const fn = mock(() => 42)
fn()
expect(fn).toHaveBeenCalled()

bun test  # that's it

Jest 8.5s vs Vitest 3.2s vs Bun 0.8s for 1000 tests.

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