1. 准备工作

a.下载googletest源码

gtest源码下载地址：

下载地址：https://github.com/google/googletest

git 仓库地址：https://github.com/google/googletest.git

b.clion工程准备 

2. 目录结构

 3.Cmake脚本

function.cmake

#扫描源文件
function(glob_all_source_files DIR_LIST)
    foreach(dir ${DIR_LIST})
        ## GLOB_RECURSE 会搜索子目录  GLOB 搜索当前目录
        file(GLOB SRC_C_LIST "${dir}/*.c")
        file(GLOB SRC_CXX_LIST "${dir}/*.cpp")
        list(APPEND FILE_LIST ${SRC_C_LIST} ${SRC_CXX_LIST})
    endforeach()
    #源文件会存放到变量TRAGET_OBJ_SRC_LIST中
    set(TRAGET_OBJ_SRC_LIST ${FILE_LIST} PARENT_SCOPE)
endfunction()

#调用函数
glob_all_source_files("${TARGET_OBJ_SRC_PATH}")
#添加到动态库
#add_library(CppLLT OBJECT ${TRAGET_OBJ_SRC_LIST})
#add_executable 之后链接
#target_link_libraries(CppLLT ${CppTestObj})
#或者直接编译到执行文件中 add_executable(CppLLT main.cpp ${TRAGET_OBJ_SRC_LIST})

gtest.cmake

#googletest代码主目录
set(GOOGLETEST_MAIN_PATH ${CMAKE_SOURCE_DIR}/googletest)
set(PATH_GTEST_INC_LIST
        ${GOOGLETEST_MAIN_PATH}/googletest/include
        ${GOOGLETEST_MAIN_PATH}/googletest/include/gtest
        ${GOOGLETEST_MAIN_PATH}/googlemock/include
        ${GOOGLETEST_MAIN_PATH}/googlemock/include/gmock)
        
include_directories(${PATH_GTEST_INC_LIST})

##set(build_gooletest "ON") 重新编译gtest
##需要在add_executable之后链接 target_link_libraries(CppTest ${gtestlibs})
##set(build_gooletest "OFF") 直接连接准备好的静态库
if ("${build_gooletest}" STREQUAL "ON")
    ##编译有告警的时候，删除googletest源码里面对低版本cmake的语句 cmake_minimum_required(VERSION ...)
    set(GOOGLETEST_VERSION 3.15)
    #加入编译
    add_subdirectory(${GOOGLETEST_MAIN_PATH})
    set(gtestlibs gtest gtest_main gmock gmock_main)
    #放在add_executable之后
    #target_link_libraries(CppTest ${gtestlibs})
    ##下面不用
    #Link with GoogleTest
    #target_link_libraries(CppTest gtest gtest_main)
    #Link with GoogleMock
    #target_link_libraries(CppTest gmock gmock_main)
else() 
    #静态库目录
    link_directories(${PROJECT_SOURCE_DIR}/lib)
    set(LLT_GTEST_LIBS
            libgmock_maind.a
            libgmockd.a
            libgtest_maind.a
            libgtestd.a)
    link_libraries(${LLT_GTEST_LIBS})
endif()

CMakeList.txt

cmake_minimum_required(VERSION 3.20)
project(CppLLT)

set(CMAKE_CXX_STANDARD 17)
add_compile_options(-Wall)
# ON 重新编译gtest OFF,链接准备好的库
set(build_gooletest "OFF")

include("${PROJECT_SOURCE_DIR}/gtest.cmake")
include("${PROJECT_SOURCE_DIR}/function.cmake")

#添加源代码目录
set(TARGET_OBJ_SRC_PATH
        ${PROJECT_SOURCE_DIR}/src)

glob_all_source_files("${TARGET_OBJ_SRC_PATH}")

add_executable(CppLLT main.cpp ${TRAGET_OBJ_SRC_LIST})

#链接gtest库
if ("${build_gooletest}" STREQUAL "ON")
    target_link_libraries(CppLLT ${gtestlibs})
endif()

注：googletest不用每次都编译,第一次编译出来后，拷贝到一个地方，后续直接去链接就行了。

我这里拷贝放到了lib目录下。 

4. 测试用例

#include "gtest.h"

int AddTest(int a, int b)
{
    return a + b;
}

TEST(AddTest, test_t0)
{
    EXPECT_EQ(AddTest(1, 2), 3);
}

5. 主函数

#include "gtest.h"
#include "gmock.h"

GTEST_API_ int main(int argc, char **argv)
{
    testing::InitGoogleMock(&argc, argv);
    testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

6. 执行结果

常见问题：

1. googletest提示cmake版本要求较低冲突

CMake Deprecation Warning at googletest/googletest/CMakeLists.txt:56 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument  value or use a ... suffix to tell
  CMake that the project does not need compatibility with older versions.

 这种在主目录已经指定了cmake的最低版本要求，删除googletest里面对cmake最低版本的请求即可。

 2. cygwin编译器和mingw编译器，在普通的测试TEST的时候没区别，在需要用到gmock的时候，cygwin报错信息不够详细，这个时候建议用mingw

 例如：测试用例

#include "gtest.h"
#include "gmock.h"
#include <string>
#include 
using namespace std;
using namespace testing;

class Student {
public:
    virtual ~Student(){};
    virtual int GetAge(string name) = 0;
};

class MockStudent : public Student {
public:
    //MOCK_METHOD1(GetAge, int(string name));
    MOCK_METHOD(int, GetAge, (string name), (override));
};

TEST(MockStudent, test_0)
{
    cout<< "func begin: " << __func__  << endl;
    MockStudent zhang;
    EXPECT_CALL(zhang, GetAge(_))
            .Times(::testing::AtLeast(3))
            .WillOnce(::testing::Return(18))
            .WillRepeatedly(::testing::Return(19));
    cout<< "func end:" << __func__  << endl;
}

Mingw编译器报错信息如下：

 cgywin编译器报错如下，不方便定位：

 后来我发现，这玩意儿是cygwin不支持gmock，切换成mingw就正常了。真是吐了！