错误 C2338：测试作者必须为您的 class 定义 ToString<const Q& q> 的特化

Question

我目前在 Visual Studio 2013 C++/CLI 本机单元测试中遇到以下错误。

error C2338: Test writer must define specialization of ToString<const Q& q> for your class class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > __cdecl Microsoft::VisualStudio::CppUnitTestFramework::ToString<class LTI::IPCommon::CPPBoxesBuffer>(const class LTI::IPCommon::CPPBoxesBuffer &).  c:\program files (x86)\microsoft visual studio 12.0\vc\unittest\include\cppunittestassert.h

我尝试了 VS2012 : Error with unit test : Assert::AreEqual( object, object ) didn't work 中建议的解决方案并编写了一个专业化，但它没有用。

这里是 BoxesBuffer.h 中的 class:

    class CPPBoxesBuffer{        
        private:
            unsigned char* _data;
            int _lines;

        public:
            CPPBoxesBuffer(unsigned char* data, int lines){ _data = data; _lines = lines; };

            // Methods for std::map. Class must be Assignable
            CPPBoxesBuffer(){ _data = nullptr; _lines = 0; };

            CPPBoxesBuffer(const CPPBoxesBuffer& other)
            {
                _lines = other._lines;
                _data = other._data;
            }

            CPPBoxesBuffer& operator=(const CPPBoxesBuffer& other)
            {
                _lines = other._lines;
                _data = other._data;
                return *this;
            }

            bool operator==(const CPPBoxesBuffer& other) const
            {
                return _lines == other._lines && _data == other._data;
            }


    };

这是测试：

    TEST_METHOD(ShouldSetAndGetCppBoxesBufferData)
    {
        std::string key = "WhenPassingData";
        unsigned char t[5] = { 'a', 'b', 'c', 'd', 'e' };
        CPPBoxesBuffer data(t, 5);
        auto result = data;
        auto db = data == result; // This compiles.

        Assert::AreEqual(data, result);  // This fails with the error.
    }

这是我写的专业：

#include "CppUnitTest.h"
#include "BoxesBuffer.h"

namespace Microsoft
{
    namespace VisualStudio
    {
        namespace CppUnitTestFramework
        {
            template<> static std::wstring ToString<CPPBoxesBuffer>(const class CPPBoxesBuffer& t) { return L"CppBoxesBuffer"; }
        }
    }
}

我做错了什么？

Answer 1

你的专业化声明在Assert::AreEqual行可以看到的地方吗？我相信如果它在不同的 cpp 文件中并且没有在头文件中原型化，那么在编译 Assert::AreEqual 时将找不到它。

错误 C2338：测试作者必须为您的 class 定义 ToString<const Q& q> 的特化

error C2338: Test writer must define specialization of ToString<const Q& q> for your class

unit-testing

c++-cli

visual-studio-2013