Test migration to jest by hand

Apparently using regular expressions is way easier.

test/httpGet/httpGet.js

@@ -0,0 +1,8 @@
+const httpGet = (url, callback, err = console.error) => {
+const request = new XMLHttpRequest();
+request.open('GET', url, true);
+request.onload = () => callback(request.responseText);
+request.onerror = () => err(request);
+request.send();
+};
+module.exports = httpGet;