Tone.js/test/signal/Negate.js

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

	describe("Negate", function(){

		Basic(Negate);

		context("Negating", function(){

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

			it("negateates a positive value", function(){
				return ConstantOutput(function(){
					var signal = new Signal(1);
					var negate = new Negate();
					signal.connect(negate);
					negate.toMaster();
				}, -1);
			});

			it("makes a negateative value positive", function(){
				return ConstantOutput(function(){
					var signal = new Signal(-10);
					var negate = new Negate();
					signal.connect(negate);
					negate.toMaster();
				}, 10);
			});			
		});
	});
});