Tone.js/test/component/Analyser.js

define(["Tone/component/Analyser", "helper/Test", "helper/Basic", "Tone/source/Noise"],
	function(Analyser, Test, Basic, Noise){

		describe("Analyser", function(){

			Basic(Analyser);

			it("handles input connection", function(){
				var anl = new Analyser();
				Test.connect(anl);
				anl.dispose();
			});

			it("can get and set properties", function(){
				var anl = new Analyser();
				anl.set({
					"size" : 32,
					"smoothing" : 0.2
				});
				var values = anl.get();
				expect(values.size).to.equal(32);
				expect(values.smoothing).to.equal(0.2);
				anl.dispose();
			});

			it("can correctly set the size", function(){
				var anl = new Analyser("fft", 512);
				expect(anl.size).to.equal(512);
				anl.size = 1024;
				expect(anl.size).to.equal(1024);
				anl.dispose();
			});

			it("can run fft analysis", function(){
				var anl = new Analyser("fft", 512);
				analysis = anl.getValue();
				expect(analysis.length).to.equal(512);
				for (i = 0; i < analysis.length; i++){
					expect(analysis[i]).is.lessThan(0);
				}
				anl.dispose();
			});

			it("can run waveform analysis", function(done){
				var noise = new Noise();
				var anl = new Analyser("waveform", 256);
				noise.connect(anl);
				noise.start();

				setTimeout(function(){
					analysis = anl.getValue();
					expect(analysis.length).to.equal(256);
					for (i = 0; i < analysis.length; i++){
						expect(analysis[i]).is.within(-1, 1);
					}
					anl.dispose();
					noise.dispose();
					done();
				}, 300);
			});

			it("throws an error if an invalid type is set", function(){
				var anl = new Analyser("fft", 512);
				expect(function(){
					anl.type = "invalid";
				}).to.throw(Error);
				anl.dispose();
			});

		});
	});