core/tests/fixtures/wunderground-error.json

{
    "response": {
        "version": "0.1",
        "termsofService": "http://www.wunderground.com/weather/api/d/terms.html",
        "features": {},
        "error": {
            "type": "keynotfound",
            "description": "this key does not exist"
        }
    }
}