Corrupted & Broken Test Files Download — For QA Testing

// Node.js — test file upload validation
const formData = new FormData();
formData.append('file', fs.readFileSync('sample-corrupt.pdf'));

const res = await fetch('/api/upload', { method: 'POST', body: formData });
// Expected: 400 Bad Request with user-friendly error message
// NOT: 500 Internal Server Error or stack trace

// Python — test file parsing error handling
try:
    from PyPDF2 import PdfReader
    reader = PdfReader('sample-corrupt.pdf')
except Exception as e:
    # Should catch gracefully, not crash
    print(f"Expected error: {e}")

// Browser — test <input type="file"> validation
// Upload sample-corrupt.jpg → verify preview fails gracefully
// Upload sample-jpg-as-pdf.pdf → verify MIME type check works