Tone.js/test/component/ScaledEnvelope.js

define(["Tone/component/ScaledEnvelope", "helper/Basic", "helper/Offline", "Test", "Tone/component/Envelope"], 
function (ScaledEnvelope, Basic, Offline, Test, Envelope) {
	describe("ScaledEnvelope", function(){

		Basic(ScaledEnvelope);

		context("ScaledEnvelope", function(){


			it("has an output connections", function(){
				var env = new ScaledEnvelope();
				env.connect(Test);
				env.dispose();
			});

			it ("extends Envelope", function(){
				var env = new ScaledEnvelope();
				expect(env).to.be.instanceOf(Envelope);
				env.dispose();
			});

			it ("can get and set values an Objects", function(){
				var env = new ScaledEnvelope();
				var values = {
					"attack" : 0,
					"release" : "4n",
					"min" : 2,
					"max" : 4
				};
				env.set(values);
				expect(env.get()).to.contain.keys(Object.keys(values));
				expect(env.min).to.equal(2);
				expect(env.max).to.equal(4);
				env.dispose();
			});

			it ("can take parameters as both an object and as arguments", function(){
				var env0 = new ScaledEnvelope({
					"attack" : 0,
					"decay" : 0.5,
					"sustain" : 1
				});
				expect(env0.attack).to.equal(0);
				expect(env0.decay).to.equal(0.5);
				expect(env0.sustain).to.equal(1);
				env0.dispose();
				var env1 = new ScaledEnvelope(0.1, 0.2, 0.3);
				expect(env1.attack).to.equal(0.1);
				expect(env1.decay).to.equal(0.2);
				expect(env1.sustain).to.equal(0.3);
				env1.dispose();
			});


			it ("goes to the scaled range", function(){
				var env;
				return Offline(function(){
					env = new ScaledEnvelope(0.01, 0.4, 1);
					env.min = 5;
					env.max = 10;
					env.attackCurve = "exponential";
					env.toMaster();
					env.triggerAttack(0);
				}, 0.3).then(function(buffer){
					buffer.forEach(function(sample, time){
						if (time < env.attack){
							expect(sample).to.be.within(5, 10);
						} else if (time < env.attack + env.decay){
							expect(sample).to.be.closeTo(10, 0.1);
						} 
					});
				});
			});
		});
	});
});