Avoid side-effects when calling jQuery.hasData

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/test/unit/data.js b/test/unit/data.js
index d813ec82d..2f9c25ed5 100644
--- a/test/unit/data.js
+++ b/test/unit/data.js
@@ -51,6 +51,17 @@ test( "jQuery._data & _removeData, expected returns", function() {
 	);
 });
 
+test( "jQuery.hasData no side effects", function() {
+	expect(1);
+	var obj = {};
+
+	jQuery.hasData( obj );
+
+	equal( Object.getOwnPropertyNames( obj ).length, 0,
+		"No data expandos where added when calling jQuery.hasData(o)"
+	);
+});
+
 function dataTests (elem) {
 	var oldCacheLength, dataObj, internalDataObj, expected, actual;