restructured unit tests and created a unit test build target which concatenates source test files

tests/js/unit/ddTests.js

@@ -0,0 +1,59 @@
+Test.Modules.DD = {
+    'test drag and drop properties and methods': function(containerId) {
+        var stage = new Kinetic.Stage({
+            container: containerId,
+            width: 578,
+            height: 200
+        });
+        var layer = new Kinetic.Layer();
+        var circle = new Kinetic.Circle({
+            x: stage.getWidth() / 2,
+            y: stage.getHeight() / 2,
+            radius: 70,
+            fill: 'green',
+            stroke: 'black',
+            strokeWidth: 4,
+            name: 'myCircle'
+        });
+
+        stage.add(layer);
+        layer.add(circle);
+        layer.draw();
+
+        // test defaults
+        test(circle.attrs.draggable === false, 'draggable should be false');
+
+        //change properties
+        circle.setDraggable(true);
+
+        // test new properties
+        test(circle.attrs.draggable === true, 'draggable should be true');
+    },
+    'DRAG AND DROP - multiple drag and drop sets with setDraggable()': function(containerId) {
+        var stage = new Kinetic.Stage({
+            container: containerId,
+            width: 578,
+            height: 200
+        });
+        var layer = new Kinetic.Layer();
+        var circle = new Kinetic.Circle({
+            x: 380,
+            y: stage.getHeight() / 2,
+            radius: 70,
+            strokeWidth: 4,
+            fill: 'red',
+            stroke: 'black'
+        });
+
+        circle.setDraggable(true);
+        test(circle.getDraggable(), 'draggable should be true');
+        circle.setDraggable(true);
+        test(circle.getDraggable(), 'draggable should be true');
+        circle.setDraggable(false);
+        test(!circle.getDraggable(), 'draggable should be false');
+
+        layer.add(circle);
+        stage.add(layer);
+
+    }
+};