Tone.js/test/source/PulseOscillator.js

import BasicTests from "helper/Basic";
import PulseOscillator from "Tone/source/PulseOscillator";
import Offline from "helper/Offline";
import SourceTests from "helper/SourceTests";
import OscillatorTests from "helper/OscillatorTests";
import CompareToFile from "helper/CompareToFile";

describe("PulseOscillator", function(){

	//run the common tests
	BasicTests(PulseOscillator);
	SourceTests(PulseOscillator);
	OscillatorTests(PulseOscillator);

	it("matches a file", function(){
		return CompareToFile(function(){
			var osc = new PulseOscillator().toMaster();
			osc.start(0);
		}, "pulseOscillator.wav", 0.03);
	});

	context("Phase Rotation", function(){
		it("can change the phase to 90", function(){
			return Offline(function(){
				var osc = new PulseOscillator({
					"phase" : 90,
					"frequency" : 1
				});
				osc.toMaster();
				osc.start(0);
			}, 1).then(function(buffer){
				buffer.forEach(function(sample, time){
					if (time < 0.25){
						expect(sample).to.be.within(-1, 0);
					} else if (time > 0.25 && time < 0.5){
						expect(sample).to.be.within(0, 1);
					}
				});
			});
		});

		it("can change the phase to -90", function(){
			return Offline(function(){
				var osc = new PulseOscillator({
					"phase" : 270,
					"frequency" : 1
				});
				osc.toMaster();
				osc.start(0);
			}, 1).then(function(buffer){
				buffer.forEach(function(sample, time){
					if (time < 0.25){
						expect(sample).to.be.within(0, 1);
					} else if (time > 0.25 && time < 0.5){
						expect(sample).to.be.within(-1, 0);
					}
				});
			});
		});

	});

	context("Width", function(){

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

		it("outputs correctly with a width of 0", function(){
			return Offline(function(){
				var osc = new PulseOscillator({
					"width" : 0,
					"frequency" : 1
				});
				osc.toMaster();
				osc.start(0);
			}, 0.9).then(function(buffer){
				buffer.forEach(function(sample, time){
					if (time > 0.51){
						expect(sample).to.be.within(-1, 0);
					}
				});
			});
		});

		it("outputs correctly with a width of 0.5", function(){
			return Offline(function(){
				var osc = new PulseOscillator({
					"width" : 0.5,
					"frequency" : 1
				});
				osc.toMaster();
				osc.start(0);
			}, 1).then(function(buffer){
				buffer.forEach(function(sample, time){
					if (time <= 0.5){
						expect(sample).to.be.within(0, 1);
					} else if (time >= 0.51 && time <= 0.7){
						expect(sample).to.be.within(-1, 0);
					} else if (time > 0.71){
						expect(sample).to.be.within(0, 1);
					}
				});
			});
		});
	});

	context("Types", function(){
		it("reports it's type", function(){
			var osc = new PulseOscillator();
			expect(osc.type).to.equal("pulse");
			expect(osc.baseType).to.equal("pulse");
			expect(osc.partials).to.deep.equal([]);
			osc.dispose();
		});
	});

});