test: add more test

Author: FGRibreau

README.md

@@ -4,7 +4,7 @@
 
 ------------------------------------------------
 
-[![Build Status](https://img.shields.io/circleci/project/github/FGRibreau/node-request-retry.svg)](https://circleci.com/gh/FGRibreau/node-request-retry/) [![Coverage Status](https://img.shields.io/coveralls/FGRibreau/node-request-retry/master.svg)](https://coveralls.io/github/FGRibreau/node-request-retry?branch=master) [![NPM version](https://img.shields.io/npm/v/requestretry.svg)](http://badge.fury.io/js/requestretry) [![Downloads](http://img.shields.io/npm/dm/requestretry.svg)](https://www.npmjs.com/package/requestretry)
+[![Coverage Status](https://img.shields.io/coveralls/FGRibreau/node-request-retry/master.svg)](https://coveralls.io/github/FGRibreau/node-request-retry?branch=master) [![NPM version](https://img.shields.io/npm/v/requestretry.svg)](http://badge.fury.io/js/requestretry) [![Downloads](http://img.shields.io/npm/dm/requestretry.svg)](https://www.npmjs.com/package/requestretry)
 
 [![Get help on Codementor](https://cdn.codementor.io/badges/get_help_github.svg)](https://www.codementor.io/francois-guillaume-ribreau?utm_source=github&utm_medium=button&utm_term=francois-guillaume-ribreau&utm_campaign=github)  [![available-for-advisory](https://img.shields.io/badge/available%20for%20consulting%20advisory-yes-ff69b4.svg?)](http://bit.ly/2c7uFJq) ![extra](https://img.shields.io/badge/actively%20maintained-yes-ff69b4.svg) [![Slack](https://img.shields.io/badge/Slack-Join%20our%20tech%20community-17202A?logo=slack)](https://join.slack.com/t/fgribreau/shared_invite/zt-edpjwt2t-Zh39mDUMNQ0QOr9qOj~jrg)
 

index.js

@@ -38,7 +38,7 @@ function sanitizeHeaders(options) {
     const qUrl = url.parse(queryObject[queryParam]);
 
     // external link if protocol || host || port is different
-    return !!qUrl.host && (qUrl.protocol !== urlObject.protocol || qUrl.host !== urlObject.host || qUrl.port !== urlObject.port);
+    return (qUrl.protocol !== urlObject.protocol || qUrl.host !== urlObject.host || qUrl.port !== urlObject.port);
   });
 
   if (hasExternalLink && options.hasOwnProperty("headers") && typeof (options.headers) === "object") {