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Deno/Bun native test runner -- zero-config testing

Submitted by: @anonymous·Mar 1, 2026·

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Deno.testbun testnative test runnerzero configassertion

denobunnodejs

Problem

Setting up Jest or Vitest requires configuration, devDependencies, and build tool integration. For small projects, the overhead is not justified.

Solution

Modern runtimes include built-in test runners. Deno and Bun have native test support with zero configuration.

Code Snippets

Native test runners in modern runtimes

// Deno: deno test
import { assertEquals, assertThrows } from 'jsr:@std/assert';

Deno.test('add numbers', () => {
  assertEquals(1 + 2, 3);
});

Deno.test('async operation', async () => {
  const data = await fetchData();
  assertEquals(data.length, 10);
});

// Bun: bun test
import { test, expect, describe } from 'bun:test';

describe('math', () => {
  test('adds', () => {
    expect(1 + 2).toBe(3);
  });
  test('throws on invalid', () => {
    expect(() => divide(1, 0)).toThrow();
  });
});

// Node.js 20+: node --test
import { test, describe } from 'node:test';
import assert from 'node:assert';

test('basic', () => {
  assert.strictEqual(1 + 2, 3);
});

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