Having difficulty mocking Promise.all

I would like to mock out this function:

    function getMetaData(key) {
        var deferred = $q.defer();
        var s3 = vm.initiateBucket();
        var params = {
            Bucket: constants.BUCKET_NAME,
            Key: key
        };
        s3.headObject(params, function(error, data) {
            if(error) {
                deferred.reject(error);
            }
            else {
                console.log(data);
                deferred.resolve(data.Metadata);
            }
        });
        return deferred.promise;
    };

I am using a spyOn to mock out this function:

    spyOn(awsServices, 'getMetaData').and.callFake(function() {
        console.log("MOCKED");
        return $q.resolve({
            key: "MOCKED_KEY",
            description: "MOCK_DESCRIPTION",
            views: 1
        });
    });

The spy seems to be working - It is calling the "MOCKED" console.log. Here is the function which calls getMetaData:

function getPicsRadius(){
//Ommitted
    var promises = [];

    promises.push(awsServices.getMetaData(momentsInStates[i].Key)
      .then(function(metaData) {
        console.log(metaData);
        return {
            key: metaData.key,
            description: metaData.description,
            views: metaData.views
        };
    }))

}
return promise.all(promises);

This is called by another function using promise chaining:

function getNearbyMoments() {   
    //omitted
    return calculateNearbyStates()
    .then(getPicsByState)
    .then(concatPics)
    .then(getPicsWithinRadius).then(function(){
        console.log("SHOULD LOG BUT IS NOT");
    });
}

The console.log at the end there is not printing. The only error I'm getting is an Async timeout error. So it should be getMetaData(MOCKED) -> getPicsRadius -> getNearbyMoments(Not going into the then function). I suspect this has something to do with the Promise.all that I am returning since I never have trouble spying on regular promises. Any insights?