Tone.js/test/core/Gain.js

import Test from "helper/Test";
import Gain from "Tone/core/Gain";
import Tone from "Tone/core/Tone";
import PassAudio from "helper/PassAudio";
import Basic from "helper/Basic";

describe("Gain", function(){

	Basic(Gain);

	it("can be created and disposed", function(){
		var gain = new Gain();
		gain.dispose();
		Test.wasDisposed(gain);
	});

	it("handles input and output connections", function(){
		var gain = new Gain();
		gain.connect(Test);
		Test.connect(gain);
		Test.connect(gain.gain);
		gain.dispose();
	});

	it("can set the gain value", function(){
		var gain = new Gain();
		gain.gain.value = 0.2;
		expect(gain.gain.value).to.be.closeTo(0.2, 0.001);
		gain.dispose();
	});

	it("can be constructed with options object", function(){

		var gain = new Gain({
			"gain" : 0.4
		});
		expect(gain.gain.value).to.be.closeTo(0.4, 0.001);
		gain.dispose();
	});

	it("can be constructed with an initial value", function(){
		var gain = new Gain(3);
		expect(gain.gain.value).to.be.closeTo(3, 0.001);
		gain.dispose();
	});

	it("can set the units", function(){
		var gain = new Gain(0, Tone.Type.Decibels);
		expect(gain.gain.value).to.be.closeTo(0, 0.001);
		expect(gain.gain.units).to.equal(Tone.Type.Decibels);
		gain.dispose();
	});

	it("can get the value using 'get'", function(){
		var gain = new Gain(5);
		var value = gain.get();
		expect(value.gain).to.be.closeTo(5, 0.001);
		gain.dispose();
	});

	it("can set the value using 'set'", function(){
		var gain = new Gain(5);
		gain.set("gain", 4);
		expect(gain.gain.value).to.be.closeTo(4, 0.001);
		gain.dispose();
	});

	it("passes audio through", function(){
		return PassAudio(function(input){
			var gain = new Gain().toMaster();
			input.connect(gain);
		});
	});		
});