Tone.js/test/component/Meter.js

define(["Tone/component/Meter", "helper/Basic", "helper/Offline", "helper/Test",
	"Tone/signal/Signal", "helper/PassAudio", "Tone/type/Type",
	"Tone/component/Merge", "Tone/source/Oscillator", "helper/Supports"],
function(Meter, Basic, Offline, Test, Signal, PassAudio, Tone, Merge, Oscillator, Supports){
	describe("Meter", function(){

		Basic(Meter);

		context("Metering", function(){
			it("handles input and output connections", function(){
				var meter = new Meter();
				Test.connect(meter);
				meter.connect(Test);
				meter.dispose();
			});

			it("handles getter/setter as Object", function(){
				var meter = new Meter();
				var values = {
					"smoothing" : 0.2
				};
				meter.set(values);
				expect(meter.get().smoothing).to.equal(0.2);
				meter.dispose();
			});

			it("can be constructed with the smoothing", function(){
				var meter = new Meter(0.5);
				expect(meter.smoothing).to.equal(0.5);
				meter.dispose();
			});

			it("can be constructed with an object", function(){
				var meter = new Meter({
					"smoothing" : 0.3
				});
				expect(meter.smoothing).to.equal(0.3);
				meter.dispose();
			});

			it("passes the audio through", function(){
				var meter;
				return PassAudio(function(input){
					meter = new Meter();
					input.chain(meter, Tone.Master);
				});
			});
			
			if (Supports.ONLINE_TESTING){
		
				it("measures the rms incoming signal", function(done){
					var meter = new Meter();
					var signal = new Signal(1).connect(meter);
					setTimeout(function(){
						expect(meter.getValue()).to.be.closeTo(1, 0.05);
						meter.dispose();
						signal.dispose();
						done();
					}, 400);
				});

				it("can get the rms level of the incoming signal", function(done){
					var meter = new Meter();
					var osc = new Oscillator().connect(meter).start();
					osc.volume.value = -6;
					setTimeout(function(){
						expect(meter.getLevel()).to.be.closeTo(-9, 1);
						meter.dispose();
						osc.dispose();
						done();
					}, 400);
				});
			}
		});
	});
});