1 files changed, 9 insertions, 0 deletions
diff --git a/dom/animation/test/css-transitions/file_setting-effect.html b/dom/animation/test/css-transitions/file_setting-effect.html
index c61877194e..81279ea554 100644
--- a/dom/animation/test/css-transitions/file_setting-effect.html
+++ b/dom/animation/test/css-transitions/file_setting-effect.html
@@ -7,6 +7,8 @@
 
 promise_test(function(t) {
   var div = addDiv(t);
+  var watcher = new EventWatcher(t, div, [ 'transitionend',
+                                           'transitioncancel' ]);
   div.style.left = '0px';
 
   div.style.transition = 'left 100s';
@@ -20,11 +22,14 @@ promise_test(function(t) {
     assert_equals(transition.transitionProperty, 'left');
     assert_equals(transition.playState, 'finished');
     assert_equals(window.getComputedStyle(div).left, '100px');
+    return watcher.wait_for('transitionend');
   });
 }, 'Test for removing a transition effect');
 
 promise_test(function(t) {
   var div = addDiv(t);
+  var watcher = new EventWatcher(t, div, [ 'transitionend',
+                                           'transitioncancel' ]);
   div.style.left = '0px';
 
   div.style.transition = 'left 100s';
@@ -46,6 +51,8 @@ promise_test(function(t) {
 
 promise_test(function(t) {
   var div = addDiv(t);
+  var watcher = new EventWatcher(t, div, [ 'transitionend',
+                                           'transitioncancel' ]);
   div.style.left = '0px';
   div.style.width = '0px';
 
@@ -65,6 +72,8 @@ promise_test(function(t) {
 
 promise_test(function(t) {
   var div = addDiv(t);
+  var watcher = new EventWatcher(t, div, [ 'transitionend',
+                                           'transitioncancel' ]);
   div.style.left = '0px';
   div.style.width = '0px';