Testing a platform initializer

To test a platform initializer, add it to the providers option.

import { createApplicationHarness } from '@ngworker/spectacular';
import posthog from 'posthog-js';
import { posthogInitializer } from './posthog.initializer';

describe('posthogInitializer', () => {
  it('initializes the PostHog SDK', async () => {
    jest.spyOn(posthog, 'init');

    await createApplicationHarness({
      providers: [posthogInitializer],
    });

    expect(posthog.init).toHaveBeenCalledWith({
      api_host: 'https://eu.i.posthog.com',
      defaults: '2025-05-24',
    });
  });
});

info

createApplicationHarness supports platform initializers provided using PLATFORM_INITIALIZER.