GoogleTest仅在.h文件中定义时才起作用

Question

I have spend all day trying to make GoogleTest work in Visual Studio 2013. Finally, made it to "work", but it only works when definition of the function is place in the .h file. Using separate compilation, such as =:

// simplemath.h
#include <cmath>
double cubic(double d);

// simple.cpp
#include "simplemath.h"
double cubic(double d)
{
    return pow(d, 3);
}

// unittest_SimpleMath.cpp
#include "gtest/gtest.h"
#include "simplemath.h"    
TEST(testMath, myCubeTest)
{
    EXPECT_EQ(1000, cubic(10));
}  

produces the following error:

1>------ Build started: Project: unittest_SimpleMath, Configuration: Release Win32 ------
1>  unittest_SimpleMath.cpp
1>unittest_SimpleMath.obj : error LNK2001: unresolved external symbol "double __cdecl cubic(double)" (?cubic@@YANN@Z)
1>C:\Users\alex\Documents\Visual Studio 2013\Projects\SimpleMath\Release\unittest_SimpleMath.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========

Edit: Forgot to mention one important thing. I followed tutorial http://www.bogotobogo.com/cplusplus/google_unit_test_gtest.php to figure out how to pair-up Gtest and VS2013. My solution structure is identical to what is desc. in the tutorial - 3 projects.

Answer 1

It seems you are using different project for the tests. You should either use tests in the same project you have your cubic function. Or make lib from your cubic code and link it in the tests project. The errors you have aren't connected to gtest in any way. You just have not compiled your cpp file to an object file which could be used in the tests project.

Also, make sure you have gtest_main*.lib (asterisk there because it has a few name, you should choose whatever you need) linked in your test project since you don't have main for it(or you didn't show it).