Angular watch doesn't work with controllerAs syntax

Have a problem with watching response.

I have a SettingsCtrl as settings and this is my view:

<input  type="text" class="form-control" ng-model="settings.test.one"  />
<input  type="text" class="form-control" ng-model="settings.test.second"  />

And this is my Controller:

app.controller('SettingsCtrl', function ($scope, settingsFactory, Test) {
  
  var vm = this;
  
  
  settingsFactory.test().then(function(response){
  
     vm.test = response;
  })
  
  /////  OR
  
  vm.test = Test; // this is from ui-router resolve
  
  
    $scope.$watch(angular.bind('vm', function () {
    return vm.test;
    }), function (newV, oldV) {
    console.log(newV, oldV); 
    });
  
    $scope.$watch(function watch(scope){
     return vm.test;
    }), function handle(newV, oldV) {
    console.log(newV, oldV);
    });
  
    $scope.$watch('vm', function (newVal, oldVal) {
        console.log('newVal, oldVal', newVal, oldVal);
    });
  
  });

I've been searching and have found different solutions, but non of them works.

**** It's watch only first time, when controller is loaded and I see my console logs, but when I try to make changes watchers do nothing.

What I'm doing wrong?

If I'm not wrong, your $watch is hit the first time a controller is loaded, but not when you change something in the object. If that's true, then try this:

$scope.$watch('vm', function (newVal, oldVal) {
    console.log('newVal, oldVal', newVal, oldVal);
}, true);

By default, $watch function watches the reference so if you only change a property of the watched object it will not be fired. By adding true at the end, you start deep watching, and you will get a hit each time you change a property of the object.