Creating a universal mock object in AngularJS, specifically designed for testing with Jasmine and Karma

Question

Creating a universal mock object in AngularJS, specifically designed for testing with Jasmine and Karma

When it comes to unit testing, I've created a mock object that I use in my test files like this:

var mockObject = {
    mockMethod1 : function() {return true},
    mockMethod2 : function() {return true}
};


beforeEach(module('myModule') , function ($provide) {
    $provide.value('realObject',mockObject);
});

From what I understand, any references to 'realObject' will actually use 'mockObject' during testing.

However, I'm facing an issue where I have multiple JavaScript files for testing and I don't want to redefine 'mockObject' in each file or maintain it in more places than necessary.

Is there a way to move 'mockObject' to a separate file that can be included in karma.conf.js so that it's available for injection into all of my test files? I'm thinking something similar to how you inject $rootScope.

javascript angularjs unit-testing jasmine karma-runner

Answer 1

Answer №1

To create a global beforeEach function that is not tied to a specific suite in Jasmine, you can write it outside the context of any suite and have it executed by Jasmine. One way to achieve this is by creating a custom file to be loaded by Karma and defining your beforeEach function there without wrapping it within a describe function.

For example:

var myGlobal;

beforeEach(function() {
    // This will run before any it function.
    // Resetting a global state so the changes are testable
   myGlobal = 10
});

describe('first suite', function(){
  it('is a test', function(){
      expect(myGlobal).toBe(10);
      // Setting the value to demonstrate that beforeEach runs for each it function
      myGlobal = 20;
      expect(myGlobal).toBe(20);
  });

  it('is another test', function(){
      expect(myGlobal).toBe(10);
      myGlobal = 30;
      expect(myGlobal).toBe(30);
  });
});

describe('second suite', function(){
  it('is a test', function(){
      expect(myGlobal).toBe(10);
  });
});

Check out the working example on fiddle here

Answer 2

To create a global beforeEach function that is not tied to a specific suite in Jasmine, you can write it outside the context of any suite and have it executed by Jasmine. One way to achieve this is by creating a custom file to be loaded by Karma and defining your beforeEach function there without wrapping it within a describe function.

For example:

var myGlobal;

beforeEach(function() {
    // This will run before any it function.
    // Resetting a global state so the changes are testable
   myGlobal = 10
});

describe('first suite', function(){
  it('is a test', function(){
      expect(myGlobal).toBe(10);
      // Setting the value to demonstrate that beforeEach runs for each it function
      myGlobal = 20;
      expect(myGlobal).toBe(20);
  });

  it('is another test', function(){
      expect(myGlobal).toBe(10);
      myGlobal = 30;
      expect(myGlobal).toBe(30);
  });
});

describe('second suite', function(){
  it('is a test', function(){
      expect(myGlobal).toBe(10);
  });
});

Check out the working example on fiddle here

Answer 3

Answer №2

One approach is to create a dedicated service for storing your mock data, which can then be injected into each test file.

beforeEach(inject(function($rootScope, $controller, mockDataService) {
    appScope = $rootScope.$new();
    appCtrl = $controller('AppController', {
        $scope: appScope,
        DataService: mockDataService
    });
}));

Answer 4

One approach is to create a dedicated service for storing your mock data, which can then be injected into each test file.

beforeEach(inject(function($rootScope, $controller, mockDataService) {
    appScope = $rootScope.$new();
    appCtrl = $controller('AppController', {
        $scope: appScope,
        DataService: mockDataService
    });
}));

Answer 5

Answer №3

To easily utilize your mock object across multiple files, define it within a separate file and then export it for universal access.

Answer 6

To easily utilize your mock object across multiple files, define it within a separate file and then export it for universal access.

Creating a universal mock object in AngularJS, specifically designed for testing with Jasmine and Karma

Answer №1

Answer №2

Answer №3

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