未使用CMake项目运行Catch2单元测试

Question

我有一个结构如下的项目：

|--assets/
|--core/
    |--deps/
        |--Catch2/
             |--win32/
                  |--# Have Catch2 library installed here
    |--include/
         |--# Nothing here
    |--src/
        |--sample.cpp # No content in this file
    |--tests/
         |--test.cpp
    |--CMakeLists.txt
|--main.cpp
|--CMakeLists.txt

顶级CMakeLists.txt内容为：

cmake_minimum_required (VERSION 3.8)

set_property(GLOBAL PROPERTY USE_FOLDERS ON)
project("My.Project")

add_executable(MyProject main.cpp)

# Copy all DLLs if windows:
if(WIN32)
    file(GLOB_RECURSE DYNAMIC_LIBS "${CMAKE_CURRENT_SOURCE_DIR}/*.dll")
    foreach(dll ${DYNAMIC_LIBS})
        add_custom_command(TARGET AZTEC_EDITOR POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy
            ${dll} $<TARGET_FILE_DIR:AZTEC_EDITOR>)
    endforeach()
else(APPLE)
endif()

add_subdirectory(core)
target_link_libraries(MyProject MyLib)

“核心”文件夹中的CMakeLists.txt文件是：

file(GLOB HEADER_FILES "${CMAKE_CURRENT_SOURCE_DIR}/include/*.h")
file(GLOB SOURCE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")
file(GLOB TEST_FILES "${CMAKE_CURRENT_SOURCE_DIR}/tests/*.cpp")

add_library(MyLib ${HEADER_FILES} ${SOURCE_FILES} ${TEST_FILES})

target_include_directories(MyLib PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")

# Copy all DLLs if windows:
if(WIN32)
    file(GLOB_RECURSE DYNAMIC_LIBS "${CMAKE_CURRENT_SOURCE_DIR}/*.dll")
    foreach(dll ${DYNAMIC_LIBS})
        add_custom_command(TARGET AZTEC_EDITOR_CORE POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy
            ${dll} $<TARGET_FILE_DIR:AZTEC_EDITOR_CORE>)
    endforeach()
else(APPLE)
endif()

# Catch2 stuff:
if(WIN32)
    find_package(Catch2 REQUIRED PATHS "${CMAKE_CURRENT_SOURCE_DIR}/deps/catch2/win32")
    target_link_libraries(MyLib Catch2::Catch2)
endif()

include(CTest)
include(Catch)
catch_discover_tests(MyLib)

我的test.cpp内容(来自Catch2文档，此测试应该失败)：

#define CATCH_CONFIG_MAIN
#include "catch2/catch.hpp"

unsigned int Factorial(unsigned int number)
{
    return number <= 1 ? number : Factorial(number - 1)*number;
}

TEST_CASE("Factorials are computed", "[factorial]")
{
    REQUIRE(Factorial(1) == 2); // Should fail here.
    REQUIRE(Factorial(2) == 2);
    REQUIRE(Factorial(3) == 6);
    REQUIRE(Factorial(10) == 3628800);
}

当我使用cmake -G "Visual Studio 15" . -B .\build生成Visual Studio文件时，通常，当发现测试时，我会看到一个分组在"CMakePredefinedTargets“下的名为"RUN_TESTS”的项目。然而，我再也看不到这个项目了。

此外，当我构建项目时(使用Visual Studio 2017)，测试没有运行。请帮帮忙。谢谢。

Answer 1

基于@Stephen Newell和@squareskittle的评论，我最终修改的工作CMakeLists.txt文件如下所示。

我将enable_testing()添加到根文件中。这将使RUN_TESTS项目在Visual Studio中可见。当我想运行测试时，我会构建这个项目：

cmake_minimum_required (VERSION 3.8)

set_property(GLOBAL PROPERTY USE_FOLDERS ON)
project("My.Project")

enable_testing()

add_executable(MyProject main.cpp)

# Copy all DLLs if windows:
if(WIN32)
    file(GLOB_RECURSE DYNAMIC_LIBS "${CMAKE_CURRENT_SOURCE_DIR}/*.dll")
    foreach(dll ${DYNAMIC_LIBS})
        add_custom_command(TARGET AZTEC_EDITOR POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy
            ${dll} $<TARGET_FILE_DIR:AZTEC_EDITOR>)
    endforeach()
else(APPLE)
endif()

add_subdirectory(core)
target_link_libraries(MyProject MyLib)

然而，仅仅添加这一行仍然会留下一个问题，即使RUN_TESTS在那里，它也没有发现单元测试，因为CMake-Catch2集成需要一个可执行文件，而不是一个库来运行测试。因此，我在核心文件夹的CMakeLists.txt文件中添加了一个单独的目标：

file(GLOB HEADER_FILES "${CMAKE_CURRENT_SOURCE_DIR}/include/*.h")
file(GLOB SOURCE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/src/*.cpp")

add_library(MyLib ${HEADER_FILES} ${SOURCE_FILES})

target_include_directories(MyLib PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/include")

# Copy all DLLs if windows:
if(WIN32)
    file(GLOB_RECURSE DYNAMIC_LIBS "${CMAKE_CURRENT_SOURCE_DIR}/*.dll")
    foreach(dll ${DYNAMIC_LIBS})
        add_custom_command(TARGET AZTEC_EDITOR_CORE POST_BUILD
            COMMAND ${CMAKE_COMMAND} -E copy
            ${dll} $<TARGET_FILE_DIR:AZTEC_EDITOR_CORE>)
    endforeach()
else(APPLE)
endif()

# Catch2 stuff:
file(GLOB TEST_FILES "${CMAKE_CURRENT_SOURCE_DIR}/tests/*.cpp")
add_executable(MyLibTests ${TEST_FILES})

if(WIN32)
    find_package(Catch2 REQUIRED PATHS "${CMAKE_CURRENT_SOURCE_DIR}/deps/catch2/win32")
    target_link_libraries(MyLibTests Catch2::Catch2)
endif()

include(CTest)
include(Catch)
catch_discover_tests(MyLibTests)

由于Catch2文档中给出的示例非常少，因此希望这能帮助那些试图将Catch2与更复杂的项目结构集成在一起的人。感谢评论员们的帮助。