Preview:
test('adds 1 + 2 to equal 3', () => {
    expect(sum(1, 2)).toBe(3);
});

test('object assignment', () => {
  const data = {one: 1};
  data['two'] = 2;
  expect(data).toEqual({one: 1, two: 2});
});

`toBeNull matches only null
toBeUndefined matches only undefined
toBeDefined is the opposite of toBeUndefined
toBeTruthy matches anything that an if statement treats as true
toBeFalsy matches anything that an if statement treats as false`
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter