Test migration to jest by hand

Apparently using regular expressions is way easier.

test/randomIntArrayInRange/randomIntArrayInRange.js

@@ -0,0 +1,3 @@
+const randomIntArrayInRange = (min, max, n = 1) =>
+Array.from({ length: n }, () => Math.floor(Math.random() * (max - min + 1)) + min);
+module.exports = randomIntArrayInRange;