import { describe, expect, it } from 'vitest';

import { maskCredential } from './maskCredential.js';

describe('maskCredential', () => {
  it('shows the first 4 characters followed by asterisks', () => {
    expect(maskCredential('abcdEFGHijklMNOP')).toBe('abcd**************');
  });

  it('masks a short key without exposing more than the prefix length', () => {
    expect(maskCredential('ab')).toBe('ab**************');
  });

  it('returns only asterisks for an empty string', () => {
    expect(maskCredential('')).toBe('**************');
  });
});