Tone.js/test/component/FrequencyEnvelope.js

import FrequencyEnvelope from "Tone/component/FrequencyEnvelope";
import Basic from "helper/Basic";
import Offline from "helper/Offline";
import Test from "helper/Test";
import Envelope from "Tone/component/Envelope";
describe("FrequencyEnvelope", function(){

	Basic(FrequencyEnvelope);

	context("FrequencyEnvelope", function(){

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

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

		it("can get and set values an Objects", function(){
			var env = new FrequencyEnvelope();
			var values = {
				"attack" : 0,
				"release" : "4n",
				"baseFrequency" : 20,
				"octaves" : 4
			};
			env.set(values);
			expect(env.get()).to.contain.keys(Object.keys(values));
			expect(env.baseFrequency).to.equal(20);
			expect(env.octaves).to.equal(4);
			env.dispose();
		});

		it("can take parameters as both an object and as arguments", function(){
			var env0 = new FrequencyEnvelope({
				"attack" : 0,
				"decay" : 0.5,
				"sustain" : 1,
				"exponent" : 3
			});
			expect(env0.attack).to.equal(0);
			expect(env0.decay).to.equal(0.5);
			expect(env0.sustain).to.equal(1);
			expect(env0.exponent).to.equal(3);
			env0.dispose();
			var env1 = new FrequencyEnvelope(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 e = {
				attack : 0.01,
				decay : 0.4,
				sustain : 1
			};
			return Offline(function(){
				var env = new FrequencyEnvelope(e.attack, e.decay, e.sustain);
				env.baseFrequency = 200;
				env.octaves = 3;
				env.attackCurve = "exponential";
				env.toMaster();
				env.triggerAttack(0);
			}, 0.3).then(function(buffer){
				buffer.forEach(function(sample, time){
					if (time < e.attack){
						expect(sample).to.be.within(200, 1600);
					} else if (time < e.attack + e.decay){
						expect(sample).to.be.closeTo(1600, 10);
					}
				});
			});
		});
	});
});