Migrated tests to jest

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

test/howManyTimes/howManyTimes.js

@@ -1,11 +0,0 @@
-const howManyTimes = (num, divisor) => {
-if (divisor === 1 || divisor === -1) return Infinity;
-if (divisor === 0) return 0;
-let i = 0;
-while (Number.isInteger(num / divisor)) {
-i++;
-num = num / divisor;
-}
-return i;
-};
-module.exports = howManyTimes;