Migrated tests to jest

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

test3/hashNode/hashNode.js

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

test3/hashNode/hashNode.test.js

@@ -0,0 +1,9 @@
+const expect = require('expect');
+const hashNode = require('./hashNode.js');
+
+test('Testing hashNode', () => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  expect(typeof hashNode === 'function').toBeTruthy();
+  hashNode(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(v => expect(v).toBe('04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'));
+});