使用 nUnit 测试 Private 和 Protected 方法

要测试一个 protected 方法，我们的测试类需要继承包含这个 protected 方法的父类，然后在测试类中就可以公开使用这个 protected 方法了，示例如下：

假设要测试下面 ClassLibrary1.Class1 中的 MyProtectedMethod() 方法：

using System;

namespace ClassLibrary1
{
/**//// <summary>
/// Summary description for Class1.
/// </summary>
public class Class1
{

protected int MyProtectedMethod(int val1, int val2)
{
return val1 + val2;
}

} // end of class

} // end of namespace

下面是测试类代码：

using System;

using NUnit.Framework;

namespace ClassLibrary1
{
/**//// <summary>
/// Summary description for Tester.
/// </summary>
[TestFixture]
public class Tester : Class1
{
[Test]
public void MyProtectedMethod_Test()
{
Assert.AreEqual(5, base.MyProtectedMethod(2, 3));
}

} // end of class

} // end of namespace

Testing Private Methods

测试 private 方法需要使用反射

假设要测试下面 ClassLibrary1.Class1 中的 MyPrivateMethod() 方法：

using System;

namespace ClassLibrary1
{
/**//// <summary>
/// Summary description for Class1.
/// </summary>
public class Class1
{

protected int MyPrivateMethod(int val1, int val2)
{
return val1 + val2;
}

} // end of class

} // end of namespace

下面是测试类代码：

using System;
using System.Reflection;

using NUnit.Framework;

namespace ClassLibrary1
{
/**//// <summary>
/// Summary description for Tester.
/// </summary>
[TestFixture]
public class Tester
{
[Test]
public void MyPrivateMethod_Test()
{
ClassLibrary1.Class1 class1 = new ClassLibrary1.Class1();
object[] aobjParams = new object[] { 3, 4 };
object strRet;
strRet = RunInstanceMethod( typeof(ClassLibrary1.Class1),
"MyPrivateMethod",
class1,
aobjParams
);
Assert.AreEqual(7, strRet.ToString());
}

/**//// <summary>
/// 运行静态方法
/// </summary>
/// <param name="t"></param>
/// <param name="strMethod"></param>
/// <param name="aobjParams"></param>
/// <returns></returns>
public static object RunStaticMethod(System.Type t, string strMethod,
object [] aobjParams)
{
BindingFlags eFlags =
BindingFlags.Static | BindingFlags.Public |
BindingFlags.NonPublic;
return RunMethod(t, strMethod,
null, aobjParams, eFlags);
}

/**//// <summary>
/// 运行实例方法
/// </summary>
/// <param name="t"></param>
/// <param name="strMethod"></param>
/// <param name="objInstance"></param>
/// <param name="aobjParams"></param>
/// <returns></returns>
public static object RunInstanceMethod(System.Type t, string strMethod,
object objInstance, object [] aobjParams)
{
BindingFlags eFlags = BindingFlags.Instance | BindingFlags.Public |
BindingFlags.NonPublic;
return RunMethod(t, strMethod,
objInstance, aobjParams, eFlags);
}

/**//// <summary>
/// 运行自定义方法
/// </summary>
/// <param name="t"></param>
/// <param name="strMethod"></param>
/// <param name="objInstance"></param>
/// <param name="aobjParams"></param>
/// <param name="eFlags"></param>
/// <returns></returns>
private static object RunMethod(System.Type t, string
strMethod, object objInstance, object [] aobjParams, BindingFlags eFlags)
{
MethodInfo m;
try
{
m = t.GetMethod(strMethod, eFlags);
if (m == null)
{
throw new ArgumentException("There is no method '" +
strMethod + "' for type '" + t.ToString() + "'.");
}

object objRet = m.Invoke(objInstance, aobjParams);
return objRet;
}
catch
{
throw;
}
}

} // end of class

} // end of namespace