Tone.js/test/core/Master.js

define(["helper/Test", "Tone/core/Master", "Tone/core/Tone", "helper/Offline", 
	"helper/PassAudio", "Tone/source/Oscillator", "Tone/core/AudioNode", "Tone/core/Gain"],
function(Test, Master, Tone, Offline, PassAudio, Oscillator, AudioNode, Gain){

	describe("Master", function(){
		it("exists", function(){
			expect(Tone.Master).to.exist;
		});

		it("provides a toMaster method", function(){
			expect(AudioNode.prototype.toMaster).is.a("function");
			var gain = new Gain();
			expect(gain.toMaster).is.a("function");
			gain.toMaster();
		});

		it("attaches itself to the context", function(){
			expect(Tone.context.master).equals(Tone.Master);
			expect(Tone.context.destination).equals(Tone.Master);
		});

		it("can be muted and unmuted", function(){
			Tone.Master.mute = false;
			expect(Tone.Master.mute).to.be.false;
			Tone.Master.mute = true;
			expect(Tone.Master.mute).to.be.true;
		});

		it("passes audio through", function(){
			return PassAudio(function(input){
				input.toMaster();
			});
		});

		it("passes no audio when muted", function(){
			return Offline(function(){
				new Oscillator().toMaster().start(0);
				Tone.Master.mute = true;
			}).then(function(buffer){
				expect(buffer.isSilent()).to.be.true;
			});
		});

		it("has a master volume control", function(){
			return Offline(function(){
				Tone.Master.volume.value = -20;
				expect(Tone.Master.volume.value).to.be.closeTo(-20, 0.1);
			});
		});

		it("can pass audio through chained nodes", function(){
			return PassAudio(function(input){
				var gain = Tone.context.createGain();
				input.connect(gain);
				Tone.Master.chain(gain);
			});
		});
	});
});