test then or success of $http request with jasmine

Question

I would like to test with jasmine the success of this $http request on an event listener in a directive :

$rootScope.$on('save', function () {
        var id = $scope.instance.id;
        $http({
            method: "PUT",
            url: MY_API + "/containerInstance/" + id,
            withCredentials: true,
            data: mydata
        }).success(function () {
            $scope.success = true;
        });
    }));

But i don't how i can do that, i try this :

    it('Event save', function(){
        var successCallback = jasmine.createSpy();
        $scope.instance = data;

        $httpBackend.expectPUT(MY_API + "/containerInstance/1").respond(200, 'mock data');
        expect(successCallback).not.toHaveBeenCalled();
        $rootScope.$broadcast('save');
        $httpBackend.flush();

    });

But I have error message Unexpected request: GET MY_API/page/1 Expected PUT MY_API/containerInstance/1

I don't know why he try to go to 'MY_API/page/1' (it's another url in my API)

Can you help me ?

Thank you.