在 cmake 中使用 REQUIRED_FILES 进行单元测试答案

【问题标题】：Using REQUIRED_FILES for unit tests in cmake在 cmake 中使用 REQUIRED_FILES 进行单元测试
【发布时间】：2018-08-06 17:55:23
【问题描述】：

尝试使用REQUIRED_FILES的非常简短的示例：

$ tree .
.
├── CMakeLists.txt
└── main.cxx

$ cat main.cxx 
int main() { return 0; }

$ cat CMakeLists.txt 
cmake_minimum_required(VERSION 3.10)

add_executable(a.out main.cxx)

include(CTest)
add_test(NAME a.out COMMAND a.out)
set_property(TEST a.out PROPERTY REQUIRED_FILES $<TARGET_FILE:a.out>)

一个可执行文件，它什么都不做，是一个只需要自身存在的测试。

$ mkdir build && cd build && cmake .. && ctest
-- The C compiler identification is GNU 4.8.5
-- The CXX compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/lib64/ccache/cc
-- Check for working C compiler: /usr/lib64/ccache/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/lib64/ccache/c++
-- Check for working CXX compiler: /usr/lib64/ccache/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /[...]/req/build
Test project /[...]/req/build
    Start 1: a.out
Could not find executable /[...]/req/build/a.out
Looked in the following places:
/[...]/req/build/a.out
/[...]/req/build/a.out
/[...]/req/build/Release/a.out
/[...]/req/build/Release/a.out
/[...]/req/build/Debug/a.out
/[...]/req/build/Debug/a.out
/[...]/req/build/MinSizeRel/a.out
/[...]/req/build/MinSizeRel/a.out
/[...]/req/build/RelWithDebInfo/a.out
/[...]/req/build/RelWithDebInfo/a.out
/[...]/req/build/Deployment/a.out
/[...]/req/build/Deployment/a.out
/[...]/req/build/Development/a.out
/[...]/req/build/Development/a.out
[...]/req/build/a.out
[...]/req/build/a.out
[...]/req/build/Release/a.out
[...]/req/build/Release/a.out
[...]/req/build/Debug/a.out
[...]/req/build/Debug/a.out
[...]/req/build/MinSizeRel/a.out
[...]/req/build/MinSizeRel/a.out
[...]/req/build/RelWithDebInfo/a.out
[...]/req/build/RelWithDebInfo/a.out
[...]/req/build/Deployment/a.out
[...]/req/build/Deployment/a.out
[...]/req/build/Development/a.out
[...]/req/build/Development/a.out
Unable to find required file: /[...]/req/build/a.out
1/1 Test #1: a.out ............................***Not Run   0.00 sec

0% tests passed, 1 tests failed out of 1

Total Test time (real) =   0.00 sec

The following tests FAILED:
      1 - a.out (Not Run)
Errors while running CTest

我认为REQUIRED_FILES 的目的是避免运行此测试，因为该文件不存在，因此 not 测试失败。实际使用此属性的正确方法是什么？

【问题讨论】：

标签： cmake ctest

【解决方案1】：

您正在正确使用该属性，因为 ctest 实际上并未运行测试。 CTest 无法将测试标记为成功，因为它没有运行，并且由于需要文件，因此不会将测试标记为失败，因此它将测试放在Not Run bin 中。

至于为什么没有找到需要的文件，那是因为没有构建a.out二进制文件。您的脚本中缺少一个步骤：

mkdir build && cd build && cmake .. && cmake --build . && ctest

您还可以将脚本简化为：

【讨论】：