Question

以下代码用于玩彩票游戏。

let Lotto = {
    _nMap: [
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50
    ],
    _sMap: [
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
    ],

    /**
     * @param {Array} shuffleArr
     *
     * @return {Array}
     */
    _shuffleArr(shuffleArr) {
        let rndNr, tmpValue;

        for (let elmNr = shuffleArr.length - 1; elmNr > 0; elmNr--) {
            rndNr = Math.floor(
                Math.random() * (elmNr + 1)
            );

            tmpValue = shuffleArr[rndNr];

            shuffleArr[rndNr] = shuffleArr[elmNr];
            shuffleArr[elmNr] = tmpValue;
        }

        return shuffleArr;
    },

    /**
     * @return {Object}
     */
    getPick() {
        return {
            n: this._shuffleArr(this._nMap).slice(0, 5),
            s: this._shuffleArr(this._sMap).slice(0, 2)
        }
    }
};

现在我想验证实现是否正确。例如：它应该返回一组唯一的数字。我该如何测试？运行.getPick（）方法一次并验证输出或......？

Answer 1

您可以编写一个测试用例，让脚本运行10到15次，然后将值放在数组中并找到模式。这样的事情会很好：

let Lotto = {
  _nMap: [
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50
  ],
  _sMap: [
    1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
  ],

  /**
   * @param {Array} shuffleArr
   *
   * @return {Array}
   */
  _shuffleArr(shuffleArr) {
    let rndNr, tmpValue;

    for (let elmNr = shuffleArr.length - 1; elmNr > 0; elmNr--) {
      rndNr = Math.floor(
        Math.random() * (elmNr + 1)
      );

      tmpValue = shuffleArr[rndNr];

      shuffleArr[rndNr] = shuffleArr[elmNr];
      shuffleArr[elmNr] = tmpValue;
    }

    return shuffleArr;
  },

  /**
   * @return {Object}
   */
  getPick() {
    return {
      n: this._shuffleArr(this._nMap).slice(0, 5),
      s: this._shuffleArr(this._sMap).slice(0, 2)
    }
  }
};
var entries = [];
for (var i = 0; i < 100; i++)
  entries.push(JSON.stringify(Lotto.getPick()));
var counts = {};
for (var i = 0; i < entries.length; i++) {
  counts[entries[i]] = 1 + (counts[entries[i]] || 0);
}
console.log(counts);
if (Object.keys(counts).length == 100)
  alert("Excellent, 0 dupes!");
else if (Object.keys(counts).length > 75)
  alert("More than 75% unique.");
else
  alert("Less than 75% unique.");

在这里，我发现每个输出都是独一无二的。这就是您需要自动化或编写测试用例的方法。上面的代码片段本身就是一个测试解决方案。尝试一下，让我知道它是否适合您。

如何测试随机输出？

1 个答案: