Tone.js/test/signal/Add.js

define(["helper/ConstantOutput", "helper/Basic", "Tone/signal/Add", "Tone/signal/Signal", "Test"], 
	function (ConstantOutput, Basic, Add, Signal, Test) {
		describe("Add", function(){

			Basic(Add);

			context("Addition", function(){

				it("handles input and output connections", function(){
					var add = new Add();
					Test.connect(add);
					Test.connect(add, 0);
					Test.connect(add, 1);
					add.connect(Test);
					add.dispose();
				});

				it("correctly sums a signal and a number", function(){
					return ConstantOutput(function(){
						var signal = new Signal(0);
						var adder = new Add(3);
						signal.connect(adder);
						adder.toMaster();
					}, 3);
				});

				it("can handle negative values", function(){
					return ConstantOutput(function(){
						var signal = new Signal(10);
						var adder = new Add(-1);
						signal.connect(adder);
						adder.toMaster();
					}, 9);
				});

				it("can sum two signals", function(){
					return ConstantOutput(function(){
						var sigA = new Signal(1);
						var sigB = new Signal(4);
						var adder = new Add();
						sigA.connect(adder, 0, 0);
						sigB.connect(adder, 0, 1);
						adder.toMaster();
					}, 5);
				});
			});
		});
	});