Tests

Writing tests

describe('A suite', () => {
  it('works', () => {
    expect(true).toBe(true)
  })
})

Note: This cheatsheet may be a little outdated. Also see the Jest cheatsheet. Jest uses Jasmine, and therefore has similar API.

Expectations

expect(true).toBe(true)
expect(true).not.toBe(true)

expect(a).toEqual(bar)

expect(message).toMatch(/bar/)
expect(message).toMatch('bar')

expect(a.foo).toBeDefined()
expect(a.foo).toBeUndefined()
expect(a.foo).toBeNull()

expect(a.foo).toBeTruthy()
expect(a.foo).toBeFalsy()

expect(message).toContain('hello')

expect(pi).toBeGreaterThan(3)
expect(pi).toBeLessThan(4)
expect(pi).toBeCloseTo(3.1415, 0.1)

expect(func).toThrow()

Hooks

beforeEach(() => {
  ···
})

afterEach(() => {
  ···
})

Pending

xit('this is a pending test', () => {
  ···
})

xdescribe('this is a pending block', () => {
  ···
})

Spies

spyOn(foo, 'setBar')
spyOn(foo, 'setBar').andReturn(123)
spyOn(foo, 'getBar').andCallFake(function() { return 1001; })
foo.setBar(123)

expect(foo.setBar).toHaveBeenCalled()
expect(foo.setBar).toHaveBeenCalledWith(123)
expect(foo.setBar.calls.length).toEqual(2)
expect(foo.setBar.calls[0].args[0]).toEqual(123)

Creating spies

stub = jasmine.createSpy('stub')
stub('hello')

expect(stub.identity).toEqual('stub')
expect(stub).toHaveBeenCalled()

Async

test('works with promises', () => {
  return new Promise((resolve, reject) => {
    ···
  })
})

Make your test return a promise.

HTML runner

var jasmineEnv = jasmine.getEnv()
jasmineEnv.updateInterval = 250

var htmlReporter = new jasmine.HtmlReporter()
jasmineEnv.addReporter(htmlReporter)

$(function() { jasmineEnv.execute() })

Jasmine jQuery

Expectations

expect($('#id')).toBe('div')
expect($('input[type=checkbox]')).toBeChecked()
expect($('input[type=checkbox]')).toBeDisabled()
expect($('input[type=checkbox]')).toBeFocused()
expect($('#menu ul')).toBeEmpty()

expect($('#toolbar')).toBeHidden()
expect($('#toolbar')).toBeVisible()

expect($('#popup')).toHaveCss({ margin: "10px" })
expect($('option')).toBeSelected()

expect($('.foo')).toExist()

expect($('a')).toHaveAttr('rel')
expect($('a')).toHaveAttr('rel', 'nofollow')

expect($('a')).toHaveClass('rel')
expect($('a')).toHaveId('home')

expect($('a')).toHaveHtml('<span></span>')
expect($('a')).toContainHtml('<span></span>')
expect($('a')).toHaveText('hi')

expect($form).toHandle('submit') // event
expect($form).toHandleWith('submit', onSumbit)

See: jasmine-jquery

Event spies

spyOnEvent($('#some_element'), 'click')
$('#some_element').click()
expect('click').toHaveBeenPreventedOn($('#some_element'))
expect('click').toHaveBeenTriggeredOn($('#some_element'))

References