From f0b11ad22ee0a3f98436f816de88a20c631d7c75 Mon Sep 17 00:00:00 2001
From: Andrey Lushnikov <aslushnikov@gmail.com>
Date: Thu, 4 Jan 2018 11:30:29 -0800
Subject: [PATCH] test: verify serialization of "undefined" fields (#1721)

Fixes #1510.
---
 test/test.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/test/test.js b/test/test.js
index 1febcc41..47f60eae 100644
--- a/test/test.js
+++ b/test/test.js
@@ -389,6 +389,9 @@ describe('Page', function() {
       const result = await page.evaluate((a, b) => Object.is(a, undefined) && Object.is(b, 'foo'), undefined, 'foo');
       expect(result).toBe(true);
     });
+    it('should properly serialize null fields', async({page}) => {
+      expect(await page.evaluate(() => ({a: undefined}))).toEqual({});
+    });
     it('should fail for window object', async({page, server}) => {
       const result = await page.evaluate(() => window);
       expect(result).toBe(undefined);