import { describe, expect, it } from 'vitest';
import { isValidImportBase64 } from '../../server/assessor-http-server';

describe('import Base64 validation', () => {
  it('validates a 5.9 MB file payload iteratively without exhausting the call stack', () => {
    const encoded = Buffer.alloc(5_900_000, 0x61).toString('base64');

    expect(isValidImportBase64(encoded)).toBe(true);
    expect(isValidImportBase64(encoded.slice(0, -4) + '***=')).toBe(false);
  });

  it('rejects misplaced padding and incomplete groups', () => {
    expect(isValidImportBase64('YQ==')).toBe(true);
    expect(isValidImportBase64('Y=Q=')).toBe(false);
    expect(isValidImportBase64('YQ=')).toBe(false);
  });
});