From 21eafbcdae6ebe6e928b0129ad9488e6c699e575 Mon Sep 17 00:00:00 2001
From: Dmitry Gozman <dgozman@gmail.com>
Date: Thu, 30 Jul 2020 16:49:58 -0700
Subject: [PATCH] test: unflake screenshot test (#3245)

---
 test/screenshot.jest.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/screenshot.jest.js b/test/screenshot.jest.js
index 17c3a9809d..9ec7be161e 100644
--- a/test/screenshot.jest.js
+++ b/test/screenshot.jest.js
@@ -541,7 +541,10 @@ describe.skip(ffheadful)('ElementHandle.screenshot', function() {
     await page.setViewportSize({ width: 500, height: 500 });
     await page.goto(server.PREFIX + '/grid.html');
     const elementHandle = await page.$('.box:nth-of-type(3)');
-    await elementHandle.evaluate(e => e.classList.add('animation'));
+    await elementHandle.evaluate(e => {
+      e.classList.add('animation');
+      return new Promise(f => requestAnimationFrame(() => requestAnimationFrame(f)));
+    });
     const screenshot = await elementHandle.screenshot();
     expect(screenshot).toBeGolden('screenshot-element-bounding-box.png');
   });