在jest中测试时从cookie (js-cookie)中检索数据

// userPreferences.js
import Cookies from 'js-cookie';

export function getUserPreference(key) {
  return Cookies.get(key);
}

// userPreferences.test.js
import { getUserPreference } from './userPreferences';
import Cookies from 'js-cookie';

beforeEach(() => {
  // 清除所有 cookie
  document.cookie.split(";").forEach(cookie => {
    const eqPos = cookie.indexOf("=");
    const name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
    document.cookie = `${name}=;expires=Thu, 01 Jan 1970 00:00:00 GMT;path=/`;
  });
});

test('getUserPreference should return the correct preference', () => {
  const preferenceKey = 'theme';
  const preferenceValue = 'dark';

  // 设置 cookie
  Cookies.set(preferenceKey, preferenceValue);

  expect(getUserPreference(preferenceKey)).toBe(preferenceValue);
});

test('getUserPreference should return undefined if preference does not exist', () => {
  const preferenceKey = 'language';

  expect(getUserPreference(preferenceKey)).toBeUndefined();
});

beforeEach(() => {
  document.cookie.split(";").forEach(cookie => {
    const eqPos = cookie.indexOf("=");
    const name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
    document.cookie = `${name}=;expires=Thu, 01 Jan 1970 00:00:00 GMT;path=/`;
  });
});

test('getUserPreference should return the correct preference asynchronously', async () => {
  expect.assertions(1);

  const preferenceKey = 'theme';
  const preferenceValue = 'dark';

  // 模拟异步设置 cookie
  setTimeout(() => {
    Cookies.set(preferenceKey, preferenceValue);
  }, 100);

  await new Promise(resolve => setTimeout(resolve, 200));

  expect(getUserPreference(preferenceKey)).toBe(preferenceValue);
});