Error in AngularJS Unit Test: Unidentified function caused the issue

I am delving into the realm of unit testing in Angular. Starting off by writing tests for my controllers and then moving on to testing my services.

Initially, I began with a simple test.

This is the controller code:

angular.module('app')
  .controller('TestCtrl', function ($rootScope,$scope,fileLoader,ngProgress) {
 $scope.test= [];
    $scope.init = function(){
      fileLoader.getFile("test")
        .then(function(res){
          //Success
          console.log(res);
          $scope.test= res;
        }, function(err){
          //Error
        });

      ngProgress.complete();
    }

    $scope.init();
$scope.title = "Test";
  });

This is the corresponding test code:

describe('Controller: TestCtrl', function () {

  // load the controller's module
  beforeEach(module('app'));

  var TestCtrl,
    scope,test;
  test = {};
  test.getFile = function(name) {
    return [
      {
        "id": 0,
        "name": "Test",
        "imgName": "Test.png"
      },
      {
        "id": 1,
        "name": "Test1",
        "imgName": "Test1.png"
      }];
  };


  // Initialize the controller and a mock scope
  beforeEach(inject(function ($controller, $rootScope) {
    scope = $rootScope.$new();
    TestCtrl= $controller('TestCtrl', {
      $scope: scope,
      fileLoader : test
    });
  }));

  it('should have the correct title', function () {
    expect(scope.title).toBe("Test");
  });
});

After running the test, I encountered an error that reads:

TypeError: 'undefined' is not a function (evaluating 'fileLoader.getFile("test") .then') undefined

I am puzzled as to why I am getting this error despite injecting the necessary dependencies. Is there a way to organize my mocks in a separate file, such as my fileLoader mock, and inject them more efficiently?

The confusion lies in how I am injecting the dependencies but still facing issues with undefined values.

Thank you for your help!

Answer №1

Why am I encountering this particular issue that I just can't seem to grasp?

Here's what you've defined in your code:

fileLoader.getFile("test")
   .then(function(res){

It appears that getFile() is expected to return a promise that can be resolved, but instead, it returns a plain array containing two objects.

 test.getFile = function(name) {
   return [
   {
    "id": 0,
    "name": "Test",
    "imgName": "Test.png"
   },
   {
    "id": 1,
    "name": "Test1",
    "imgName": "Test1.png"
   }]

To address this issue, consider refactoring one portion of your code. You can either use defers or handle the returned array result differently.

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