Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test/httpGet/httpGet.js

@@ -1,8 +0,0 @@
-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;