Tone.js/test/effect/Reverb.js

import Reverb from "Tone/effect/Reverb";
import Basic from "helper/Basic";
import Offline from "helper/Offline";
import Oscillator from "Tone/source/Oscillator";

describe("Reverb", function(){

	Basic(Reverb);

	context("API", function(){

		it("can pass in options in the constructor", function(){
			var reverb = new Reverb({
				"decay" : 2,
				"preDelay" : 0.1
			});
			expect(reverb.decay).to.be.closeTo(2, 0.001);
			expect(reverb.preDelay).to.be.closeTo(0.1, 0.001);
			reverb.dispose();
		});

		it("can get/set the options", function(){
			var reverb = new Reverb();
			reverb.set({
				"decay" : 0.4,
			});
			expect(reverb.get().decay).to.be.closeTo(0.4, 0.001);
			reverb.dispose();
		});

		it("can generate an IR", function(){
			var reverb = new Reverb();
			var promise = reverb.generate();
			expect(promise).to.have.property("then");
			return promise.then(function(){
				reverb.dispose();
			});
		});

		it("is silent before the reverb is generated", function(){
			return Offline(function(){
				var osc = new Oscillator();
				osc.start(0).stop(0.1);
				var reverb = new Reverb(0.2).toMaster();
				osc.connect(reverb);
			}).then(function(buffer){
				expect(buffer.isSilent()).to.be.true;
			});
		});

		it("passes audio from input to output", function(){
			return Offline(function(){
				var osc = new Oscillator();
				osc.start(0).stop(0.1);
				var reverb = new Reverb(0.2).toMaster();
				osc.connect(reverb);
				return reverb.generate();
			}, 0.3).then(function(buffer){
				expect(buffer.getRmsAtTime(0.05)).to.be.greaterThan(0);
				expect(buffer.getRmsAtTime(0.1)).to.be.greaterThan(0);
				expect(buffer.getRmsAtTime(0.2)).to.be.greaterThan(0);
			});
		});
	});
});