Make geometries event targets

Previously, the tests were using eql to make assertions about matching geometries.  This is inappropriate for structures with circular references (as with goog.events.EventTarget);

test/spec/ol/geom/geometry.test.js

@@ -0,0 +1,37 @@
+goog.provide('ol.test.geom.Geometry');
+
+describe('ol.geom.Geometry', function() {
+
+  describe('constructor', function() {
+    it('creates a new geometry', function() {
+      var geom = new ol.geom.Geometry();
+      expect(geom).to.be.a(ol.geom.Geometry);
+      expect(geom).to.be.a(goog.events.EventTarget);
+    });
+  });
+
+});
+
+describe('ol.geom.GeometryEvent', function() {
+
+  describe('constructor', function() {
+
+    it('creates a new event', function() {
+      var point = new ol.geom.Point([1, 2]);
+      var bounds = point.getBounds();
+      var evt = new ol.geom.GeometryEvent('change', point, bounds);
+      expect(evt).to.be.a(ol.geom.GeometryEvent);
+      expect(evt).to.be.a(goog.events.Event);
+      expect(evt.target).to.be(point);
+      expect(evt.oldExtent).to.be(bounds);
+    });
+
+  });
+
+});
+
+goog.require('goog.events.Event');
+goog.require('goog.events.EventTarget');
+goog.require('ol.geom.Geometry');
+goog.require('ol.geom.GeometryEvent');
+goog.require('ol.geom.Point');