Testing with Tape and jsdom global.

helpers.js

import tape from 'tape';
import jsdom from 'jsdom-global';

export function test (description, fn, { html } = {}) {
    tape(description, t => {
        const cleanup = jsdom(html);
        fn(t);
        cleanup();
    });
}

tape-jsdom-global.js

import { test } from './helpers';
import jsdom from 'jsdom-global';

// init jsdom before all tests
jsdom();

test('truthy', assert => {
  assert.ok(true);
  assert.end();
});

test('dom', assert => {
    assert.equal(window, window);
    assert.end();
});

test('paragraph', assert => {
    assert.equal(document.querySelector('p'), null, 'should be null');
    assert.end();
});

test('document', assert => {
    assert.notEqual(document, null, 'should not be null');
    assert.end();
});

test('elements', assert => {
    const actual = document.querySelector('p');
    const expected = 'Hello';

    assert.notEqual(actual , null);
    assert.equal(actual.innerHTML, expected);
    assert.end();
}, { html: '<p>Hello</p>' });

test('elements', assert => {
    assert.equal(document.querySelector('p'), null);
    assert.end();
});