Tone.js/test/core/Draw.js

define(["Test", "Tone/core/Draw", "Tone/core/Tone", "helper/Supports"],
	function (Test, Draw, Tone, Supports) {

		describe("Draw", function(){

			if (Supports.ONLINE_TESTING){
			
				it("can schedule a callback at a AudioContext time", function(done){
					var scheduledTime = Tone.now() + 0.2;
					Draw.schedule(function(){
						expect(Tone.now()).to.be.closeTo(scheduledTime, 0.05);
						done();
					}, scheduledTime);
				});

				it("can schedule multiple callbacks", function(done){
					var callbackCount = 0;
					var firstEvent = Tone.now() + 0.1;
					Draw.schedule(function(){
						callbackCount++;
						expect(Tone.now()).to.be.closeTo(firstEvent, 0.05);
					}, firstEvent);

					var thirdEvent = Tone.now() + 0.3;
					Draw.schedule(function(){
						callbackCount++;
						expect(Tone.now()).to.be.closeTo(thirdEvent, 0.05);
						expect(callbackCount).to.equal(3);
						done();
					}, thirdEvent);

					var secondEvent = Tone.now() + 0.2;
					Draw.schedule(function(){
						callbackCount++;
						expect(Tone.now()).to.be.closeTo(secondEvent, 0.05);
					}, secondEvent);
				});

				it("can cancel scheduled events", function(done){
					var callbackCount = 0;
					Draw.schedule(function(){
						callbackCount++;
					}, Tone.now() + 0.1);

					Draw.schedule(function(){
						throw new Error("should not call this method");
					}, Tone.now() + 0.2);

					Draw.schedule(function(){
						throw new Error("should not call this method");
					}, Tone.now() + 0.25);

					//cancel the second and third events
					Draw.cancel(Tone.now() + 0.15);

					//schedule another one after
					Draw.schedule(function(){
						callbackCount++;
						expect(callbackCount).to.equal(2);
						done();
					}, Tone.now() + 0.3);

				});
			}

		});
	});