Tone.js/test/helper/SourceTests.js

define(["helper/OutputAudio", "Tone/source/Source", "helper/OutputAudioStereo", 
	"Test", "helper/Offline", "helper/APITest"], 
	function (OutputAudio, Source, OutputAudioStereo, Test, Offline, APITest) {

	return function(Constr, args){

		context("Source Tests", function(){

			it ("extends Tone.Source", function(){
				var instance = new Constr(args);
				expect(instance).to.be.an.instanceof(Source);
				instance.dispose();
			});

			it ("can connect the output", function(){
				var instance = new Constr(args);
				instance.connect(Test);
				instance.dispose();
			});

			it("starts and stops", function(){
				return Offline(function(){
					var instance = new Constr(args);
					expect(instance.state).to.equal("stopped");
					instance.start(0).stop(0.2);
					return function(time){
						if (time >= 0 && time < 0.2){
							expect(instance.state).to.equal("started");
						} else if (time > 0.2){
							expect(instance.state).to.equal("stopped");
						}
					};
				}, 0.3);
			});

			it("makes a sound", function(){
				return OutputAudio(function(){
					var instance = new Constr(args);
					instance.toMaster();
					instance.start();
				});
			});	

			it("produces sound in both channels", function(){
				return OutputAudioStereo(function(){
					var instance = new Constr(args);
					instance.toMaster();
					instance.start();
				});
			});	

			it("be scheduled to start in the future", function(){
				return Offline(function(){
					var instance = new Constr(args).toMaster();
					instance.start(0.1);
				}, 0.3).then(function(buffer){
					buffer.forEach(function(sample, time){
						if (sample > 0){
							expect(time).to.be.at.least(0.099);
						}
					});
				});
			});

			it("makes no sound if it is started and then stopped with a time at or before the start time", function(){
				return Offline(function(){
					var instance = new Constr(args).toMaster();
					instance.start(0.1).stop(0.05);
				}, 0.3).then(function(buffer){
					expect(buffer.isSilent()).to.be.true;
				});
			});

			it("can be muted", function(){
				return Offline(function(){
					var instance = new Constr(args).toMaster();
					instance.start(0);
					instance.mute = true;
				}, 0.3).then(function(buffer){
					expect(buffer.isSilent()).to.be.true;
				});
			});

			it("be scheduled to stop in the future", function(){
				return Offline(function(){
					var instance = new Constr(args).toMaster();
					instance.start(0).stop(0.2);
				}, 0.3).then(function(buffer){
					buffer.forEach(function(sample, time){
						if (time > 0.2){
							expect(sample).to.equal(0);
						}
					});
				});
			});

		});

		context("Source API", function(){
			APITest.method(Constr, "start", ["Time=", "Time=", "Time="], args);
			APITest.method(Constr, "stop", ["Time="], args);
		});

	};
});