Test files linted

test/httpDelete/httpDelete.js

@@ -1,6 +1,6 @@
 const httpDelete = (url, callback, err = console.error) => {
   const request = new XMLHttpRequest();
-  request.open("DELETE", url, true);
+  request.open('DELETE', url, true);
   request.onload = () => callback(request);
   request.onerror = () => err(request);
   request.send();