Fix f860e0bd Firefox failures

(cherry picked from commit 0a3a424e65f66414305bf6a34fc6fd93d3b61c62)

diff --git a/test/unit/event.js b/test/unit/event.js
index 182e10b1a3227fac25c7e8378bfa2c88393eb714..041920a533e9c202ad0ca42bf1bc75580317dd23 100644 (file)
--- a/test/unit/event.js
+++ b/test/unit/event.js
@@ -1234,7 +1234,7 @@ test(".trigger() doesn't bubble load event (#10717)", function() {
 test("Delegated events in SVG (#10791; #13180)", function() {
        expect(2);
 
-       var e,
+       var instanceRoot, e,
                svg = jQuery(
                        "<svg height='1' version='1.1' width='1' xmlns='http://www.w3.org/2000/svg'>" +
                        "<defs><rect id='ref' x='10' y='20' width='100' height='60' r='10' rx='10' ry='10'></rect></defs>" +
@@ -1258,10 +1258,11 @@ test("Delegated events in SVG (#10791; #13180)", function() {
 
        // Fire a native click on an SVGElementInstance (the instance tree of an SVG <use>)
        // to confirm that it doesn't break our event delegation handling (#13180)
-       if ( document.createEvent ) {
+       instanceRoot = svg.find("#use")[0].instanceRoot;
+       if ( instanceRoot && document.createEvent ) {
                e = document.createEvent("MouseEvents");
                e.initEvent( "click", true, true );
-               svg.find("#use")[0].instanceRoot.dispatchEvent( e );
+               instanceRoot.dispatchEvent( e );
        }
 
        jQuery("#qunit-fixture").off("click");