Core: restore enumeration behavior in isPlainObject

Fixes gh-2968
Close gh-2970

diff --git a/test/unit/core.js b/test/unit/core.js
index a0cf715cf30b0a4db937165302ec0647e3b4f677..97fc031d970c88d4c9d63068b641c218be9cca00 100644 (file)
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -328,13 +328,21 @@ QUnit.test( "type for `Symbol`", function( assert ) {
 } );
 
 QUnit.asyncTest( "isPlainObject", function( assert ) {
-       assert.expect( 16 );
+       assert.expect( 20 );
 
-       var pass, iframe, doc,
+       var pass, iframe, doc, parentObj, childObj, deep,
                fn = function() {};
 
        // The use case that we want to match
        assert.ok( jQuery.isPlainObject( {} ), "{}" );
+       assert.ok( jQuery.isPlainObject( new window.Object() ), "new Object" );
+
+       parentObj = { foo: "bar" };
+       childObj = Object.create( parentObj );
+
+       assert.ok( !jQuery.isPlainObject( childObj ), "isPlainObject(Object.create({}))" );
+       childObj.bar = "foo";
+       assert.ok( !jQuery.isPlainObject( childObj ), "isPlainObject(Object.create({}))" );
 
        // Not objects shouldn't be matched
        assert.ok( !jQuery.isPlainObject( "" ), "string" );
@@ -372,6 +380,10 @@ QUnit.asyncTest( "isPlainObject", function( assert ) {
 
        assert.ok( !jQuery.isPlainObject( new fn() ), "fn (inherited and own properties)" );
 
+       // Deep object
+       deep = { "foo": { "baz": true }, "foo2": document };
+       assert.ok( jQuery.isPlainObject( deep ), "Object with objects is still plain" );
+
        // DOM Element
        assert.ok( !jQuery.isPlainObject( document.createElement( "div" ) ), "DOM Element" );