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HTML

              
                <body ng-app="numbersApp" ng-controller="numbersController">

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine.css">

<!-- the order that these files load is critical, think twice before changing -->
<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/jasmine-html.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jasmine/2.0.0/boot.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.3/angular-mocks.js"></script>

  <p>
    <strong>Your task:</strong> Create the Jasmine unit tests for the directive.
  </p>
  <p>
    Number A: {{numbersObj.numberA}}<br />
    Number B: {{numbersObj.numberB}}<br />
    Sum: {{add(numbersObj.numberA, numbersObj.numberB)}}<br />
    Difference: {{subtract(numbersObj.numberA, numbersObj.numberB)}}
  </p>
  
<numbers-directive test-obj="numbersObj" add="add" subtract="subtract"></numbers-directive>
  
</body>
              
            
!

CSS

              
                
              
            
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JS

              
                var myApp = angular.module("numbersApp",[]);

myApp.controller("numbersController", ["$scope",function($scope){
  $scope.numbersObj = {
    numberA: 2,
    numberB: 3
  };

  $scope.add = function(a, b){
    return a + b;
  };
  $scope.subtract = function(a, b){
    return a - b;
  };
}]);

myApp.directive("numbersDirective", [function(){
  return {
    restrict: 'E', 
    replace: true,
    scope: {
      testObj: "=",
      add: "=",
      subtract: "="
    },
    template: '<div>Directive: {{testObj.numberA}}, {{testObj.numberB}}'+
    '<p><button ng-click="increment(testObj, \'numberA\')">Increment First</button> <button ng-click="decrement(testObj, \'numberA\')">Decrement First</button></p>'+
    '<p><button ng-click="increment(testObj, \'numberB\')">Increment Second</button> <button ng-click="decrement(testObj, \'numberB\')">Decrement Second</button></p>'+
    '<p><button ng-click="incrementBoth()">Increment Both</button> <button ng-click="decrementBoth()">Decrement Both</button></p></div>',
    link: function(scope, elem, attrs){
      scope.increment = function(numberObj, key){
        if(!!key){
          numberObj[key] = scope.add(numberObj[key], 1);
          return numberObj[key];
        }else{
          return numberObj++;
        }
      };
      
      scope.decrement = function(numberObj, key){
        if(!!key){
          numberObj[key] = scope.subtract(numberObj[key], 1);
          return numberObj[key];
        }else{
          return numberObj++;
        }
      };

      scope.incrementBoth = function(){
        scope.increment(scope.testObj, "numberA");
        scope.increment(scope.testObj, "numberB");
      };
      scope.decrementBoth = function(){
        scope.decrement(scope.testObj, "numberA");
        scope.decrement(scope.testObj, "numberB");
      };
    }
  };
}]);


///////////////// The Tests //////////////////

describe('numbersController', function() {
  var $scope;

  beforeEach(module('numbersApp'));

  beforeEach(inject(function ($rootScope, $controller) {
    $scope = $rootScope.$new();
    $controller('numbersController', {
      $scope: $scope 
    });
  }));

  describe('add method', function(){
    it("should add two integer numbers.", function() {    
      expect($scope.add(2,3)).toEqual(5);
    });
  });

  describe('subtract method', function(){
    it("should subtract two integer numbers.", function() {    
      expect($scope.subtract(3,1)).toEqual(2);
    });
  });
});


describe('numbersDirective directive', function() {
  var scope, elem, isolateScope, $compile;

  beforeEach(module('numbersApp'));

  beforeEach(inject(function ($rootScope, _$compile_) {
    scope = $rootScope.$new();
    $compile = _$compile_;
    
    //TODO: set up mocks
  }));
  
  function compileDirective(template){
    if(!template){
      //TODO: inject mocks here
      template = '<numbers-directive></numbers-directive>'
    }
    
    elem = angular.element(template)

    inject(function($compile){
      $compile(elem)(scope);
    });

    scope.$digest();
    isolateScope = elem.isolateScope();
  }

  beforeEach(function(){
    compileDirective();
  });
    
  describe('', function(){
    //TODO: fill this in
  });
});



              
            
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