add rental scraper test script

test/rentalScrapeTest.js

@@ -0,0 +1,17 @@
+"use strict";
+
+const rentalCrawler = require("../app/crawler/specificCrawlers/rental");
+
+const urlToScrape = process.argv[2] || undefined;
+
+if (urlToScrape) {
+  const crawler = new rentalCrawler();
+
+  (async () => {
+    const data = await crawler.scrapeAd(urlToScrape);
+    console.log(data);
+  })();
+} else {
+  console.log("No URL to scrape. Use like this : ");
+  console.log("npm run test-olx-scraper -- URL_TO_SCRAPE");
+}