My mistake

HTML

<div ng-controller="myCtrl">
    <div> inject: {{injected}} </div>
    <div> my_inject: {{my_inject}} </div>
</div>

JavaScript

var app = angular.module('myApp', ['mod1', 'mod2']);
var mod1 = angular.module('mod1', []);
var mod2 = angular.module('mod2', []);

app.controller('myCtrl', ['$scope', '$injector', 'test', function($scope, $injector, test) {
    $scope.injected = test.data;
    var inj = angular.injector(['mod1']);
    $scope.my_inject = inj.get('test').data;
}]);

mod1.factory('test', function() {
    return {
        data: 1  
    };
});
mod2.factory('test', function() {
    return {
        data: 2
    };
});