重新运行NUnit，如下：
哦？31行出错：
Assert.AreEqual(-1, my.FindMax(list4))
期望值是－1，但实际却是0，我们回头看一下代码，很容易发现，原来是
Dim max As Int32
这里出错了，max的初始值就是0，所以后面循环判断最大值，对于负数来说，是错误的，重新修改代码：
1
Public Class Class1
2
''' -----------------------------------------------------------------------------
3 ''' <summary>
4 ''' 查找最大值
5 ''' </summary>
6 ''' <param name="list">传入整数数组</param>
7 ''' <returns>返回数组中的最大值</returns>
8 ''' <remarks>
9 ''' </remarks>
10 ''' <history>
11 ''' [Tony] 2006-4-20 Created
12 ''' </history>
13 ''' -----------------------------------------------------------------------------
14
Public Function FindMax(ByVal list As Int32()) As Int32
15 Dim i As Int32
16 Dim max As Int32 = Int32.MinValue
17
18 For i = 0 To list.Length - 1
19 If list(i) > max Then
20 max = list(i)
21 End If
22 Next
23
24 Return max
25
End Function
26
27
End Class
Public Class Class1
2
''' -----------------------------------------------------------------------------3
''' <summary>4
''' 查找最大值5
''' </summary>6
''' <param name="list">传入整数数组</param>7
''' <returns>返回数组中的最大值</returns>8
''' <remarks>9
''' </remarks>10
''' <history>11
''' [Tony] 2006-4-20 Created12
''' </history>13
''' -----------------------------------------------------------------------------14
Public Function FindMax(ByVal list As Int32()) As Int32
15
Dim i As Int3216
Dim max As Int32 = Int32.MinValue17
18
For i = 0 To list.Length - 119
If list(i) > max Then20
max = list(i)21
End If22
Next23
24
Return max25
End Function26
27
End Class
再运行NUnit，这次终于正确了。
从这个例子可以看出，单元测试能帮我们发现一些比较难以发现的bug。
