背景

早上看了TDD by example (1) -- 挑战，觉得有趣，实现一个Windows Mobile版本。很多年前我也有一台文曲星，也常常玩这个猜数字游戏，所以尝试在Windows Mobile下实现。

方案

Nick Wang (懒人王) 强调需要TDD，所以我的实现方案也是TDD。

实现

使用NUintLite

测试代码需要使用NUintLite，NUintLite具体可以参考 .NET Compact Framework下的单元测试。修改Main函数如下，把结果写到SD卡上。

static void Main(string[] args)        {            System.IO.TextWriter writer = new System.IO.StreamWriter("\\Storage Card\\TestResult.txt");new NUnitLite.Runner.TextUI(writer).Execute(args);            writer.Close();

Application.Run(new MainForm());        }

编写测试代码

TDD，先写测试代码。测试代码的逻辑是按照TDD by example (1) -- 挑战写的，在实际使用中根据功能需求编写。

[TestFixture]class BingleTest{private Bingle bingle;

        [SetUp]public void SetUp()        {            bingle = new Bingle();        }

        [TearDown]public void TearDown()        {        }

        [Test]public void BuildAnswersTest()        {            bingle.BuildAnswers();Assert.True(bingle.Answers[0] != bingle.Answers[1]                    && bingle.Answers[0] != bingle.Answers[2]                    && bingle.Answers[0] != bingle.Answers[3]                    && bingle.Answers[1] != bingle.Answers[2]                    && bingle.Answers[1] != bingle.Answers[3]                    && bingle.Answers[2] != bingle.Answers[3]);        }

        [Test]public void MatchTest()        {            bingle.Answers = new int[] { 1, 2, 3, 4 };

int a;int b;int[] num;

//1 5 6 7      1A0Bnum = new int[] { 1, 5, 6, 7 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(1));Assert.That(b, Is.EqualTo(0));

//2 4 7 8      0A2Bnum = new int[] { 2, 4, 7, 8 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(0));Assert.That(b, Is.EqualTo(2));

//0 3 2 4      1A2Bnum = new int[] { 0, 3, 2, 4 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(1));Assert.That(b, Is.EqualTo(2));

//5 6 7 8      0A0Bnum = new int[] { 5, 6, 7, 8 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(0));Assert.That(b, Is.EqualTo(0));

//4 3 2 1      0A4Bnum = new int[] { 4, 3, 2, 1 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(0));Assert.That(b, Is.EqualTo(4));

//1 2 3 4      4A0Bnum = new int[] { 1, 2, 3, 4 };            bingle.Match(num, out a, out b);Assert.That(a, Is.EqualTo(4));Assert.That(b, Is.EqualTo(0));        }

        [Test]        [ExpectedException(typeof(ArgumentException))]public void MatchTest2()        {int a;int b;int[] num;

//1 1 2 3num = new int[] { 1, 1, 2, 3 };            bingle.Match(num, out a, out b);

//1 2num = new int[] { 1, 2 };            bingle.Match(num, out a, out b);        }    }

我把对Match测试的代码写在一起，我喜欢一个Test函数对应一个功能函数。而把异常处理分开出来写了，怕前面的测试抛出异常，导致测试通过了。

功能代码

功能代码的目的就是通过所以单元测试。

public class Bingle{public int[] Answers { set; get; }private int attemptTimes;

public int AttemptTimes         {get{return attemptTimes;            }        }

public Bingle()        {            Answers = new int[4];        }

public void BuildAnswers()        {Random r = new Random();while(true)            {int i = r.Next(9999);                Answers[0] = i / 1000;                Answers[1] = i % 1000 / 100;                Answers[2] = i % 100 / 10;                Answers[3] = i % 10;

if (Answers[0] != Answers[1]                    && Answers[0] != Answers[2]                    && Answers[0] != Answers[3]                    && Answers[1] != Answers[2]                    && Answers[1] != Answers[3]                    && Answers[2] != Answers[3])                {return;                }            }        }

public bool Match(int[] attemptNum, out int bingle, out int match)        {            bingle = 0;            match = 0;if (attemptNum.Length != 4)            {throw new ArgumentException("Should be 4 digits.");            }if(!(attemptNum[0] != attemptNum[1]                    && attemptNum[0] != attemptNum[2]                    && attemptNum[0] != attemptNum[3]                    && attemptNum[1] != attemptNum[2]                    && attemptNum[1] != attemptNum[3]                    && attemptNum[2] != attemptNum[3]))            {throw new ArgumentException("Should be non repeating 4 digits.");            }

            ++attemptTimes;for(int i=0; i<4; ++i)            {if (attemptNum[i] == Answers[i])                {                    ++bingle;                }else{for (int j = 0; j < 4; ++j)                    {if (attemptNum[i] == Answers[j])                        {                            ++match;                        }                    }                }            }return (bingle == 4);        }    }

单元测试结果

如果通过所有单元测试，说明功能代码编写完毕，每次修改都有run单元测试。

NUnitLite version 0.2.0Copyright 2007, Charlie Poole

Runtime Environment -    OS Version: Microsoft Windows CE 5.2.21234  .NET Version: 2.0.7045.0

/Files/procoder/Bingle.rar3 Tests : 0 Errors, 0 Failures, 0 Not Run

UI 处理

功能代码写完以后，可以写UI了，具体UI代码见源代码，下面是执行效果。

源代码：Bingle.rar

环境： VS 2008 + WM 6 professional SDK + NUnitLite