C++11 Google GTest框架简单使用

首先需要在本机上编译和安装Google GTest的最新版本。
macos - How to install GTest on Mac OS X with homebrew? - Stack Overflow

参考回答15的Update Revision就可以。
这样会把Google Test和GMock一起装上。
然后就是写两个CMakeLists.txt文件试一下。
本工程测试最简单的加减法，因为一次build只能定义一个main函数，所以多个子模块的测试和主模块main函数是放在不同的CMakeLists.txt文件里面的。编译出来的二进制文件也不一样。
本工程的结构如下，

Screen Shot 2021-08-06 at 3.28.37 PM.png

程序代码如下，
main.cpp

#include <iostream>

#include "cal/cal.h"

int main(int argc, char* argv[]) {
    int c = add(2, 3);
    std::cout << "add(2, 3) = " << c << std::endl;
    return 0;
}

main.cpp的CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
project(gtest_test)

add_definitions(-std=c++14)
add_definitions(-g)



find_package(Boost REQUIRED COMPONENTS
    system
    filesystem
    serialization
    program_options
    thread
    )

include_directories(${Boost_INCLUDE_DIRS} /usr/local/include ${CMAKE_CURRENT_SOURCE_DIR}/include)

LINK_DIRECTORIES(/usr/local/lib)

file( GLOB APP_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/*.h
    ${CMAKE_CURRENT_SOURCE_DIR}/include/cal/impl/*.cpp)
foreach( sourcefile ${APP_SOURCES} )
        file(RELATIVE_PATH filename ${CMAKE_CURRENT_SOURCE_DIR} ${sourcefile})
    if( "${filename}" STREQUAL "main.cpp")
        string(REPLACE ".cpp" "" file ${filename})
        add_executable(${file}  ${APP_SOURCES})
        target_link_libraries(${file} ${Boost_LIBRARIES})
        target_link_libraries(${file} pthread ssl crypto libgtest.a libgmock.a)
    endif()
endforeach( sourcefile ${APP_SOURCES})

cal.h

#ifndef _FREDRIC_CAL_H_
#define _FREDRIC_CAL_H_

int add(int a, int b);

int sub(int a, int b);

#endif

cal.cpp

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

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

cal_test.cpp

#include <gtest/gtest.h>

#include "cal/cal.h"

GTEST_TEST(CalSuite, AddTest) {
    ASSERT_EQ(5, add(3,2));
}

GTEST_TEST(CalSuite, SubTest) {
    ASSERT_EQ(1, sub(3, 2));
}

cal_test.cpp的CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
project(cal_test)

add_definitions(-std=c++14)
add_definitions(-g)



find_package(Boost REQUIRED COMPONENTS
    system
    filesystem
    serialization
    program_options
    thread
    )

include_directories(${Boost_INCLUDE_DIRS} /usr/local/include ${CMAKE_CURRENT_SOURCE_DIR}/../../)

LINK_DIRECTORIES(/usr/local/lib)

file( GLOB APP_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/*.h
    ${CMAKE_CURRENT_SOURCE_DIR}/../impl/*.cpp ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
foreach( sourcefile ${APP_SOURCES} )
        file(RELATIVE_PATH filename ${CMAKE_CURRENT_SOURCE_DIR} ${sourcefile})
    
        string(FIND "${filename}"  "test.cpp" "TEMP")
    if( NOT "${TEMP}" STREQUAL "-1" )
        string(REPLACE ".cpp" "" file ${filename})
        add_executable(${file}  ${APP_SOURCES})
        target_link_libraries(${file} ${Boost_LIBRARIES})
        target_link_libraries(${file}  ssl crypto libgtest.a libgtest_main.a libgmock.a pthread)
    endif()
endforeach( sourcefile ${APP_SOURCES})

gtest执行的效果如下，还是比较直观的。比自己在main函数里面写完测试再注释强点

image.png