Fix ol.Collection#push return value

src/ol/collection.js

@@ -145,13 +145,13 @@ ol.Collection.prototype.pop = function() {
 /**
  * Insert the provided element at the end of the collection.
  * @param {T} elem Element.
- * @return {number} Length.
+ * @return {number} New length of the collection.
  * @api stable
  */
 ol.Collection.prototype.push = function(elem) {
-  var n = this.array_.length;
+  var n = this.getLength();
   this.insertAt(n, elem);
-  return n;
+  return this.getLength();
 };
 
 

test/spec/ol/collection.test.js

@@ -31,11 +31,23 @@ describe('ol.collection', function() {
 
   describe('push to a collection', function() {
     it('adds elements to the collection', function() {
-      collection.push(1);
-      expect(collection.getLength()).to.eql(1);
+      var length = collection.push(1);
+      expect(collection.getLength()).to.eql(length);
       expect(collection.getArray()).to.eql([1]);
       expect(collection.item(0)).to.eql(1);
     });
+    it('returns the correct new length of the collection', function() {
+      var length;
+      ol.events.listen(collection, 'add', function(event) {
+        if (event.element === 'remove_me') {
+          collection.remove(event.element);
+        }
+      });
+      length = collection.push('keep_me');
+      expect(collection.getLength()).to.eql(length);
+      length = collection.push('remove_me');
+      expect(collection.getLength()).to.eql(length);
+    });
   });
 
   describe('pop from a collection', function() {
@@ -236,8 +248,8 @@ describe('ol.collection', function() {
       ol.events.listen(collection, ol.Collection.EventType.ADD, function(e) {
         elem = e.element;
       });
-      collection.push(1);
-      expect(elem).to.eql(1);
+      var length = collection.push(1);
+      expect(elem).to.eql(length);
     });
   });