Testing Angular Controllers in a Unit Testing Environment

Currently, my controller mainly calls methods in a service that wraps up and returns functions. I have already written unit tests for the service by mocking the http request.

I am wondering if it is necessary to also write unit tests for the controller in this scenario. If so, what aspects should I focus on testing considering that the service functionality has already been tested?

Below is the code for my controller:

'use strict';

/* Controllers */

var calculatorControllers = angular.module('calculatorControllers', []);

 calculatorControllers.controller('BodyController', ['$scope',
function($scope) {
   $scope.toggleNavBarActive = function($event) {            
       $($event.currentTarget).parent().find('.active').removeClass('active');
      $($event.currentTarget).addClass('active');
   };
}]);

calculatorControllers.controller('CalculatorCtrl', ['$scope',    'CalculatorService',
function($scope, CalculatorService) {
$scope.orderProp = 'asc';
$scope.result = ' awaiting calculation';
$scope.sum = {};   

$scope.add = function(val1, val2) {         
    var promise = CalculatorService.add(val1, val2);  
    promise.then(function(response) {
        $scope.result = response;
    });     
};   
}]);

calculatorControllers.controller('AboutCtrl', ['$scope', '$routeParams',
  function($scope, $routeParams) {

}]);

Answer №1

Should unit testing be a priority for the controller in this scenario?

Absolutely, striving for complete coverage is essential, regardless of whether it's the controller or service being tested. Here are two key tests to consider using Jasmine:

it('initializes $scope', function() {
var $scope = {};
$controller('PasswordController', { $scope: $scope });

expect($scope.orderProp).toEqual('asc');
expect($scope.result).toEqual(' awaiting calculation');
expect($scope.sum).toEqual({});
});

it('calls CalculatorService and updates the result', function() {
var $scope = {};
$controller('PasswordController', { $scope: $scope });

$scope.sum(1, 2);
expect(CalculatorServiceMock).toHaveBeenCalledWith(1, 2);

resolveCalculatorServiceMockAddSpyWith(3);
expect($scope.result).toEqual(3);
});

Answer №2

There is one scenario where testing the controller methods may not be necessary:

$scope.calculator = CalculatorService;

This means that all view calls like {{ calculator.sum(...) }} are handled by the service.

However, in most cases, it is important to test the controller methods. Even if the CalculatorService has already been tested, it should be mocked to ensure that the controller logic can be tested independently.

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