如何在C ++中单元测试受保护的方法？ [英] How do I unit test a protected method in C++?

问题描述

如何在C ++中单元测试受保护的方法？

在Java中，我将在与测试类相同的包中创建测试类，或者创建一个匿名子类，暴露我在测试类中需要的方法，但是这些方法在C ++中都不适用于我。

我使用NUnit测试非托管C ++类。

在测试代码中，定义一个派生类的测试类（直接或从其派生类之一）。为受保护的成员添加访问器，或在您的派生类中执行测试。 protected访问控制在C ++中真的不是很可怕：它不需要基类的协作来破解它。所以最好不要在基类中引入任何测试代码，即使是一个朋友声明：

  // in realclass .h 
 class RealClass {
 protected：
 int foo（int a）{return a + 1; } 
}; 
 
 //在测试代码中
 #includerealclass.h
 class Test：public RealClass {
 public：
 int wrapfoo {return foo（a）; } 
 void testfoo（int input，int expected）{
 assert（foo（input）== expected）; 
} 
}; 
 
 Test blah; 
 assert（blah.wrapfoo（1）== 2）; 
 blah.testfoo（E_TO_THE_I_PI，0）; 
  

How do I unit test a protected method in C++?

In Java, I'd either create the test class in the same package as the class under test or create an anonymous subclass that exposes the method I need in my test class, but neither of those methods are available to me in C++.

I am testing an unmanaged C++ class using NUnit.

解决方案

Assuming you mean a protected method of a publicly-accessible class:

In the test code, define a derived class of the class under test (either directly, or from one of its derived classes). Add accessors for the protected members, or perform tests within your derived class . "protected" access control really isn't very scary in C++: it requires no co-operation from the base class to "crack into" it. So it's best not to introduce any "test code" into the base class, not even a friend declaration:

// in realclass.h
class RealClass {
    protected:
    int foo(int a) { return a+1; }
};

// in test code
#include "realclass.h"
class Test : public RealClass {
    public:
    int wrapfoo(int a) { return foo(a); }
    void testfoo(int input, int expected) {
        assert(foo(input) == expected);
    }
};

Test blah;
assert(blah.wrapfoo(1) == 2);
blah.testfoo(E_TO_THE_I_PI, 0);

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