Testing your components in AngularJS 1.5 with Typescript: A Guide

Currently in the process of converting some outdated AngularJS unit tests to TypeScript and encountered this issue:

Error: [$injector:unpr] Unknown provider: myComponentDirectiveProvider <- myComponentDirective

In most AngularJS unit testing examples I've come across, they showcase a main module where everything is included, and then inject that main module into the unit test using

angular.mock.module('theWholeStinkingApp')
. While this approach works well for smaller tutorials, I'm dealing with a massive application containing numerous components, services, filters, and directives. Injecting the entire app into a unit test isn't practical or efficient. It's also not ideal to start up the entire app just for a component unit test, as it defeats the purpose of isolated unit testing.

For testing services, I typically create a module within the test using beforeEach, mocking dependencies while injecting the actual service I want to test:

angular.mock.module(($provide) => {
  $provide.service('firstDependency', FirstDependencyMock);
  $provide.service('secondDependency', SecondDependencyMock);
  $provide.service('serviceIWantToTest', ServiceIWantToTest);
});

The challenge lies in creating a mock module and injecting a Component. Any assistance on this matter would be greatly appreciated.

It's important to note that I don't want to rely on

angular.mock.module('theWholeApp')
to resolve this issue. I simply aim to create a mock module and attach my component to it.

Below is a simplified version of my approach:

The Component code snippet:

angular.module('theWholeApp', [])
  .component('myComponent', {
    controller: MyComponentController,
    templateUrl: 'path/to/my/template.html'
  )
  ... // 100+ other components;

The corresponding test script:

describe('MyComponent', () => {
  beforeEach(() => {

    angular.mock.module(($provide) => {
        $provide.service('firstDependency', FirstDependencyMock);
        $provide.service('secondDependency', SecondDependencyMock);
    });

    angular.mock.inject(($injector) => {
      $rootScope = $injector.get('$rootScope');
      $componentController = $injector.get('$componentController');
      firstDependency= $injector.get('firstDependency');
      secondDependency= $injector.get('secondDependency');

      $scope = $rootScope.$new();
    });
  });

  describe('doSomething', () => {
    it('exists', () => {
      controller = $componentController('myComponent', {$scope});
        expect(controller.doSomething).toBeDefined();
      });
  });
});

Note that this is a simplified representation and not direct code. The objective is to create a mock module and incorporate the component so that

$componentController('myComponent', {$scope})
functions correctly.

Thank you!

Answer №1

Here is a unique approach that I believe could be effective, although it may not be conventional. If anyone has suggestions on how to improve this method, please feel free to share.

My solution involves creating the desired module and immediately adding it to the test.

describe('MyComponent', () => {

  // Create a new module with the necessary components.
  // This is placed outside of "beforeEach" because it only needs to be created once.
  angular.module('myComponentTestModule', [])
    .component('myComponent', {
      controller: MyComponentController, // class definition elsewhere
      templateUrl: 'path/to/my/template.html'
    )
    .service('firstDependency', FirstDependencyMock)
    .service('secondDependency', SecondDependencyMock);

  beforeEach(() => {

    // Add the newly created module to the test suite
    angular.mock.module('myComponentTestModule');

    angular.mock.inject(($injector) => {
      $rootScope = $injector.get('$rootScope');
      $componentController = $injector.get('$componentController');
      firstDependency= $injector.get('firstDependency');
      secondDependency= $injector.get('secondDependency');

      $scope = $rootScope.$new();
    });
  });

  describe('doSomething', () => {
    it('exists', () => {
      controller = $componentController('myComponent', {$scope});
        expect(controller.doSomething).toBeDefined();
      });
  });
});

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