Tone.js/test/signal/Pow.js

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

	describe("Pow", function(){

		Basic(Pow);

		context("Exponential Scaling", function(){

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

			it("can do powers of 2", function(){
				return ConstantOutput(function(){
					var signal = new Signal(0.3);
					var pow = new Pow(2);
					signal.connect(pow);
					pow.toMaster();
				}, 0.09); 
			});

			it("can compute negative values and powers less than 1", function(){
				return ConstantOutput(function(){
					var signal = new Signal(-0.49);
					var pow = new Pow(0.5);
					signal.connect(pow);
					pow.toMaster();
				}, 0.7); 
			});

			it("can set a new exponent", function(){
				return ConstantOutput(function(){
					var signal = new Signal(0.5);
					var pow = new Pow(1);
					pow.value = 3;
					signal.connect(pow);
					pow.toMaster();
				}, 0.125); 
			});
		});
	});
});