Angular does not provide a way to retrieve the list of registered modules (at least I was not able to find a way in source code). You can however decorate angular.module method to store names in array. Something like this:
(function(orig) {
angular.modules = [];
angular.module = function() {
if (arguments.length > 1) {
angular.modules.push(arguments[0]);
}
return orig.apply(null, arguments);
}
})(angular.module);
Now you can check angular.modules array.