We don't have IE9 supports grid yet, completely didn't see this while refactoring.

test/unit/support.js

@@ -245,13 +245,15 @@ testIframeWithCallback( "A background on the testElement does not cause IE8 to c
 		};
 	}
 
+	if ( expected ) {
 		test("Verify that the support tests resolve as expected per browser", function() {
 			for ( var i in expected ) {
-			if ( jQuery.isAjax || i !== "ajax" && i !== "cors" ) {
+				if ( jQuery.ajax || i !== "ajax" && i !== "cors" ) {
 					equal( jQuery.support[i], expected[i], "jQuery.support['" + i + "']: " + jQuery.support[i] + ", expected['" + i + "']: " + expected[i]);
 				}
 			}
 		});
+	}
 
 })();