ran npm run tester -> logged invertKeyValues test are invalid

test/unzip/unzip.js

@@ -0,0 +1,8 @@
+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