Tone.js/test/signal/SchedulableSignal.js

define(["Test", "Tone/signal/SchedulableSignal", "Offline"], function (Test, SchedulableSignal, Offline) {

	describe("SchedulableSignal", function(){

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

		it("can schedule a change in the future", function(){
			var sched = new SchedulableSignal(1);
			sched.setValueAtTime(2, 0.2);
			sched.dispose();
		});

		it("can schedule a ramp in the future", function(){
			var sched = new SchedulableSignal(1);
			sched.setValueAtTime(2, 0);
			sched.linearRampToValueAtTime(0.1, 0.2);
			sched.exponentialRampToValueAtTime(1, 0.4);
			sched.setTargetAtTime(0.5, 0.45, 1);
			sched.dispose();
		});

		it("can get a setValueAtTime value in the future", function(){
			var sched = new SchedulableSignal(1);
			sched.setValueAtTime(0, 0);
			sched.setValueAtTime(1, 1);
			sched.setValueAtTime(2, 2);
			sched.setValueAtTime(3, 3);
			expect(sched._getValueAtTime(0)).to.equal(0);
			expect(sched._getValueAtTime(1)).to.equal(1);
			expect(sched._getValueAtTime(1.1)).to.equal(1);
			expect(sched._getValueAtTime(2)).to.equal(2);
			expect(sched._getValueAtTime(3)).to.equal(3);
			expect(sched._getValueAtTime(4)).to.equal(3);
			sched.dispose();
		});

		it("can get linear ramp value in the future", function(){
			var sched = new SchedulableSignal(1);
			sched.setValueAtTime(0, 0);
			sched.linearRampToValueAtTime(1, 1);
			sched.linearRampToValueAtTime(0, 2);
			expect(sched._getValueAtTime(0)).to.equal(0);
			expect(sched._getValueAtTime(0.5)).to.equal(0.5);
			expect(sched._getValueAtTime(1)).to.equal(1);
			expect(sched._getValueAtTime(1.5)).to.equal(0.5);
			expect(sched._getValueAtTime(2)).to.equal(0);
			sched.dispose();
		});

		it("can get exponential ramp value in the future", function(done){
			var sched;
			var offline = new Offline(2);
			offline.before(function(dest){
				sched = new SchedulableSignal().connect(dest);
				sched.setValueAtTime(0.5, 0);
				sched.exponentialRampToValueAtTime(1, 1);
				sched.exponentialRampToValueAtTime(0.5, 2);
			});
			offline.test(function(sample, time){
				expect(sample).to.be.closeTo(sched._getValueAtTime(time), 0.001);
			});
			offline.after(function(){
				sched.dispose();
				done();
			});
			offline.run();
		});

		it("can get set target value in the future", function(done){
			var sched;
			var offline = new Offline(2);
			offline.before(function(dest){
				sched = new SchedulableSignal(1).connect(dest);
				sched.setValueAtTime(3, 0);
				sched.setTargetAtTime(0.5, 0.5, 2);
			});
			offline.test(function(sample, time){
				expect(sample).to.be.closeTo(sched._getValueAtTime(time), 0.001);
			});
			offline.after(function(){
				sched.dispose();
				done();
			});
			offline.run();
		});

		it("can match a complex scheduled curve", function(done){
			var sched;
			var offline = new Offline(4);
			offline.before(function(dest){
				sched = new SchedulableSignal(1).connect(dest);
				sched.setValueAtTime(0.2, 0.3);
				sched.setTargetAtTime(0.5, 0.5, 2);
				sched.setValueAtTime(0.4, 1);
				sched.linearRampToValueAtTime(5, 1.4);
				sched.exponentialRampToValueAtTime(2, 1.6);
				sched.setValueAtTime(2.5, 2);
				sched.linearRampToValueAtTime(2.4, 2.5);
				sched.linearRampToValueAtTime(5, 3);
				sched.setTargetAtTime(2, 3.5, 5);
			});
			offline.test(function(sample, time){
				expect(sample).to.be.closeTo(sched._getValueAtTime(time), 0.001);
			});
			offline.after(function(){
				sched.dispose();
				done();
			});
			offline.run();
		});

		it("can schedule a linear ramp between two times", function(){
			var sched = new SchedulableSignal(0);
			sched.linearRampToValueBetween(1, 1, 2);
			expect(sched._getValueAtTime(0)).to.equal(0);
			expect(sched._getValueAtTime(0.5)).to.equal(0);
			expect(sched._getValueAtTime(1)).to.equal(0);
			expect(sched._getValueAtTime(1.5)).to.equal(0.5);
			expect(sched._getValueAtTime(2)).to.equal(1);
		});

		it("can get exponential ramp value between two times", function(done){
			var sched;
			var offline = new Offline(2);
			offline.before(function(dest){
				sched = new SchedulableSignal(1).connect(dest);
				sched.linearRampToValueBetween(3, 1, 2);
			});
			offline.test(function(sample, time){
				expect(sample).to.be.closeTo(sched._getValueAtTime(time), 0.001);
			});
			offline.after(function(){
				sched.dispose();
				done();
			});
			offline.run();
		});
	});
});