fix(ngMock#$controller): properly assign bindings to all types of controllers (e.g. class-based)

The decorated version of `$controller` is able to assign bindings to a controller instance prior to
instantiation, emulating the behavior of `$compile` with directive controllers.

There are cases, that the actual controller instance is different than the pre-populated one (e.g.
when the controller constructor function returns a value or when the controller is an ES2015 Class).
While `$compile` accounts for such situation, by re-asigning the bindings after the controller has
been instantiated, `ngMock`'s `$controller` didn't.

This commit fixes it, by re-applying the bindings if the actual controller instance is different
than the original one (similar to how `$compile` would do it).

Fixes #14437

Author: gkalpak

src/ngMock/angular-mocks.js

@@ -2181,9 +2181,15 @@ angular.mock.$RootElementProvider = function() {
 angular.mock.$ControllerDecorator = ['$delegate', function($delegate) {
   return function(expression, locals, later, ident) {
     if (later && typeof later === 'object') {
-      var create = $delegate(expression, locals, true, ident);
-      angular.extend(create.instance, later);
-      return create();
+      var instantiate = $delegate(expression, locals, true, ident);
+      angular.extend(instantiate.instance, later);
+
+      var instance = instantiate();
+      if (instance !== instantiate.instance) {
+        angular.extend(instance, later);
+      }
+
+      return instance;
     }
     return $delegate(expression, locals, later, ident);
   };

test/ngMock/angular-mocksSpec.js

@@ -1,5 +1,7 @@
 'use strict';
 
+/* globals support: false */
+
 describe('ngMock', function() {
   var noop = angular.noop;
 
@@ -1888,6 +1890,53 @@ describe('ngMock', function() {
         expect(called).toBe(true);
       });
     });
+
+    it('should support assigning bindings when a value is returned from the constructor',
+      function() {
+        var called = false;
+        var data = [
+          { name: 'derp1', id: 0 },
+          { name: 'testname', id: 1 },
+          { name: 'flurp', id: 2 }
+        ];
+        module(function($controllerProvider) {
+          $controllerProvider.register('testCtrl', function() {
+            called = true;
+            expect(this.data).toBe(data);
+
+            return {};
+          });
+        });
+        inject(function($controller, $rootScope) {
+          var ctrl = $controller('testCtrl', { scope: $rootScope }, { data: data });
+          expect(ctrl.data).toBe(data);
+          expect(called).toBe(true);
+        });
+      }
+    );
+
+    if (support.classes) {
+      it('should support assigning bindings to class-based controller', function() {
+        var called = false;
+        var data = [
+          { name: 'derp1', id: 0 },
+          { name: 'testname', id: 1 },
+          { name: 'flurp', id: 2 }
+        ];
+        module(function($controllerProvider) {
+          $controllerProvider.register('testCtrl', class TextCtrl {
+            constructor() {
+              called = true;
+            }
+          });
+        });
+        inject(function($controller, $rootScope) {
+          var ctrl = $controller('testCtrl', { scope: $rootScope }, { data: data });
+          expect(ctrl.data).toBe(data);
+          expect(called).toBe(true);
+        });
+      });
+    }
   });