VS2012 : Error with unit test : Assert::AreEqual( object, object ) didn't work

问题:

I come to you for a strange problem when I use the Visual Studio Native Unit Test on VS 2012. I've a Coordinates class like that:

#ifndef COORDINATES_HPP #define COORDINATES_HPP  #include <iostream>  namespace Core { class Coordinates { public:     Coordinates();     Coordinates( int x, int y );     Coordinates( const Coordinates &copy );     ~Coordinates();      void operator=( Coordinates coordinates );     void operator+=( Coordinates coordinates );     void operator-=( Coordinates coordinates );     Coordinates operator+( Coordinates coordinates );     Coordinates operator-( Coordinates coordinates );     bool operator==( Coordinates coordinates );     bool operator!=( Coordinates coordinates );      int getX() const { return m_x; }     int getY() const { return m_y; }     void setX( const int &val ) { m_x = val; }     void setY( const int &val ) { m_y = val; }  protected:     int m_x, m_y; }; } 

So the problem appear when I use : Assert::AreEqual( Coordinates(0,0), Coordinates(0,0) );

The error sended is : Error 1 error C2678: binary '==' : no operator found which takes a left-hand operand of type 'const Core::Coordinates' (or there is no acceptable conversion) c:\program files (x86)\microsoft visual studio 11.0\vc\unittest\include\cppunittestassert.h 129 1 UnitTest1

Do you have an idea for fix that?

PS: Sorry for my english, is not my native language.

回答1:

The error received after creating your assignment operator, ie

Error 1 error C2338: Test writer must define specialization of ToString for your class class std::basic_string,class std::allocator > __cdecl Microsoft::VisualStudio::CppUnitTestFramework::ToString(const class Core::Coordinates &).

is related to needing to provide a way for the unit tests to print out the values it expected and received. You do this by creating a template specialization of the ToString function in the Microsoft::VisualStudio::CppUnitTestFramework namespace. For example:

namespace Microsoft{     namespace VisualStudio {         namespace CppUnitTestFramework {              template<>             static std::wstring ToString<Coordinates>(const Coordinates  & coord) {                 return L"Some string representing coordinate.";             }          }     } } 

After that, the unit tests should run.

回答2:

Given the error message, you might try making your operator== more const friendly:

bool operator==( const Coordinates coordinates ) const; 

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