# HG changeset patch
# User Tooru Fujisawa <arai_a@mac.com>
# Date 1516919414 -32400
# Node ID 5decaeffb7c0a5af6ec788809b21b83009cbc8f9
# Parent  cd18711b6b1fb1dec6823e16772c376d545dbc79
Bug 1430442 - Part 2: Wait for the next event tick after node-highlight event to leave MicroTask checkpoint for the mouse event in devtools/client/inspector/boxmodel/test/browser_boxmodel_guides.js r=pbro

diff --git a/devtools/client/inspector/boxmodel/test/browser_boxmodel_guides.js b/devtools/client/inspector/boxmodel/test/browser_boxmodel_guides.js
--- a/devtools/client/inspector/boxmodel/test/browser_boxmodel_guides.js
+++ b/devtools/client/inspector/boxmodel/test/browser_boxmodel_guides.js
@@ -44,13 +44,17 @@ add_task(async function () {
 async function testGuideOnLayoutHover(elt, expectedRegion, inspector) {
   info("Synthesizing mouseover on the boxmodel-view");
   EventUtils.synthesizeMouse(elt, 2, 2, {type: "mouseover"},
     elt.ownerDocument.defaultView);
 
   info("Waiting for the node-highlight event from the toolbox");
   await inspector.toolbox.once("node-highlight");
 
+  // Wait for the next event tick to make sure the remaining part of the
+  // test is executed after finishing synthesizing mouse event.
+  await new Promise(executeSoon);
+
   is(highlightedNodeFront, inspector.selection.nodeFront,
     "The right nodeFront was highlighted");
   is(highlighterOptions.region, expectedRegion,
     "Region " + expectedRegion + " was highlighted");
 }