jQuery.extend(true, Object, Object) copies objects with length keys correctly

1 files changed, 7 insertions, 1 deletions

diff --git a/test/unit/core.js b/test/unit/core.js
index 347864eaf..fe2e992a8 100644
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -435,7 +435,7 @@ test("jQuery.merge()", function() {
 });
 
 test("jQuery.extend(Object, Object)", function() {
-	expect(20);
+	expect(21);
 
 	var settings = { xnumber1: 5, xnumber2: 7, xstring1: "peter", xstring2: "pan" },
 		options = { xnumber2: 1, xstring2: "x", xxx: "newstring" },
@@ -460,6 +460,12 @@ test("jQuery.extend(Object, Object)", function() {
 	isObj( deep2.foo, deep2copy.foo, "Check if not deep2: options must not be modified" );
 	equals( deep1.foo2, document, "Make sure that a deep clone was not attempted on the document" );
 
+	var empty = {};
+	var optionsWithLength = { foo: { length: -1 } };
+	jQuery.extend(true, empty, optionsWithLength);
+
+	isObj( empty.foo, optionsWithLength.foo, "The length property must copy correctly" );
+
 	var nullUndef;
 	nullUndef = jQuery.extend({}, options, { xnumber2: null });
 	ok( nullUndef.xnumber2 === null, "Check to make sure null values are copied");