chai = require "chai"
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chai.use(require "chai-increasing")
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{assert,expect} = chai
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Bluebird = require "bluebird"
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now = require "../"
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getUptime = -> process.uptime() * 1e3
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describe "now", ->
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it "reported time differs at most 1ms from a freshly reported uptime", ->
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assert.isAtMost Math.abs(now()-getUptime()), 1
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it "two subsequent calls return an increasing number", ->
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assert.isBelow now(), now()
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it "has less than 10 microseconds overhead", ->
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assert.isBelow Math.abs(now() - now()), 0.010
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it "can be called 1 million times in under 1 second (averaging under 1 microsecond per call)", ->
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@timeout 1000
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now() for [0...1e6]
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undefined
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it "for 10,000 numbers, number n is never bigger than number n-1", ->
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stamps = (now() for [1...10000])
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expect(stamps).to.be.increasing
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it "shows that at least 0.2 ms has passed after a timeout of 1 ms", ->
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earlier = now()
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Bluebird.resolve().delay(1).then -> assert.isAbove (now()-earlier), 0.2
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it "shows that at most 3 ms has passed after a timeout of 1 ms", ->
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earlier = now()
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Bluebird.resolve().delay(1).then -> assert.isBelow (now()-earlier), 3
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it "shows that at least 190ms ms has passed after a timeout of 200ms", ->
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earlier = now()
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Bluebird.resolve().delay(200).then -> assert.isAbove (now()-earlier), 190
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it "shows that at most 220 ms has passed after a timeout of 200ms", ->
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earlier = now()
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Bluebird.resolve().delay(200).then -> assert.isBelow (now()-earlier), 220
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