Writing Integration Tests

test('file upload integration', async () => {
  const file = new File(['test content'], 'test.txt', {
    type: 'text/plain'
  });
  
  const formData = new FormData();
  formData.append('file', file);
  
  const response = await request(app)
    .post('/api/upload')
    .attach('file', file)
    .expect(200);
  
  const storedFile = await storage.get(response.body.fileId);
  expect(storedFile.content).toBe('test content');
});