From e44ca944fe94ae455cd6dc45d9985a6d9fb94754 Mon Sep 17 00:00:00 2001
From: Tim Hartman <tbhartman@gmail.com>
Date: Wed, 29 Apr 2020 16:18:33 -0400
Subject: [PATCH] fix(client): flush resultsBuffer on engine upgrade (#3212)

Fixes #3211
---
 client/karma.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/client/karma.js b/client/karma.js
index edefcdb14..04715c059 100644
--- a/client/karma.js
+++ b/client/karma.js
@@ -288,6 +288,11 @@ function Karma (socket, iframe, opener, navigator, location, document) {
   socket.on('connect', function () {
     socket.io.engine.on('upgrade', function () {
       resultsBufferLimit = 1
+      // Flush any results which were buffered before the upgrade to WebSocket protocol.
+      if (resultsBuffer.length > 0) {
+        socket.emit('result', resultsBuffer)
+        resultsBuffer = []
+      }
     })
     var info = {
       name: navigator.userAgent,