Tone.js/test/component/Follower.js

define(["Tone/component/Follower", "helper/Basic", "helper/Offline", "helper/Test",
	"Tone/signal/Signal", "helper/PassAudio", "helper/PassAudioStereo"],
function(Follower, Basic, Offline, Test, Signal, PassAudio, PassAudioStereo){
	describe("Follower", function(){

		Basic(Follower);

		context("Envelope Following", function(){

			it("handles input and output connections", function(){
				var follower = new Follower();
				Test.connect(follower);
				follower.connect(Test);
				follower.dispose();
			});

			it("handles getter/setter as Object", function(){
				var foll = new Follower();
				var values = {
					"smoothing" : 0.2,
				};
				foll.set(values);
				expect(foll.get()).to.have.keys(["smoothing"]);
				expect(foll.get().smoothing).to.be.closeTo(0.2, 0.001);
				foll.dispose();
			});

			it("can be constructed with an object", function(){
				var follower = new Follower({
					"smoothing" : 0.5,
				});
				expect(follower.smoothing).to.be.closeTo(0.5, 0.001);
				follower.dispose();
			});

			it("smoothes the incoming signal at 0.1", function(){
				return Offline(function(){
					var foll = new Follower(0.1).toMaster();
					var sig = new Signal(0);
					sig.connect(foll);
					sig.setValueAtTime(1, 0.1);
					sig.setValueAtTime(0, 0.3);
				}, 0.41).then(function(buffer){
					expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
					expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0.0, 0.01);
					expect(buffer.getValueAtTime(0.15)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.2)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.3)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.35)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.4)).to.be.closeTo(0, 0.2);
				});
			});

			it("smoothes the incoming signal at 0.05", function(){
				return Offline(function(){
					var foll = new Follower(0.05).toMaster();
					var sig = new Signal(0);
					sig.connect(foll);
					sig.setValueAtTime(1, 0.1);
					sig.setValueAtTime(0, 0.3);
				}, 0.41).then(function(buffer){
					expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
					expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0.0, 0.01);
					expect(buffer.getValueAtTime(0.125)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.15)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.3)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.325)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.35)).to.be.closeTo(0, 0.2);
				});
			});

			it("smoothes the incoming signal at 0.2", function(){
				return Offline(function(){
					var foll = new Follower(0.2).toMaster();
					var sig = new Signal(0);
					sig.connect(foll);
					sig.setValueAtTime(1, 0.1);
					sig.setValueAtTime(0, 0.3);
				}, 0.51).then(function(buffer){
					expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
					expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0.0, 0.01);
					expect(buffer.getValueAtTime(0.2)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.3)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.4)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.5)).to.be.closeTo(0, 0.2);
				});
			});

			/*it("smoothes the incoming signal at 0.5", function(){
				return Offline(function(){
					var foll = new Follower(0.5).toMaster();
					var sig = new Signal(0);
					sig.connect(foll);
					sig.setValueAtTime(1, 0.1);
					sig.setValueAtTime(0, 0.6);
				}, 1.11).then(function(buffer){
					expect(buffer.getValueAtTime(0)).to.be.closeTo(0, 0.01);
					expect(buffer.getValueAtTime(0.1)).to.be.closeTo(0.0, 0.01);
					expect(buffer.getValueAtTime(0.35)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(0.6)).to.be.closeTo(1, 0.2);
					expect(buffer.getValueAtTime(0.85)).to.be.closeTo(0.5, 0.2);
					expect(buffer.getValueAtTime(1.1)).to.be.closeTo(0, 0.2);
				});
			});*/

			it("passes the incoming signal through", function(){
				var follower;
				return PassAudio(function(input){
					follower = new Follower().toMaster();
					input.connect(follower);
				});
			});

		});
	});
});