Tone.js/test/core/Gain.js

define(["Test", "Tone/core/Gain", "Tone/core/Tone", "helper/PassAudio"], 
	function (Test, Gain, Tone, PassAudio) {

		describe("Gain", function(){

			it("can be created and disposed", function(){
				var gain = new Gain();
				gain.dispose();
				Test.wasDisposed(gain);
			});

			it("handles input and output connections", function(){
				var gain = new Gain();
				gain.connect(Test);
				Test.connect(gain);
				Test.connect(gain.gain);
				gain.dispose();
			});

			it("can set the gain value", function(){
				var gain = new Gain();
				gain.gain.value = 0.2;
				expect(gain.gain.value).to.be.closeTo(0.2, 0.001);
				gain.dispose();
			});

			it("can be constructed with options object", function(){

				var gain = new Gain({
					"gain" : 0.4
				});
				expect(gain.gain.value).to.be.closeTo(0.4, 0.001);
				gain.dispose();
			});

			it("can be constructed with an initial value", function(){
				var gain = new Gain(3);
				expect(gain.gain.value).to.be.closeTo(3, 0.001);
				gain.dispose();
			});

			it("can set the units", function(){
				var gain = new Gain(0, Tone.Type.Decibels);
				expect(gain.gain.value).to.be.closeTo(0, 0.001);
				expect(gain.gain.units).to.equal(Tone.Type.Decibels);
				gain.dispose();
			});

			it("can get the value using 'get'", function(){
				var gain = new Gain(5);
				var value = gain.get();
				expect(value.gain).to.be.closeTo(5, 0.001);
				gain.dispose();
			});

			it("can set the value using 'set'", function(){
				var gain = new Gain(5);
				gain.set("gain", 4);
				expect(gain.gain.value).to.be.closeTo(4, 0.001);
				gain.dispose();
			});

			it("passes audio through", function(){
				return PassAudio(function(input){
					var gain = new Gain().toMaster();
					input.connect(gain);
				});
			});		
		});
	});