dynatrace-cordova-outsystems-plugin/node_modules/performance-now/test/performance-now.coffee

This plugin gives you the ability to use the Dynatrace instrumentation in your hybrid application (Cordova, Ionic, ..). It uses the Mobile Agent, the JavaScript Agent and the Javascript Bridge. The Mobile Agent will give you all device specific values con

chai = require "chai"
chai.use(require "chai-increasing")
{assert,expect} = chai
Bluebird = require "bluebird"

now = require "../"

getUptime = -> process.uptime() * 1e3

describe "now", ->
  it "reported time differs at most 1ms from a freshly reported uptime", ->
    assert.isAtMost Math.abs(now()-getUptime()), 1

  it "two subsequent calls return an increasing number", ->
    assert.isBelow now(), now()

  it "has less than 10 microseconds overhead", ->
    assert.isBelow Math.abs(now() - now()), 0.010

  it "can be called 1 million times in under 1 second (averaging under 1 microsecond per call)", ->
    @timeout 1000
    now() for [0...1e6]
    undefined

  it "for 10,000 numbers, number n is never bigger than number n-1", ->
    stamps = (now() for [1...10000])
    expect(stamps).to.be.increasing

  it "shows that at least 0.2 ms has passed after a timeout of 1 ms", ->
    earlier = now()
    Bluebird.resolve().delay(1).then -> assert.isAbove (now()-earlier), 0.2

  it "shows that at most 3 ms has passed after a timeout of 1 ms", ->
    earlier = now()
    Bluebird.resolve().delay(1).then -> assert.isBelow (now()-earlier), 3

  it "shows that at least 190ms ms has passed after a timeout of 200ms", ->
    earlier = now()
    Bluebird.resolve().delay(200).then -> assert.isAbove (now()-earlier), 190

  it "shows that at most 220 ms has passed after a timeout of 200ms", ->
    earlier = now()
    Bluebird.resolve().delay(200).then -> assert.isBelow (now()-earlier), 220