90 lines
1.5 KiB
JavaScript
90 lines
1.5 KiB
JavaScript
"use strict"
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var o = require("../../ospec/ospec")
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var callAsync = require("../../test-utils/callAsync")
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var throttle = require("../../api/throttle")
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o.spec("throttle", function() {
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var FRAME_BUDGET = Math.floor(1000 / 60)
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var spy, throttled
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o.beforeEach(function() {
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spy = o.spy()
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throttled = throttle(spy)
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})
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o("runs first call synchronously", function() {
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throttled()
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o(spy.callCount).equals(1)
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})
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o("throttles subsequent synchronous calls", function(done) {
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throttled()
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throttled()
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o(spy.callCount).equals(1)
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setTimeout(function() {
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o(spy.callCount).equals(2)
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done()
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}, FRAME_BUDGET) //this delay is much higher than 16.6ms due to setTimeout clamp and other runtime costs
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})
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o("calls after threshold", function(done) {
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throttled()
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o(spy.callCount).equals(1)
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setTimeout(function(t) {
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throttled()
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o(spy.callCount).equals(2)
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done()
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}, FRAME_BUDGET)
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})
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o("throttles before threshold", function(done) {
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throttled()
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o(spy.callCount).equals(1)
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callAsync(function(t) {
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throttled()
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o(spy.callCount).equals(1)
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done()
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})
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})
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o("it only runs once per tick", function(done) {
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throttled()
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throttled()
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throttled()
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o(spy.callCount).equals(1)
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setTimeout(function() {
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o(spy.callCount).equals(2)
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done()
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}, FRAME_BUDGET)
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})
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o("it supports forcing a synchronous redraw", function(done) {
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throttled()
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throttled()
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throttled(true)
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o(spy.callCount).equals(2)
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setTimeout(function() {
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o(spy.callCount).equals(3)
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done()
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}, FRAME_BUDGET)
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})
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})
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