tdd - 如何重复/循环进行 Mocha 测试

Question

我一直在进行一些mocha/chai测试，但除了在每个“it”测试中放置一个循环并一次又一次地迭代外，我仍然没有找到一种在多种可能性下运行测试的好方法。问题是，如果我有数十或数百个测试，我不想一遍又一遍地编写相同的for循环。

有没有更优雅的方式做到这一点？尤其是一种可以同时循环使用不同测试参数进行的所有测试吗？

describe('As a dealer, I determine how many cards have been dealt from the deck based on', function(){

  console.log(this);

  beforeEach(function(){
    var deck = new Deck();
    var myDeck = deck.getCards();
  });


    it('the number of cards are left in the deck', function(){
      for(var i = 1; i<=52; i++){
        myDeck.dealCard();
        expect(myDeck.countDeck()).to.equal(52-i);
      }
    });

    it('the number of cards dealt from the deck', function(){
      expect(myDeck.countDealt()).to.equal(i);
    });

    it('the sum of the cards dealt and the cards left in the deck', function(){
      expect(myDeck.countDeck() + myDeck.countDealt()).to.equal(52)
    });

});

Answer 1

我在Loop Mocha tests?上实现了neezer的解决方案，其中涉及将整个测试放入一个闭包中并通过循环执行它。

请注意，该循环与函数中的beforeEach()混为一谈，因为它每次测试执行52次。如果这些元素是动态的，并且在每个循环中执行不超过一次，则将这些元素放置在beforeEach()函数中不是一个好主意。

该代码看起来像这样，并且似乎可以正常工作。

var myDeck = new Deck(Card);

function _Fn(val){

    describe('As a dealer, I determine how many cards have been dealt from the deck based on', function(){

      myDeck.dealCard();

      var cardCount = 0;
      var dealtCount = 0;

      cardCount = myDeck.countDeck();
      dealtCount = myDeck.countDealt();

      it('the number of cards are left in the deck', function(){
        expect(cardCount).to.equal(52-val);
      });

      it('the number of cards dealt from the deck', function(){
        expect(dealtCount).to.equal(val);
      });

      it('the sum of the cards dealt and the cards left in the deck', function(){
        expect(cardCount + dealtCount).to.equal(52);
      });

    });

}

for(var i = 1; i<=52; i++){
  _Fn(i);
}