Migrated tests to jest

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

test5/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;