Configuration and entry example test of gtest under vs2013

Original link: http://blog.csdn.net/ruyueyini/article/details/47448211

Configuration steps

1. Download gtest first and unzip it. Download address: https://github.com/google/googletest
2. Open the gtest--msvc--gtest project with vs2013 (double-click gtest), the following "One-Way Upgrade" window will pop up, click "OK", the "Migration Report" will pop up, and close the "Migration Report".
3. Open the project gtest with vs2013; right-click on gtest -> Generate, you can generate gtestd.lib (this corresponds to Debug), and there is a gtest.lib (this corresponds to Release), which can generate corresponding files as needed. Note the configuration to check before compiling: Right-click on gtest -> Properties -> Configuration Properties -> C/C++ -> Code Generation, check the "Runtime Library" on the right, and select Multi-Thread Debugging (MTd); The configuration is the same, keep the same.
4. Write an example configuration: 
   Build a project: 
   In VS2013, create a project, Visual C++ -> win32 console application (win32 console application), name it test, enter the wizard, and complete it directly. 
   Configuration: 
   Right-click on the project name->Properties->Configuration Properties->C/C++->General->Additional Include Directories: Add /gtest/include under the gtest library path; 
   right-click on the project name->Properties->Configuration Properties- >C/C++->Code Generation->Runtime Library: Same as the previous gtest configuration, select MTd; 
   right-click on the project name->Properties->Configuration Properties->Linker->Input->Additional Dependencies: Enter the gtest path /msvc/gtest/Debug/gtestd.lib under. 
   At this point, the configuration is complete, and you can start writing test cases.
5. Example 
   header file fun.h

# pragma once
int fun(int a, int b);

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Source file fun.cpp

#include "fun.h"  
#include <iostream>  
using namespace std;

int fun(int a, int b)
{
    return (a - b);
}

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Source file test.cpp

//#include "stdafx.h"   VS2013 中不需要此句，详见第6条
#include "gtest/gtest.h"  
#include  "fun.h"
#include <tchar.h>   //若不包含，main中参数会报错

TEST(fun, case1)
{
    EXPECT_LT(-2, fun(1, 2));
    EXPECT_EQ(-1, fun(1, 2));
    ASSERT_LT(-2, fun(1, 2));
    ASSERT_EQ(-1, fun(1, 2));
}

int _tmain(int argc, _TCHAR* argv[])
{
    //多个测试用例时使用，如果不写，运行RUN_ALL_TESTS()时会全部测试，加上则只返回对应的测试结果  
    //testing::GTEST_FLAG(filter) = "test_case_name.test_name";
    //测试初始化
    testing::InitGoogleTest(&argc, argv);
    //return RUN_ALL_TESTS();
    RUN_ALL_TESTS();
    //暂停，方便观看结果,结果窗口将会一闪而过  
    system("PAUSE");
    return 0;
}

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Result: 
 
6. About stdafx.h 
vs2013 already includes stdafx.h, if it is added repeatedly in the source file, an error will be reported. 

7 运行库版本不同导致链接.LIB静态库时发生重复定义问题的一个案例分析和总结 
参考http://www.cnblogs.com/waytofall/archive/2012/05/11/2496360.html 
 
一般情况下不会出错，不需要自己去配置或者寻找；我在配置的时候一直报错，找不到libcpmtd.lib文件，为此查找了很多种方法均不好使，最后重装了vs2013好使了，可能是安装的问题；看到网上说还有一种原因是gtest编译库的方式与实例编译的方式不同，就是前面第三步中配置MTd的地方，最好保持一致。