Tone.js/test/source/Noise.js

define(["helper/Basic", "Tone/source/Noise", "helper/SourceTests", "helper/OutputAudio", "helper/CompareToFile"],
	function(BasicTests, Noise, SourceTests, OutputAudio, CompareToFile) {

		describe("Noise", function(){

		//run the common tests
			BasicTests(Noise);
			SourceTests(Noise);

			it("matches a file", function(){
				return CompareToFile(function(){
					const noise = new Noise().toMaster();
					noise.start(0.1).stop(0.2);
				}, "noise.wav", 150);
			});

			context("Get/Set", function(){

				it("can be constructed with an options object", function(){
					var noise = new Noise({
						"type" : "brown"
					});
					expect(noise.type).to.equal("brown");
					noise.dispose();
				});

				it("can set the playbackRate in the constructor", function(){
					var noise = new Noise({
						"playbackRate" : 2
					});
					expect(noise.playbackRate).to.equal(2);
					noise.dispose();
				});

				it("can set the playbackRate after the noise is started", function(){
					return OutputAudio(function(){
						var noise = new Noise().toMaster();
						noise.start();
						noise.playbackRate = 3;
						expect(noise.playbackRate).to.equal(3);
					});
				});

			});

			context("Type", function(){

				it("can be set to 3 noise types", function(){
					var noise = new Noise();
					var types = ["white", "brown", "pink"];
					for (var i = 0; i < types.length; i++){
						noise.type = types[i];
						expect(noise.type).to.equal(types[i]);

					}
					noise.dispose();
				});

				it("cant set invalid type", function(){
					var noise = new Noise();
					expect(function(){
						noise.type = "else";
					}).to.throw(Error);
					noise.dispose();
				});

				it("outputs white noise", function(){
					return OutputAudio(function(){
						var noise = new Noise("white");
						noise.toMaster();
						noise.start();
					});
				});

				it("outputs pink noise", function(){
					return OutputAudio(function(){
						var noise = new Noise("pink");
						noise.toMaster();
						noise.start();
					});
				});

				it("outputs brown noise", function(){
					return OutputAudio(function(){
						var noise = new Noise("brown");
						noise.toMaster();
						noise.start();
					});
				});

				it("can set the type after the noise is started", function(){
					return OutputAudio(function(){
						var noise = new Noise();
						noise.toMaster();
						noise.start();
						noise.type = "brown";
					});
				});
			});
		});
	});