add test/tests/p5.Delay

test/tests/p5.Delay.js

@@ -0,0 +1,25 @@
+define(['chai'],
+  function(chai) {
+
+  var expect = chai.expect;
+
+  describe('p5.Delay', function() {
+
+    it('can be created and disposed', function() {
+      var delay = new p5.Delay();
+      delay.dispose();
+    });
+
+    it('has initial feedback value of 0.5', function(){
+      var delay = new p5.Delay();
+      expect(delay.feedback()).to.equal(0.5);
+    });
+
+    it('can set feedback', function(){
+      var delay = new p5.Delay();
+      delay.feedback(0.7);
+      expect(delay.feedback()).to.be.closeTo(0.7, 0.001);
+    });
+
+  });
+});