Tone.js/test/core/OfflineContext.js

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

		context("OfflineContext", function(){

			it("can be created an disposed", function(){
				var ctx = new OfflineContext(1, 0.1, 44100);
				return ctx.dispose().then(function(){
					Test.wasDisposed(ctx);
				});
			});

			it("is setup with 0 lookAhead and offline clockSource", function(){
				var ctx = new OfflineContext(1, 0.1, 44100);
				expect(ctx.lookAhead).to.equal(0);
				expect(ctx.clockSource).to.equal("offline");
				return ctx.dispose();
			});

			it("can render audio", function(){
				var ctx = new OfflineContext(1, 0.2, 44100);
				var osc = ctx.createOscillator();
				osc.connect(ctx.destination);
				osc.start(0.1);
				return ctx.render().then(function(buffer){
					expect(buffer).to.be.instanceOf(AudioBuffer);
					var array = buffer.getChannelData(0);
					for (var i = 0; i < array.length; i++){
						if (array[i] !== 0){
							expect(i/array.length).to.be.closeTo(0.5, 0.01);
							break;
						}
					}
				});
			});
		});
	});