【IT168技术文档】
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 1A0B
num = 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 0A2B
num = 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 1A2B
num = 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 0A0B
num = 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 0A4B
num = 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 4A0B
num = 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 3
num = new int[] { 1, 1, 2, 3 };
bingle.Match(num, out a, out b);
//1 2
num = 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 0.2.0
Copyright 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。
