准备工作

main.cpp、sum_integers.cpp和sum_integers.hpp与之前的示例相同，将更新test.cpp作为使用Boost Test库进行的单元测试：

#include "sum_integers.hpp"
#include <vector>
#define BOOST_TEST_MODULE example_test_suite
#include <boost/test/unit_test.hpp>
BOOST_AUTO_TEST_CASE(add_example)
{
  auto integers = {1, 2, 3, 4, 5};
  auto result = sum_integers(integers);
  BOOST_REQUIRE(result == 15);
}

具体实施

以下是使用Boost Test构建项目的步骤:

先从CMakeLists.txt开始: ```cmake
set minimum cmake version
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)

project name and language

project(recipe-04 LANGUAGES CXX)

require C++11

set(CMAKE_CXX_STANDARD 11) set(CMAKE_CXX_EXTENSIONS OFF) set(CMAKE_CXX_STANDARD_REQUIRED ON)

example library

add_library(sum_integers sum_integers.cpp)

main code

add_executable(sum_up main.cpp) target_link_libraries(sum_up sum_integers)


2. 
检测Boost库并将`cpp_test`链接到它:
```cmake
find_package(Boost 1.54 REQUIRED COMPONENTS unit_test_framework)
add_executable(cpp_test test.cpp)
target_link_libraries(cpp_test
  PRIVATE
    sum_integers
    Boost::unit_test_framework
  )
# avoid undefined reference to "main" in test.cpp
target_compile_definitions(cpp_test
  PRIVATE
      BOOST_TEST_DYN_LINK
  )

最后，定义单元测试: ```cmake enable_testing()

add_test( NAME boost_test COMMAND $ )



4. 
下面是需要配置、构建和测试代码的所有内容:
```shell
$ mkdir -p build
$ cd build
$ cmake ..
$ cmake --build .
$ ctest

Test project /home/user/cmake-recipes/chapter-04/recipe-04/cxx-example/build
Start 1: boost_test
1/1 Test #1: boost_test ....................... Passed 0.01 sec
100% tests passed, 0 tests failed out of 1
Total Test time (real) = 0.01 sec

$ ./cpp_test

Running 1 test case...
*** No errors detected

工作原理

使用find_package来检测Boost的unit_test_framework组件(参见第3章，第8节)。我们认为这个组件是REQUIRED的，如果在系统环境中找不到它，配置将停止。cpp_test目标需要知道在哪里可以找到Boost头文件，并且需要链接到相应的库；它们都由IMPORTED库目标Boost::unit_test_framework提供，该目标由find_package设置。

Cmake-Cookbook

4.4 使用Boost Test进行单元测试