define(["Tone/effect/Tremolo", "helper/Basic", "helper/EffectTests", "helper/Offline"],
	function (Tremolo, Basic, EffectTests, Offline) {

		describe("Tremolo", function(){
			Basic(Tremolo);
			EffectTests(Tremolo);

			context("API", function(){

				it("can pass in options in the constructor", function(){
					var tremolo = new Tremolo({
						"depth" : 0.2,
						"type" : "sawtooth",
						"spread" : 160,
					});
					expect(tremolo.depth.value).to.be.closeTo(0.2, 0.001);
					expect(tremolo.type).to.equal("sawtooth");
					expect(tremolo.spread).to.equal(160);
					tremolo.dispose();
				});

				it("can be started and stopped", function(){
					var tremolo = new Tremolo();
					tremolo.start().stop("+0.2");
					tremolo.dispose();
				});

				it("can get/set the options", function(){
					var tremolo = new Tremolo();
					tremolo.set({
						"frequency" : 2.4,
						"type" : "triangle"
					});
					expect(tremolo.get().frequency).to.be.closeTo(2.4, 0.01);
					expect(tremolo.get().type).to.equal("triangle");
					tremolo.dispose();
				});

				it("can set the frequency and depth", function(){
					var tremolo = new Tremolo();
					tremolo.depth.value = 0.4;
					tremolo.frequency.value = 0.4;
					expect(tremolo.depth.value).to.be.closeTo(0.4, 0.01);
					expect(tremolo.frequency.value).to.be.closeTo(0.4, 0.01);
					tremolo.dispose();
				});

				it("can sync the frequency to the Transport", function(){

					return Offline(function(Transport){
						var tremolo = new Tremolo(2);
						tremolo.sync();
						tremolo.frequency.toMaster();
						Transport.bpm.setValueAtTime(Transport.bpm.value * 2, 0.05);
					// Transport.start(0)
					}, 0.1).then(function(buffer){
						expect(buffer.getValueAtTime(0)).to.be.closeTo(2, 0.1);
						expect(buffer.getValueAtTime(0.05)).to.be.closeTo(4, 0.1);
					});
				});

				it("can unsync the frequency to the Transport", function(){

					return Offline(function(Transport){
						var tremolo = new Tremolo(2);
						tremolo.sync();
						tremolo.frequency.toMaster();
						Transport.bpm.setValueAtTime(Transport.bpm.value * 2, 0.05);
						tremolo.unsync();
					}, 0.1).then(function(buffer){
						expect(buffer.getValueAtTime(0)).to.be.closeTo(2, 0.1);
						expect(buffer.getValueAtTime(0.05)).to.be.closeTo(2, 0.1);
					});
				});
			});
		});
	});