[
  {
    "key": "127.0.0.1:-fDnkY",
    "targetUrl": "https://www.google.com/",
    "createdAt": "2017-01-08 22:37:31+0200"
  }
]

[
  {
    "key": "127.0.0.1:-fDnkY",
    "targetUrl": "https://www.google.com/",
    "createdAt": "2017-01-08T20:37:31.584Z"
  },
  {
    "key": "127.0.0.1:customSlashdot",
    "targetUrl": "http://slashdot.org/"
  }
]

Add a short URL with default createdAt to fixtures
test: Add a short URL with default createdAt to fixtures
