当我针对单元测试运行代码时出现错误

Question

我有这个代码。它返回错误“运行脚本时出错”。我在终端上测试并给出了所需的结果。

   function canIWatch(age) {
       var newAge   =  parseInt(age);
       var response;

       switch (true) {

         case (isNaN(newAge) || newAge <= 0):
           response = "Invalid Age.";
           break;

         case (newAge < 6):
           response = "You are not allowed to watch Deadpool after 6.00pm.";
           break;

         case (newAge >= 6 && newAge < 17):
           response = "You must be accompanied by a guardian who is 21 or older.";
           break;

         case (newAge >= 17 && newAge < 25):
           response = "You are allowed to watch Deadpool, right after you show some ID.";
           break;

         case (newAge >= 25):
           response = "Yay! You can watch Deadpool with no strings attached!";
           break;
         }
      return response;
   }

这是单元测试代码。我不能编辑这个。

describe('canIWatch tests', function () {
  it('Should return the appropriate message for age less than 6',    function () {
    expect(canIWatch(5)).toEqual('You are not allowed to watch Deadpool after 6.00pm.');
  });

  it('Should return the appropriate message for age less than 17', function () {
    expect(canIWatch(15)).toEqual('You must be accompanied by a guardian who is 21 or older.');
  });

  it('Should return the appropriate message for age less than 25', function () {
    expect(canIWatch(20)).toEqual('You are allowed to watch Deadpool, right after you show some ID.');
  });

  it('Should return the appropriate message for age above 25 than 6', function () {
    expect(canIWatch(30)).toEqual('Yay! You can watch Deadpool with no strings attached!');
  });

  it('should return an appropriate message if provided age is invalid', function () {
    expect(canIWatch(-1)).toEqual('Invalid age.');
  });
});

我尝试使用if-else循环并仍然得到相同的错误。