refactor(angular_1_router): Added value for router root component

Closes #4965

Closes #5052

modules/angular1_router/test/integration/router_spec.js

@@ -0,0 +1,79 @@
+'use strict';
+
+describe('router', function () {
+
+  var elt,
+      $compile,
+      $rootScope,
+      $router,
+      $compileProvider;
+
+  beforeEach(function () {
+    module('ng');
+    module('ngComponentRouter');
+    module(function($provide) {
+      $provide.value('$routerRootComponent', 'app');
+    });
+    module(function (_$compileProvider_) {
+      $compileProvider = _$compileProvider_;
+    });
+
+    inject(function (_$compile_, _$rootScope_, _$router_) {
+      $compile = _$compile_;
+      $rootScope = _$rootScope_;
+      $router = _$router_;
+    });
+  });
+
+  it('should work with a provided root component', inject(function($location) {
+    registerComponent('homeCmp', {
+      template: 'Home'
+    });
+
+    registerComponent('app', {
+      template: '<div ng-outlet></div>',
+      $routeConfig: [
+        { path: '/', component: 'homeCmp' }
+      ]
+    });
+
+    compile('<app></app>');
+
+    $location.path('/');
+    $rootScope.$digest();
+    expect(elt.text()).toBe('Home');
+  }));
+
+  function registerComponent(name, options) {
+    var controller = options.controller || function () {};
+
+    ['$onActivate', '$onDeactivate', '$onReuse', '$canReuse', '$canDeactivate'].forEach(function (hookName) {
+      if (options[hookName]) {
+        controller.prototype[hookName] = options[hookName];
+      }
+    });
+
+    function factory() {
+      return {
+        template: options.template || '',
+        controllerAs: name,
+        controller: controller
+      };
+    }
+
+    if (options.$canActivate) {
+      factory.$canActivate = options.$canActivate;
+    }
+    if (options.$routeConfig) {
+      factory.$routeConfig = options.$routeConfig;
+    }
+
+    $compileProvider.directive(name, factory);
+  }
+
+  function compile(template) {
+    elt = $compile('<div>' + template + '</div>')($rootScope);
+    $rootScope.$digest();
+    return elt;
+  }
+});