使用mocha和chai进行测试，查看承诺是否已解决或被拒绝

npm install mocha chai --save-dev

const assert = require('chai').assert;
const { doSomethingAsync } = require('./your-code');

describe('Promise Testing', function() {
  it('should resolve the promise with expected value', function() {
    // 创建一个期望被解决的承诺
    const promise = doSomethingAsync();

    return promise.then(function(result) {
      // 验证结果是否符合预期
      assert.equal(result, 'expectedValue');
    });
  });

  it('should reject the promise with expected error', function() {
    // 创建一个期望被拒绝的承诺
    const promise = doSomethingAsync();

    return promise.catch(function(error) {
      // 验证错误是否符合预期
      assert.equal(error.message, 'expectedError');
    });
  });
});