Migrated tests to jest

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

test/JSONToDate/JSONToDate.js

@@ -1,5 +0,0 @@
-const JSONToDate = arr => {
-const dt = new Date(parseInt(arr.toString().substr(6)));
-return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;
-};
-module.exports = JSONToDate;