Tone.js/test/signal/Normalize.js

define(["helper/ConstantOutput", "Tone/signal/Normalize", "helper/Basic", 
	"Test", "Tone/source/Oscillator", "Tone/signal/Signal", "helper/Offline"], 
	function (ConstantOutput, Normalize, Basic, Test, Oscillator, Signal, Offline) {

	describe("Normalize", function(){

		Basic(Normalize);

		context("Normalizing", function(){

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

			it("normalizes an oscillator to 0,1", function(){
				return Offline(function(){
					var osc = new Oscillator(1000);
					var norm = new Normalize(-1, 1);
					osc.connect(norm);
					norm.toMaster();
				}).then(function(buffer){
					buffer.forEach(function(sample){
						expect(sample).to.be.within(0, 1);
					});
				});
			});

			it("normalizes an input at the max range to 1", function(){
				return ConstantOutput(function(){
					var sig = new Signal(1000);
					var norm = new Normalize(0, 1000);
					sig.connect(norm);
					norm.toMaster();
				}, 1); 
			});

			it("normalizes an input at the min range to 0", function(){
				return ConstantOutput(function(){
					var sig = new Signal(-10);
					var norm = new Normalize(-10, 1000);
					sig.connect(norm);
					norm.toMaster();
				}, 0); 
			});

			it("can set the min and max", function(){
				return ConstantOutput(function(){
					var sig = new Signal(10);
					var norm = new Normalize(0, 1);
					norm.min = 5;
					norm.max = 15;
					expect(norm.min).to.be.closeTo(5, 0.1);
					expect(norm.max).to.be.closeTo(15, 0.1);
					sig.connect(norm);
					norm.toMaster();
				}, 0.5); 
			});
		});
	});
});