Migrated tests to jest

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

test/unzip/unzip.js

@@ -1,8 +0,0 @@
-const unzip = arr =>
-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 => [])
-);
-module.exports = unzip;