Migrated tests to jest

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

test/hashNode/hashNode.js

@@ -1,15 +0,0 @@
-const crypto = require('crypto');
-const hashNode = val =>
-new Promise(resolve =>
-setTimeout(
-() =>
-resolve(
-crypto
-.createHash('sha256')
-.update(val)
-.digest('hex')
-),
-0
-)
-);
-module.exports = hashNode;