Migrated tests to jest

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

test/toHash/toHash.js

@@ -1,7 +0,0 @@
-const toHash = (object, key) =>
-Array.prototype.reduce.call(
-object,
-(acc, data, index) => ((acc[!key ? index : data[key]] = data), acc),
-{}
-);
-module.exports = toHash;