Tone.js/test/core/Draw.js

define(["helper/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.context.currentTime).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.context.currentTime).to.be.closeTo(firstEvent, 0.05);
				}, firstEvent);

				var thirdEvent = Tone.now() + 0.3;
				Draw.schedule(function(){
					callbackCount++;
					expect(Tone.context.currentTime).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.context.currentTime).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);

			});
		}

	});
});