Migrated tests to jest

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

test/takeRightWhile/takeRightWhile.js

@@ -1,6 +0,0 @@
-const takeRightWhile = (arr, func) => {
-for (let i of arr.reverse().keys())
-if (func(arr[i])) return arr.reverse().slice(arr.length - i, arr.length);
-return arr;
-};
-module.exports = takeRightWhile;