Exploring JavaScript Unit Testing: Essential dependencies for testing with Karma, jasmine, and bootstrap

After creating an application using AngularJS and additional tools based on bootstrap, I am now facing the challenge of testing everything. However, there seems to be a problem with Karma and Jasmine as an exception is thrown when running the tests.

The issue revolves around a TypeError where the object is not recognized as a method (apologies for the French language in my console).

Below is an excerpt from my karma.conf.js file:

module.exports = function(config) {
config.set({

basePath: '',

frameworks: ['jasmine'],

files: [
  'src/test/lib/angular/angular.js',
  'src/test/lib/angular/angular-mocks.js',
  'src/test/lib/angular/angular-route.min.js',
  'src/test/lib/jquery-1.9.1.min.js', 
  'src/main/webapp/resources/js/pages/*.js',
  'src/main/webapp/resources/js/pages/survey/*.js',
  'src/main/webapp/resources/js/pages/billing/*.js',
  'src/test/*Spec.js',
  'src/test/survey/*Spec.js',
  'src/test/billing/*Spec.js',
],
exclude: [
],

preprocessors: {
},

reporters: ['progress'],

port: 9876,

colors: true,

logLevel: config.LOG_INFO,

autoWatch: true,

browsers: ['IE', 'Firefox'],

junitReporter: {
        outputFile: 'unit.xml',
        suite: 'unit'
}
});
};

In both my JSP and JS files, I utilize the bootstrap-select library by Silvio Moreto:

The code snippet that triggers the exception is as follows:

angular.module("searchSurveyApp", [])
 .controller("searchSurveyController" , function($scope, $http,$window) {


    ...

    $("#selectpicker").selectpicker(); // <= launches exception in karma

Lastly, here is the JavaScript test code:

describe('Unit: searchSurveyController', function() {
  // Load the module with MainController
  beforeEach(module('searchSurveyApp'));

  var ctrl, scope, http;
  // inject the $controller and $rootScope services
  // in the beforeEach block
  beforeEach(inject(function($controller, $rootScope, $http) {
    // Create a new scope that's a child of the $rootScope
    scope = $rootScope.$new();
    http = $http;
    // Create the controller
    ctrl = $controller('searchSurveyController', {
      $scope: scope,
      $http: http
    });
  }));


  it('should write hello', 
    function() {
      console.log("hello");
  });

});

If I remove the line: $("#selectpicker").selectpicker(); from the code, the test passes without any issues. Therefore, my question is how can I effectively test this type of code?

I appreciate any assistance in advance as I am currently stuck on this matter.

Answer №1

When it comes to unit testing, relying solely on the DOM may not be sufficient, as unit tests focus on individual code units rather than end-to-end functionality. In environments like Jasmine, a real DOM is not readily available. Operations such as "$("#selectpicker").selectpicker();" should be wrapped inside directives for better encapsulation. Directives can then be tested separately using methods that simulate a virtual DOM (https://example.com/unit-testing-directive)

For services or factories, any DOM-related operations are challenging to test. It's recommended to refactor your service to delegate DOM manipulation to directives in order to improve testability.

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