Add method for retrieving ol.Overlay by id

test/spec/ol/overlay.test.js

@@ -1,6 +1,36 @@
 goog.provide('ol.test.Overlay');
 
 describe('ol.Overlay', function() {
+  var target, map;
+
+  var width = 360;
+  var height = 180;
+
+  beforeEach(function() {
+    target = document.createElement('div');
+
+    var style = target.style;
+    style.position = 'absolute';
+    style.left = '-1000px';
+    style.top = '-1000px';
+    style.width = width + 'px';
+    style.height = height + 'px';
+    document.body.appendChild(target);
+
+    map = new ol.Map({
+      target: target,
+      view: new ol.View({
+        projection: 'EPSG:4326',
+        center: [0, 0],
+        resolution: 1
+      })
+    });
+  });
+
+  afterEach(function() {
+    goog.dispose(map);
+    document.body.removeChild(target);
+  });
 
   describe('constructor', function() {
 
@@ -11,6 +41,39 @@ describe('ol.Overlay', function() {
 
   });
 
+  describe('#setId()', function() {
+    var overlay, target;
+
+    beforeEach(function() {
+      target = document.createElement('div');
+      overlay = new ol.Overlay({
+        element: target,
+        position: [0, 0]
+      });
+      map.addOverlay(overlay);
+    });
+    afterEach(function() {
+      map.removeOverlay(overlay);
+    });
+
+    it('sets the overlay identifier', function() {
+      expect(overlay.getId()).to.be(undefined);
+      overlay.setId('foo');
+      expect(overlay.getId()).to.be('foo');
+    });
+
+    it('accepts a string or number', function() {
+      overlay.setId('foo');
+      expect(overlay.getId()).to.be('foo');
+      overlay.setId(2);
+      expect(overlay.getId()).to.be(2);
+    });
+
+  });
+
 });
 
+goog.require('goog.dispose');
+goog.require('ol.Map');
 goog.require('ol.Overlay');
+goog.require('ol.View');