Writing & Running Tests in Bun
From the Bun cheat sheet · Test Runner · verified Jul 2026
Writing & Running Tests
Write Jest-compatible tests with describe, test, and expect
typescript
import { test, expect, describe } from "bun:test";
describe("math", () => {
test("addition", () => {
expect(2 + 2).toBe(4);
});
test("async", async () => {
const res = await fetch("https://api.example.com");
expect(res.ok).toBeTrue();
});
});💡 bun test is Jest-compatible — import from "bun:test" or keep existing Jest imports
⚡ Bun test runner is 10-40x faster than Jest with zero config for TypeScript
📌 Use test.skip() for tests not ready yet and test.todo() as a placeholder reminder
🟢 Run with bun test --watch to auto-rerun on file changes during development
testjestexpectdescribe
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