創建新實例的測試函數

Question

如果我創建一個在新實例中存儲狀態的函數，我該如何模擬該實例構造函數，或者我是否需要這樣做？

function Game() {
this.scoreArray = []
}

Game.prototype.addScore = function(number) {
  score = new Score(number);
  this.scoreArray.push(score);
};

function Score(number){
this.number = number
}

測試.js

describe("#Game", function() {
  beforeEach(function() {
    game = new Game();

  describe("#addScore", function() {
    it("adds an instance of a score object into scoreArray", function() {
      game.addScore(5);
      game.addScore(2);
      var arrayLength = game.scoreArray.length;
      expect(arrayLength).toEqual(2);
    });
  });
});

另外，是否有更好的方法來測試它是否進入數組，例如查看實例的內容以驗證它是什么？

Answer 1

我不會嘲笑Score因為它不是外部調用，而且它沒有任何看起來需要模擬的行為。 Game和Score現在都只存儲狀態，這很容易按原樣進行測試。

是的，您可以像這樣深入研究scoreArray以測試其成員。

 describe("#Game", function() { beforeEach(function() { game = new Game(); }); describe("#addScore", function() { it("adds an instance of a score object into scoreArray", function() { game.addScore(5); game.addScore(2); var arrayLength = game.scoreArray.length; expect(arrayLength).toEqual(2); expect(game.scoreArray[0].number).toEqual(5); expect(game.scoreArray[1].number).toEqual(2); }); }); }); function Game() { this.scoreArray = [] } Game.prototype.addScore = function(number) { score = new Score(number); this.scoreArray.push(score); }; function Score(number){ this.number = number }

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