Test migration to jest by hand

Apparently using regular expressions is way easier.

test/URLJoin/URLJoin.js

@@ -0,0 +1,10 @@
+const URLJoin = (...args) =>
+args
+.join('/')
+.replace(/[\/]+/g, '/')
+.replace(/^(.+):\
+.replace(/^file:/, 'file:/')
+.replace(/\/(\?|&|#[^!])/g, '$1')
+.replace(/\?/g, '&')
+.replace('&', '?');
+module.exports = URLJoin;