Simple Jasmine Async Test causes timeout

I am struggling to get a simple test to run on an async function in a module. I am trying to get my head around testing and so have built a working module and manually tested it in repl.it

http://repl.it/7Qf

My module looks like this:

var weather = (function() {
    var location;
    var url = 'http://ift.tt/1BrzXCH';

    function getData(loc, callback) {
        var xhr = new XMLHttpRequest();
        xhr.open("GET", url+loc, true);
        xhr.onload = function (e) {
            if (xhr.readyState === 4) {
                if (xhr.status === 200) {
                    callback(JSON.parse(xhr.responseText));
                } else {
                    callback(JSON.parse(xhr.statusText));
                }
            }
        };
        xhr.onerror = function (e) {
            console.error(xhr.statusText);
        };
        xhr.send(null);
    }

    return {
        getTemp: function(location, callback) {
            getData(location, function(data) {
                var temp = (data.main.temp - 273.15).toFixed(2);
                callback(temp);
            });
        }
    }
}());

My test suite looks like this:

describe("Weather Module", function() {
    it('get temperature', function(done) {
        weather.getTemp('coventry,uk', function(data){
            console.log(data);
            expect(data).toBe(2.66);
            done();
        });
    });
});

I get a timeout error when I run this test. Can anyone see where I am going wrong?