From 550613ba9c9fa489b6c3120e440749987fd65267 Mon Sep 17 00:00:00 2001
From: Ruben de Gooijer <rubendegooijer@gmail.com>
Date: Thu, 20 Sep 2018 10:59:32 +0200
Subject: [PATCH] Use more robust Array instance check

Improve robustness of Array type check.
---
 lib/test.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/test.js b/lib/test.js
index 6ad9c890..f87a3273 100644
--- a/lib/test.js
+++ b/lib/test.js
@@ -236,7 +236,7 @@ Test.prototype._assertHeader = function(header, res) {
 
   if (typeof actual === 'undefined') return new Error('expected "' + field + '" header field');
   // This check handles header values that may be a String or single element Array
-  if ((actual instanceof Array && actual.toString() === fieldExpected)
+  if ((Array.isArray(actual) && actual.toString() === fieldExpected)
     || fieldExpected === actual) {
     return;
   }