如何对一个调用另一个返回promise的函数进行单元测试？

// 引入断言库和被测试的函数
const assert = require('assert');
const myFunction = require('./myFunction');

// 编写测试用例
describe('myFunction', () => {
  it('should return a Promise', () => {
    const result = myFunction();
    assert(result instanceof Promise);
  });

  it('should resolve with the correct value', () => {
    const expected = 'Hello, World!';
    return myFunction().then((result) => {
      assert.strictEqual(result, expected);
    });
  });

  it('should reject with an error', () => {
    const expectedError = new Error('Something went wrong');
    return myFunction(true).catch((error) => {
      assert.strictEqual(error.message, expectedError.message);
    });
  });
});