Tone.js/test/component/MidSideSplit.js

define(["Tone/component/MidSideSplit", "Tone/component/MidSideMerge", "helper/Basic", "Tone/signal/Signal", "helper/PassAudioStereo", 
	"Test", "helper/Offline", "Tone/component/Merge"], 
function (MidSideSplit, MidSideMerge, Basic, Signal, PassAudioStereo, Test, Offline, Merge) {

	describe("MidSideSplit", function(){

		Basic(MidSideSplit);

		context("Splitting", function(){

			it("handles inputs and outputs", function(){
				var split = new MidSideSplit();
				Test.connect(split);
				split.mid.connect(Test);
				split.side.connect(Test);
				split.dispose();
			});

			it("mid is if both L and R are the same", function(){
				return Offline(function(){
					var split = new MidSideSplit();
					split.mid.toMaster();
					var merge = new Merge().connect(split);
					new Signal(0.5).connect(merge.left);
					new Signal(0.5).connect(merge.right);
				}).then(function(buffer){
					expect(buffer.min()).to.be.closeTo(0.707, 0.01);
					expect(buffer.max()).to.be.closeTo(0.707, 0.01);
				});
			});

			it("side is 0 if both L and R are the same", function(){
				return Offline(function(){
					var split = new MidSideSplit();
					split.side.toMaster();
					var merge = new Merge().connect(split);
					new Signal(0.5).connect(merge.left);
					new Signal(0.5).connect(merge.right);
				}).then(function(buffer){
					expect(buffer.min()).to.be.closeTo(0, 0.01);
					expect(buffer.max()).to.be.closeTo(0, 0.01);
				});
			});

			it("mid is 0 if both L and R opposites", function(){
				return Offline(function(){
					var split = new MidSideSplit();
					split.mid.toMaster();
					var merge = new Merge().connect(split);
					new Signal(-1).connect(merge.left);
					new Signal(1).connect(merge.right);
				}).then(function(buffer){
					expect(buffer.min()).to.be.closeTo(0, 0.01);
					expect(buffer.max()).to.be.closeTo(0, 0.01);
				});
			});

			it("can decompose and reconstruct a signal", function(){
				return Offline(function(){
					var midSideMerge = new MidSideMerge().toMaster();
					var split = new MidSideSplit();
					split.mid.connect(midSideMerge.mid);
					split.side.connect(midSideMerge.side);
					var merge = new Merge().connect(split);
					new Signal(0.2).connect(merge.left);
					new Signal(0.4).connect(merge.right);
				}, 0.1, 2).then(function(buffer){
					buffer.forEach(function(l, r){
						expect(l).to.be.closeTo(0.2, 0.01);
						expect(r).to.be.closeTo(0.4, 0.01);
					});
				});
			});
		});
	});
});