Unmanaged C++ Unit testing in Visual Studio 2008 - c++

Question

I want to create a managed C++ unit test project to test an unmanaged MFC project. I have read msujaws's procedural and followed it. I implemented a test method to test the return string of a function like so:
#include "stdafx.h"
#include "TxStats.h"
#include <cstdlib>
#include <atlstr.h>
#pragma managed
#using <mscorlib.dll>
#using <System.dll>
#using <system.data.dll>
using namespace std;
using namespace System;
using namespace System::Text;
using namespace System::Text::RegularExpressions;
using namespace System::Collections::Generic;
using namespace System::Runtime::InteropServices;
using namespace Microsoft::VisualStudio::TestTools::UnitTesting;
namespace AUnitTest
{
[TestClass]
public ref class TxStatsTest
{
private:
TestContext^ testContextInstance;
public:
/// <summary>
///Gets or sets the test context which provides
///information about and functionality for the current test run.
///</summary>
property Microsoft::VisualStudio::TestTools::UnitTesting::TestContext^ TestContext
{
Microsoft::VisualStudio::TestTools::UnitTesting::TestContext^ get()
{
return testContextInstance;
}
System::Void set(Microsoft::VisualStudio::TestTools::UnitTesting::TestContext^ value)
{
testContextInstance = value;
}
};
#pragma region Additional test attributes
//
//You can use the following additional attributes as you write your tests:
//
//Use ClassInitialize to run code before running the first test in the class
//[ClassInitialize()]
//static void MyClassInitialize(TestContext^ testContext) {};
//
//Use ClassCleanup to run code after all tests in a class have run
//[ClassCleanup()]
//static void MyClassCleanup() {};
//
//Use TestInitialize to run code before running each test
//[TestInitialize()]
//void MyTestInitialize() {};
//
//Use TestCleanup to run code after each test has run
//[TestCleanup()]
//void MyTestCleanup() {};
//
#pragma endregion
[TestMethod]
void TestGetTxRateStr()
{
/* str to CString
CManagedClass* pCManagedClass = new CManagedClass();
pCManagedClass->ShowMessage(strMessage);
char* szMessage = (char*)Marshal::StringToHGlobalAnsi(strMessage);
CUnmanagedClass cUnmanagedClass; cUnmanagedClass.ShowMessageBox(szMessage);
Marshal::FreeHGlobal((int)szMessage);
*/
CString out = TxStats::GetTxRateStr(1024);
// convert between MFC and .NET String implementations
String ^ myManagedString = Marshal::PtrToStringAnsi((IntPtr) (char *) out.GetBuffer());
String ^ ret = myManagedString ;///gcnew String( );
Regex ^ matStr = gcnew Regex("1024 KB/s");
StringAssert::Matches(ret, matStr);
}
};
}
That tests the code in a DIFFERENT project that looks like this:
#include "stdafx.h"
#include "TxStats.h"
TxStats::TxStats()
{
}
/*
This method returns a data rate string formatted in either Bytes, KBytes, MBytes or GBytes per sec
from an int of the bytes per second.
*/
CString TxStats::GetTxRateStr(__int64 Bps)
{
enum DataUnits dunit;
const __int64 dataSizes[]= { 0x1, // 2 ^ 0
0x400, // 2 ^ 10
0x100000, // 2 ^ 20
0x40000000};// 2 ^ 30
const char *dataStrs[] = { "B/s",
"KB/s",
"MB/s",
"GB/s"};
CString out;
double datarate;
bool finish = false;
for ( dunit = A_KBYTE; dunit <= LARGER_THAN_BIGGEST_UNIT; dunit = DataUnits(dunit+1) )
{
if ( dunit == LARGER_THAN_BIGGEST_UNIT )
{
if (dataSizes[dunit - 1] <= Bps )
{
//Gigabytes / sec
datarate = Bps / ((double) dataSizes[dunit - 1]);
out.Format("%4.2f %s", datarate, dataStrs[dunit - 1]);
finish = true;
break;
}
}
else
{
if (Bps < dataSizes[dunit])
{
//(Kilo, Mega)bytes / sec
datarate = Bps / ((double) dataSizes[dunit - 1]);
out.Format("%4.2f %s", datarate, dataStrs[dunit - 1]);
finish = true;
break;
}
}
}
if (! finish)
{
out.Format("%s", "Unknown!");
}
return out.GetBuffer();
}
void TxStats::BytesToSizeStr(__int64 bytes, CString &out)
{
if (bytes < 0)
{
out = "Err";
}
else if (bytes == 0)
{
out = "0B";
}
else
{
CString size;
CString byteChar = "B";
CString unit;
int val;
if (bytes < 1024)
{
//Bytes
unit = "";
val = (int)bytes;
}
else if ( (bytes >> 10) < 1024 )
{
//Kilobytes
unit = "K";
__int64 div = 1 << 10;
val = (int) (bytes / ((double) div ));
}
else if ( (bytes >> 20) < 1024 )
{
//Megabytes
unit = "M";
__int64 div = 1 << 20;
val = (int) (bytes / ((double) div ));
}
else
{
//Else assume gigabytes
unit = "G";
__int64 div = 1 << 30;
val = (int) (bytes / ((double) div ));
}
unit = unit + byteChar;
const char * unitCharBuf = unit.GetBuffer();
size.Format("%d%s", ((int) val), unitCharBuf);
out = size.GetBuffer();
}
}
However, when I compile this code I get the following error:
2>TxStatsTest.obj : error LNK2028: unresolved token (0A0005D4) "public: static class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > > __cdecl TxStats::GetTxRateStr(__int64)" (?GetTxRateStr#TxStats##$$FSA?AV?$CStringT#DV?$StrTraitMFC_DLL#DV?$ChTraitsCRT#D#ATL#####ATL##_J#Z) referenced in function "public: void __clrcall AUnitTest::TxStatsTest::TestGetTxRateStr(void)" (?TestGetTxRateStr#TxStatsTest#AUnitTest##$$FQ$AAMXXZ)
2>TxStatsTest.obj : error LNK2019: unresolved external symbol "public: static class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > > __cdecl TxStats::GetTxRateStr(__int64)" (?GetTxRateStr#TxStats##$$FSA?AV?$CStringT#DV?$StrTraitMFC_DLL#DV?$ChTraitsCRT#D#ATL#####ATL##_J#Z) referenced in function "public: void __clrcall AUnitTest::TxStatsTest::TestGetTxRateStr(void)" (?TestGetTxRateStr#TxStatsTest#AUnitTest##$$FQ$AAMXXZ)
2>\trunk\<proj>\Debug\AUnitTest.dll : fatal error LNK1120: 2 unresolved externals
2>Caching metadata information for c:\program files\microsoft visual studio 9.0\common7\ide\publicassemblies\microsoft.visualstudio.qualitytools.unittestframework.dll...
2>Build log was saved at "file://trunk\<proj>\AUnitTest\Debug\BuildLog.htm"
2>AUnitTest - 3 error(s), 0 warning(s)
========== Rebuild All: 1 succeeded, 1 failed, 0 skipped ==========
Can anyone suggest why the Unit test project might not be linking against the obj files of the main project? (I have already specified the main project as a dependency of the unit test project)

Answer 1

You can add
#pragma comment(lib, "TxStats.lib")
to your unit test project's stdafx.cpp to link against the other library.

Answer 2

You need to add the *.obj files of the project you want to test to the linker inputs of the unit test project