hasCookie

1/**
2 * Checks if a cookie with the given name exists.
3 *
4 * @param name - The name of the cookie to check.
5 * @returns True if the cookie exists, false otherwise.
6 */
7export function hasCookie(name: string): boolean {
8  const encoded = encodeURIComponent(name) + '=';
9  return document.cookie.split('; ').some(cookie => cookie.startsWith(encoded));
10}

1beforeEach(() => {
2  Object.defineProperty(document, 'cookie', {
3    writable: true,
4    configurable: true,
5    value: '',
6  });
7});
8
9test('returns true if cookie exists', () => {
10  document.cookie = 'token=abc123';
11  expect(hasCookie('token')).toBe(true);
12});
13
14test('returns false if cookie does not exist', () => {
15  document.cookie = 'theme=dark';
16  expect(hasCookie('session')).toBe(false);
17});
18
19test('correctly handles encoded names', () => {
20  document.cookie = 'user%20name=John';
21  expect(hasCookie('user name')).toBe(true);
22});