interaction Django and Ajax

interaction Django and Ajax

I'm trying to send data to the server and use with AJAX
function stats(e){
jQuery.ajax({
type: "POST",
url:"stats",
data:{'csrfmiddlewaretoken':
document.getElementsByName('csrfmiddlewaretoken')[0].value,
'test':{}},
success: function(data) {alert("Congratulations!"+data);},
error: function(data) {
alert("Please report this error: "+data.responseText);}
});
}
function in views.py:
def stats(request):
if request.is_ajax():
if request.user.is_authenticated():
if request.POST:
return HttpResponse(request.POST['test'])
else:
return HttpResponse("post_no_exists")
else:
return HttpResponse("no authenticate")
else:
raise Http404
Django raise MultiValueDictKeyError 'key "test" not found in QueryDict'.
When I change "test":{} -> "test":1 it succeds. Whats my error?