Tone.js/test/component/ScaledEnvelope.js

import ScaledEnvelope from "Tone/component/ScaledEnvelope";
import Basic from "helper/Basic";
import Offline from "helper/Offline";
import Test from "helper/Test";
import Envelope from "Tone/component/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,
				"exponent" : 3
			};
			env.set(values);
			expect(env.get()).to.contain.keys(Object.keys(values));
			expect(env.min).to.equal(2);
			expect(env.max).to.equal(4);
			expect(env.exponent).to.equal(3);
			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);
					} 
				});
			});
		});
	});
});