Migrated tests to jest

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

test/fibonacciUntilNum/fibonacciUntilNum.js

@@ -1,8 +0,0 @@
-const fibonacciUntilNum = num => {
-let n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));
-return Array.from({ length: n }).reduce(
-(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
-[]
-);
-};
-module.exports = fibonacciUntilNum;