Testing the Karma unit AngularJS directives with an external URL is essential to ensure the functionality

I've been struggling to test an Angular directive with an external template using Karma, but so far I haven't had any luck. This is my first time working with Karma and I've tried various changes to the karma.conf.js file after looking for solutions online. Unfortunately, I keep encountering this error:

Error: [$injector:modulerr] Failed to instantiate module app/inventory/itemDetails.html due to:
Error: [$injector:nomod] Module 'app/inventory/itemDetails.html' is not available! You either misspelled the module name or forgot to load it.

Here's a look at my folder structure:

app
  inventory
    itemDetails.html
    itemDetailsDirective.js (templateUrl: "app/inventory/itemDetails.html")


UnitTest
  karma.conf.js
    specs
      inventorySpec.js

karma.conf.js

// list of files / patterns to load in the browser
files: [
  '../scripts/jquery.min.js',
  'scripts/angular.js',
  'scripts/angular-mocks.js',
  '../app/*.js',
  '../app/**/*.js',
  '../app/inventory/itemDetails.html',
  'specs/*.js'
],


preprocessors: {
   '../app/inventory/itemDetails.html': ['ng-html2js'] // Is this supposed to be the path relative to the karma.conf.js file?
},

ngHtml2JsPreprocessor: {
  stripPrefix: '../',
},

itemDetailsDirective.js

templateUrl: "app/inventory/itemDetails.html",

inventorySpec.js (most stuff commented out for debug purposes)

describe("itemDetailsDirective", function () {
  var element, $scope;

  beforeEach(module("app/inventory/itemDetails.html"));

  beforeEach(inject(function ($compile, $rootScope) {
     console.log("itemDetailsDirective");
     //element = angular.element('<item-details></item-details>');
     //$scope = $rootScope.$new();
     //$compile(element)($scope);
     //$scope.$digest();
  }));

  it('should display', function () {
    //var isolatedScope = element.isolateScope();
    //expect(isolatedScope.condition).toEqual("Fair");
  });

});

So, I have a UnitTest folder (VS 2013 project) parallel to the app folder. The paths under "files" in karma.conf.js are correct - all tests without templateUrl work fine.

Any help would be greatly appreciated as I'm running out of hair to pull!

javascriptangularjsunit-testingkarma-runner

Answer №1

After stumbling upon this informative article, I managed to get everything up and running smoothly:

The crucial insight was realizing that the paths should be relative to the DISK root!

To demonstrate, I made some adjustments in the karma.conf.js file by implementing cacheIdFromPath:

ngHtml2JsPreprocessor: {
    cacheIdFromPath : function(filepath) {
        console.log("karma, cacheIdFromPath " + filepath);
        var templateFile = filepath.substr(filepath.indexOf("/app/") + 1 );
        console.log("karma, templateFile: " + templateFile);
    return templateFile;
  },
},

Result:

karma, cacheIdFromPath C:/Dev/BcCom/app/inventory/itemDetails.html
karma, templateFile: app/inventory/itemDetails.html

Implementing the changes above has resolved the issue effectively!

Answer №2

I'm unsure of what you're attempting to test, but using an HTML module doesn't seem correct. You may need to utilize $httpbackend to mock the GET request. Here's a dummy example:

'use strict';
describe('TestMyDirective', function() {
  var $compile, $http, $httpBackend, $rootScope, $scope, template;

  beforeEach(module('myApp'));

  beforeEach(inject(function($injector) {
    $rootScope = $injector.get('$rootScope');
    $compile = $injector.get('$compile');
    // Inject $httpBackend service
    $httpBackend = $injector.get('$httpBackend');
    // Mock request to your html
    $httpBackend.whenGET('my.html').respond("GotIT");
    $scope = $rootScope.$new();
    template = $compile("<my-directive> </my-directive>")($scope);
    $scope.$digest();
  }));

  /*
   *
   * Tests
   *
   */
  describe('Test something', function() {
    it('should test something', function() {
       // You can test that your directive add something on the $scope
    });
  });
});

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