1 files changed, 2 insertions, 0 deletions
diff --git a/dom/tests/mochitest/general/window_storagePermissions.html b/dom/tests/mochitest/general/window_storagePermissions.html
index 3bab23c13b..92078f2fcc 100644
--- a/dom/tests/mochitest/general/window_storagePermissions.html
+++ b/dom/tests/mochitest/general/window_storagePermissions.html
@@ -25,6 +25,8 @@ onmessage = e => {
     let runnable = eval(runnableStr); // eslint-disable-line no-eval
     runnable.call(this).then(_ => {
       opener.postMessage({ type: "finish" }, "*");
+    }).catch(e => {
+      ok(false, e.data);
     });
 
     return;