TREK/client/tests/unit/utils/fileDownload.native.test.ts

import { beforeEach, describe, expect, it, vi } from 'vitest';
import { shareFile } from '../../../src/native/nativeFiles';
import { downloadBlob, downloadFile, openFile } from '../../../src/utils/fileDownload';

vi.mock('../../../src/db/offlineDb', () => ({ getCachedBlob: vi.fn() }));
vi.mock('../../../src/native/platform', () => ({ isNativeApp: () => true }));
vi.mock('../../../src/native/nativeFiles', async () => {
  const actual = await vi.importActual<typeof import('../../../src/native/nativeFiles')>(
    '../../../src/native/nativeFiles'
  );
  return { ...actual, shareFile: vi.fn() };
});

const pdf = new Blob(['%PDF'], { type: 'application/pdf' });

beforeEach(() => {
  vi.mocked(shareFile).mockReset().mockResolvedValue();
  vi.stubGlobal('fetch', vi.fn().mockResolvedValue({ ok: true, status: 200, blob: () => Promise.resolve(pdf) }));
});

describe('fileDownload inside the native app', () => {
  it('hands an in-memory blob to the share sheet instead of an anchor', () => {
    const click = vi.spyOn(HTMLAnchorElement.prototype, 'click');
    downloadBlob(pdf, 'report.pdf');
    expect(shareFile).toHaveBeenCalledWith(pdf, 'report.pdf');
    expect(click).not.toHaveBeenCalled();
  });

  it('logs a share that failed rather than losing it', async () => {
    const report = vi.fn();
    vi.stubGlobal('reportError', report);
    vi.mocked(shareFile).mockRejectedValue(new Error('no space'));
    downloadBlob(pdf, 'report.pdf');
    await vi.waitFor(() => expect(report).toHaveBeenCalledWith(expect.any(Error)));
  });

  it('shares a protected file under its given name, or the one from its URL', async () => {
    await downloadFile('/api/trips/1/files/2/download', 'Boarding pass.pdf');
    expect(shareFile).toHaveBeenLastCalledWith(pdf, 'Boarding pass.pdf');

    await downloadFile('/uploads/files/ticket%20A.pdf');
    expect(shareFile).toHaveBeenLastCalledWith(pdf, 'ticket A.pdf');
  });

  it('opens files through the share sheet too, since there is no tab to open them in', async () => {
    await openFile('/api/trips/1/files/2/download');
    expect(shareFile).toHaveBeenLastCalledWith(pdf, 'download');
  });
});