perfnow/test/spec/perfnow.spec.coffee

0.1 kb window.performance.now high resolution timer polyfill with Date fallback

###
@file

## Responsibilities
- unit test perfnow.coffee

Scaffolded with generator-microjs v0.1.2

@author Daniel Lamb <dlamb.open.source@gmail.com>
###

describe 'perfnow.coffee', ->
  beforeEach ->
    # add spies

  it 'should have a working test harness', ->
    # arrange
    # act
    # assert
    expect(true).not.toBe false

  it 'should set performance.now', ->
    # arrange
    # act
    # assert
    expect(typeof window.performance.now).toBe 'function'

  it 'should use now if is exists', ->
    # arrange
    win = performance:
      now: 'now'
    # act
    perfnow win
    # assert
    expect(win.performance.now).toBe 'now'

  it 'should use mozNow if is exists', ->
    # arrange
    win = performance:
      mozNow: 'mozNow'
    # act
    perfnow win
    # assert
    expect(win.performance.now).toBe 'mozNow'

  it 'should use msNow if is exists', ->
    # arrange
    win = performance:
      msNow: 'msNow'
    # act
    perfnow win
    # assert
    expect(win.performance.now).toBe 'msNow'

  it 'should use oNow if is exists', ->
    # arrange
    win = performance:
      oNow: 'oNow'
    # act
    perfnow win
    # assert
    expect(win.performance.now).toBe 'oNow'

  it 'should use webkitNow if is exists', ->
    # arrange
    win = performance:
      webkitNow: 'webkitNow'
    # act
    perfnow win
    # assert
    expect(win.performance.now).toBe 'webkitNow'

  it 'should fallback to Date if needed', ->
    # arrange
    win = {}
    jasmine.GlobalDate = window.Date
    MockDate = ->
      new jasmine.GlobalDate(0)
    MockDate:: = jasmine.GlobalDate::
    window.Date = MockDate
    # act
    perfnow win
    # assert
    expect(win.performance.now()).toBe 0
    # reset
    window.Date = jasmine.GlobalDate