当我try 对private methods in a Class进行单元测试时，错误为private methods are only accessible inside the class.在这里，我为我的类和mocha测试添加了示例片段.请为我提供实现私有方法单元测试的解决方案.

Class Name: Notification.ts

class Notification {
 constructor() {}
 public validateTempalte() {
  return true;
 }

 private replacePlaceholder() {
  return true;
 }
}

Unit Test:

import {Notification} from 'Notification';
import * as chai from "chai";

describe("Notification", function(){

  describe('#validateTempalte - Validate template', function() {
      it('it should return success', function() {
        const result = new Notification()
        chai.expect(result.validateTempalte()).to.be.equal(true);
      });
    });
  describe('#replacePlaceholder - Replace Placeholder', function() {
      it('it should return success', function() {
        const result = new Notification()
        // As expected getting error "Private is only accessible within class"
        chai.expect(result.replacePlaceholder()).to.be.equal(true);
      });
    });
});

作为一种解决方法，目前我正在将函数replacePlaceholder的访问说明符更改为public.但我认为这不是一个有效的方法.