Using the `window` object in Jasmine with Angular, a mock can be created for testing purposes

Question

Using the `window` object in Jasmine with Angular, a mock can be created for testing purposes

In my current project, I have a function that I need to write unit tests for. Within this function, I am comparing the global objects window and parent using

const isEqual = (window === parent)

.

I am wondering what would be the most effective way to mock these objects in an Angular/TypeScript environment.

One idea is to pass these objects as parameters to the function, but this approach does not fully address the issue since I still need to figure out how to mock the global window object when using something like

getSomeData(win: Window, parent: Window) { // ... }

.

angular typescript unit-testing jasmine

Answer 1

Answer №1

My preferred solution was the following:

Develop a service that will inject the window object.

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root',
})
export class GlobalObjectService {
  public getWindow(): Window {
    return window;
  }
}

During testing, it can be implemented as follows:

describe('TestService', () => {
  ...
  let globalObjectService: jasmine.SpyObj<GlobalObjectService>;

  beforeEach(() => {
    globalObjectService = jasmine.createSpyObj('GlobalObjectService', ['getWindow']);
    ...
  });

  describe('#testFunc', () => {
    it('should test something', () => {
      globalObjectService.getWindow.and.returnValue({
        location: {
          href: 'window.location.href',
        },
      });
      ...
    });
  });
});

Answer 2

My preferred solution was the following:

Develop a service that will inject the window object.

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root',
})
export class GlobalObjectService {
  public getWindow(): Window {
    return window;
  }
}

During testing, it can be implemented as follows:

describe('TestService', () => {
  ...
  let globalObjectService: jasmine.SpyObj<GlobalObjectService>;

  beforeEach(() => {
    globalObjectService = jasmine.createSpyObj('GlobalObjectService', ['getWindow']);
    ...
  });

  describe('#testFunc', () => {
    it('should test something', () => {
      globalObjectService.getWindow.and.returnValue({
        location: {
          href: 'window.location.href',
        },
      });
      ...
    });
  });
});

Using the `window` object in Jasmine with Angular, a mock can be created for testing purposes

Answer №1

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