Fix Dockerfile build to actually run tests and fix a unit test

Signed-off-by: Michael Irwin <mikesir87@gmail.com>

app/spec/routes/addItem.spec.js

@@ -1,9 +1,9 @@
 const db = require('../../src/persistence');
 const addItem = require('../../src/routes/addItem');
 const ITEM = { id: 12345 };
-const uuid = require('uuid/v4');
+const {v4 : uuid} = require('uuid');
 
-jest.mock('uuid/v4', () => jest.fn());
+jest.mock('uuid', () => ({ v4: jest.fn() }));
 
 jest.mock('../../src/persistence', () => ({
     removeItem: jest.fn(),