Add basic test for ol.Overlay

test/spec/ol/overlay.test.js

@@ -0,0 +1,16 @@
+goog.provide('ol.test.Overlay');
+
+describe('ol.Overlay', function() {
+
+  describe('constructor', function() {
+
+    it('can be constructed with minimal arguments', function() {
+      var instance = new ol.Overlay({});
+      expect(instance).to.be.an(ol.Overlay);
+    });
+
+  });
+
+});
+
+goog.require('ol.Overlay');