Tone.js/test/signal/EqualPowerGain.js

define(["helper/Offline", "Tone/signal/EqualPowerGain", "helper/Basic", 
	"Test", "Tone/source/Oscillator", "Tone/signal/Signal", "helper/PassAudio", "Tone/core/Tone"], 
	function (Offline, EqualPowerGain, Basic, Test, Oscillator, Signal, PassAudio, Tone) {

	describe("EqualPowerGain", function(){

		Basic(EqualPowerGain);

		context("Equal Power Gain", function(){

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

			it ("passes audio through", function(){
				return PassAudio(function(input){
					var eqGain = new EqualPowerGain().toMaster();
					input.connect(eqGain);
				});
			});

			it("scales the input on an equal power scale", function(){
				var eqGain;
				return Offline(function(){
					var sig = new Signal(0);
					eqGain = new EqualPowerGain();
					sig.connect(eqGain);
					eqGain.toMaster();
					sig.setValueAtTime(0, 0);
					sig.linearRampToValueAtTime(1, 0.1);
				}, 0.1).then(function(buffer){
					buffer.forEach(function(sample, time){
						expect(sample).to.be.closeTo(Tone.equalPowerScale(time*10), 0.01);
					});
				});
			});
		});
	});
});