Migrated tests to jest

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

test/unzipWith/unzipWith.js

@@ -1,10 +0,0 @@
-const unzipWith = (arr, fn) =>
-arr
-.reduce(
-(acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),
-Array.from({
-length: Math.max(...arr.map(x => x.length))
-}).map(x => [])
-)
-.map(val => fn(...val));
-module.exports = unzipWith;