NogginLessDom

A zero-dependency testing framework built on node:test and node:assert.

NogginLessDom is a comprehensive testing framework for Node.js that ships a full-featured test runner, assertion library, DOM simulation, mocking utilities, code coverage, snapshot testing, and dependency analysis -- all with zero runtime dependencies. Every algorithm is implemented from scratch using only Node.js built-in modules. No third-party code ships to consumers, eliminating the supply chain attack surface entirely.

v0.0.25 -- 80 source files, 28K+ lines of TypeScript, 3100+ tests.

Key Features

• Test Runner -- describe, it, test with skip, only, todo, concurrent, each, shuffle, retry, fails, skipIf, runIf, and full lifecycle hooks
• 30+ Assertions -- expect() with equality, truthiness, type, numeric, string, collection, exception, mock, and snapshot matchers plus .not, .resolves, .rejects modifiers
• DOM Simulation -- Document, Element, 29 typed HTML elements, 20 event types, Shadow DOM, Custom Elements, Observer APIs, SVG, Canvas, IndexedDB, Web Workers, WebSocket, and more
• Mocking -- fn(), spyOn(), module mocking, fake timers with full Date mocking, global/env stubbing, and async utilities
• Code Coverage -- V8 and Istanbul providers, 11 reporters, configurable thresholds, source map support, per-test tracking
• Dependency Analysis -- circular import detection, import depth analysis, unused import detection, dependency graph visualization
• Zero Dependencies -- empty dependencies in package.json, no transitive node_modules to audit

Quick Start

Install as a dev dependency:

bun add -d @asymmetric-effort/nogginlessdom

Create a test file (example.test.ts):

import { describe, it, expect } from '@asymmetric-effort/nogginlessdom';

describe('Math', () => {
  it('adds two numbers', () => {
    expect(1 + 2).toBe(3);
  });

  it('compares objects deeply', () => {
    expect({ a: 1, b: [2, 3] }).toEqual({ a: 1, b: [2, 3] });
  });

  it('checks exceptions', () => {
    expect(() => {
      throw new Error('oops');
    }).toThrow('oops');
  });
});

Run the tests:

bun test

DOM Testing

NogginLessDom includes a full DOM simulation. No separate DOM library needed.

import {
  describe,
  it,
  expect,
  Document,
  Event,
} from '@asymmetric-effort/nogginlessdom';

describe('DOM', () => {
  it('creates and queries elements', () => {
    const doc = new Document();
    const div = doc.createElement('div');
    div.id = 'app';
    div.className = 'container';

    const paragraph = doc.createElement('p');
    paragraph.textContent = 'Hello, world!';
    div.appendChild(paragraph);
    doc.appendChild(div);

    expect(doc.getElementById('app')).toBeDefined();
    expect(doc.querySelector('p')?.textContent).toBe('Hello, world!');
    expect(doc.querySelectorAll('.container')).toHaveLength(1);
  });

  it('handles events with bubbling', () => {
    const doc = new Document();
    const parent = doc.createElement('div');
    const button = doc.createElement('button');
    parent.appendChild(button);

    const clicks: string[] = [];
    parent.addEventListener('click', () => clicks.push('parent'));
    button.addEventListener('click', () => clicks.push('button'));

    button.dispatchEvent(new Event('click', { bubbles: true }));
    expect(clicks).toEqual(['button', 'parent']);
  });
});

Mocking

Create mock functions, spy on methods, and control time:

import {
  describe,
  it,
  expect,
  fn,
  spyOn,
  useFakeTimers,
  useRealTimers,
} from '@asymmetric-effort/nogginlessdom';

describe('Mocking', () => {
  it('tracks mock function calls', () => {
    const mockFn = fn((x: number) => x * 2);
    mockFn(3);
    mockFn(5);

    expect(mockFn).toHaveBeenCalledTimes(2);
    expect(mockFn).toHaveBeenCalledWith(3);
    expect(mockFn.mock.results[0]).toEqual({ type: 'return', value: 6 });
  });

  it('spies on object methods', () => {
    const obj = { greet: (name: string) => `Hello, ${name}` };
    const spy = spyOn(obj, 'greet');

    obj.greet('Alice');
    expect(spy).toHaveBeenCalledWith('Alice');
    spy.mockRestore();
  });

  it('controls fake timers', () => {
    const clock = useFakeTimers();
    const callback = fn();

    setTimeout(callback, 1000);
    expect(callback).not.toHaveBeenCalled();

    clock.advanceTimersByTime(1000);
    expect(callback).toHaveBeenCalledOnce();

    useRealTimers();
  });
});

Code Coverage

Enable coverage in bunfig.toml:

[test]
coverage = true
coverageThreshold = { line = 90, function = 90, statement = 90 }

Run tests with coverage:

bun test

Coverage data is collected automatically when enabled. The framework supports V8 and Istanbul providers with 11 output formats including text, HTML, LCOV, Cobertura, and more. See the Configuration Guide for full details.

Why NogginLessDom?

Zero Supply Chain Risk

The dependencies field in package.json is {}. When you install NogginLessDom, you get exactly one package with no transitive dependency tree. Package takeovers, typosquatting, and malicious updates in transitive dependencies cannot affect your test toolchain.

Built on Node.js Built-ins

The test runner wraps node:test. Assertions wrap node:assert. These are battle-tested modules maintained by the Node.js team, guaranteed to be available in every Node.js >= 20 environment. NogginLessDom adds a familiar API layer on top without reinventing core functionality.

Everything in One Package

Test runner, assertions, DOM simulation, mocking, coverage, snapshots, and dependency analysis -- all from a single import. No need to install and configure separate packages for each capability.

Security by Design

DOM parsing never uses eval(), new Function(), or dynamic code execution. HTML input is validated through deterministic parsing. Path operations include symlink protection and traversal validation.

Documentation

Full documentation is available in the docs/ directory:

• Getting Started -- Installation, first test, and core features walkthrough
• Installation -- All package managers, TypeScript setup, and verification
• Configuration -- Test patterns, coverage, reporters, dependency analysis, and environment variables
• Architecture -- Module structure, dependency graph, build pipeline, and security design
• API Reference -- Detailed documentation for every module

API Overview

| Module | Key Exports | Docs | | --------------- | ------------------------------------------------------------------------------ | ----------------------------------------- | | Test Runner | describe, it, test, lifecycle hooks, .each, .skip, .only, .retry | test-runner.md | | Assertions | expect() with 30+ matchers, .not, .resolves, .rejects | assertions.md | | DOM | Document, Element, 29 HTML elements, 20 event types, Window, Storage | dom.md | | Mocking | fn, spyOn, mock, vi, useFakeTimers, module mocking | mocking.md | | Coverage | V8 + Istanbul providers, 11 reporters, thresholds, per-test tracking | architecture.md | | Snapshots | toMatchSnapshot, toMatchInlineSnapshot, custom serializers | assertions.md |

Development

make setup          # Install dependencies and git hooks
make lint           # Run all linters (markdownlint, eslint, prettier, etc.)
make test           # Run unit, integration, and e2e tests
make build          # Clean build to build/

Requires Node.js >= 20.0.0.

Contributing

See CONTRIBUTING.md for development workflow, coding standards, and pull request guidelines.

Security

NogginLessDom has zero runtime dependencies, which eliminates the supply chain attack surface entirely. See SECURITY.md for our security policy and vulnerability reporting process.

License

MIT