Core: add unit test for isPlainObject(Symbol)

Fixes #2645
Closes #2661
(cherry picked from commit 9090d98439f8dc449beafee98f8ff35cfb4f9116)

diff --git a/test/unit/core.js b/test/unit/core.js
index e8202accd1a0a4e15649096b780ccf08c2277a32..a08ecf0c125d949d099e80a478ebb98865691c4d 100644 (file)
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -355,6 +355,15 @@ QUnit.asyncTest( "isPlainObject", function( assert ) {
        }
 } );
 
+//
+QUnit[ typeof Symbol === "function" ? "test" : "skip" ]( "isPlainObject(Symbol)", function( assert ) {
+       assert.expect( 2 );
+
+       assert.equal( jQuery.isPlainObject( Symbol() ), false, "Symbol" );
+       assert.equal( jQuery.isPlainObject( Object( Symbol() ) ), false, "Symbol inside an object" );
+} );
+
+
 QUnit.test( "isFunction", function( assert ) {
        assert.expect( 19 );