src/app/image-file.unit.spec.ts

import { createImages, releaseImage } from './image-file';

describe('image file helpers', () => {
  beforeEach(() => {
    vi.stubGlobal('crypto', { randomUUID: vi.fn(() => 'image-id') });
    vi.stubGlobal('URL', {
      createObjectURL: vi.fn((file: File) => `blob:${file.name}`),
      revokeObjectURL: vi.fn(),
    });
  });

  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('creates studio images only for image files', () => {
    const images = createImages([
      new File(['image'], 'product.png', { type: 'image/png' }),
      new File(['text'], 'notes.txt', { type: 'text/plain' }),
    ]);

    expect(images).toEqual([
      expect.objectContaining({
        id: 'image-id',
        name: 'product.png',
        size: '0 KB',
        url: 'blob:product.png',
        selectedVariant: 'clean',
      }),
    ]);
  });

  it('formats megabyte sized files', () => {
    const images = createImages([new File([new Uint8Array(1_500_000)], 'large.jpg', { type: 'image/jpeg' })]);

    expect(images[0].size).toBe('1.4 MB');
  });

  it('releases generated object urls', () => {
    releaseImage({ id: '1', name: 'a.png', size: '1 KB', url: 'blob:a.png', file: new File(['a'], 'a.png'), selectedVariant: 'clean' });

    expect(URL.revokeObjectURL).toHaveBeenCalledWith('blob:a.png');
  });
});