Test migration to jest by hand

Apparently using regular expressions is way easier.

test/sdbm/sdbm.js

@@ -0,0 +1,9 @@
+const sdbm = str => {
+let arr = str.split('');
+return arr.reduce(
+(hashCode, currentVal) =>
+(hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode),
+0
+);
+};
+module.exports = sdbm;