如何在Cypress中生成指定长度的随机字符串用于POST请求参数

需要在POST请求中传入两个随机参数：title和description，但当前用Cypress._.random(0, 1e6)生成的只有数字且长度不达标。字段要求如下：

• title：5-20位字母数字混合字符
• description：20-200位字母数字混合字符

自定义一个生成随机字母数字字符串的工具函数，支持指定长度范围，即可满足两个字段的要求。

1. 定义随机字符串生成函数 #

// 生成指定长度范围的随机字母数字字符串
const generateRandomAlphanumeric = (minLength, maxLength) => {
  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  const length = Cypress._.random(minLength, maxLength);
  let result = '';
  for (let i = 0; i < length; i++) {
    const randomIndex = Cypress._.random(0, chars.length - 1);
    result += chars.charAt(randomIndex);
  }
  return result;
};

2. 生成符合要求的参数 #

替换原来的uuid函数调用，分别生成title和description：

const title = generateRandomAlphanumeric(5, 20);
const description = generateRandomAlphanumeric(20, 200);

it('should PAA', () => {
  // 生成指定长度范围的随机字母数字字符串
  const generateRandomAlphanumeric = (minLength, maxLength) => {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const length = Cypress._.random(minLength, maxLength);
    let result = '';
    for (let i = 0; i < length; i++) {
      const randomIndex = Cypress._.random(0, chars.length - 1);
      result += chars.charAt(randomIndex);
    }
    return result;
  };

  const title = generateRandomAlphanumeric(5, 20);
  const description = generateRandomAlphanumeric(20, 200);

  cy.getLocalStorage("accessToken").should("exist");
  cy.getLocalStorage("accessToken").then(token => {
    cy.request({
      method: 'POST',
      url: 'myURL',
      headers: {"Authorization": "Bearer " + token},
      body: {
        "extra_fields": {
          "price": 5000,
          "price_type": "price"
        },
        "area": 0,
        "type": "general",
        "user_external_id": "0926c075-6afb-4d66-ba17-8a01a6a93e70",
        "purpose": "for-sale",
        "state": "pending",
        "source": "strat",
        "contact_info": {
          "name": "Muhammad Haris BH",
          "mobile": "+923234077603",
          "roles": [
            "allow_chat_communication",
            "show_phone_number"
          ]
        },
        "title": title,
        "description": description,
        "photos": [],
        "location_id": "2-51",
        "category_id": "249"
      }
    }).then((response) => {
      expect(response.status).to.eq(201);
    });
  });
});

注：原断言写法冗余，已简化为更规范的expect(response.status).to.eq(201)。

内容的提问来源于stack exchange，提问作者Muhammad Haris