使用 GTest 的 CMake 无法正常工作

Question

我试图使用 googletest 设置 CMake C++ 项目。我对 CMake 并没有真正的经验并使用过这个指南来创建我自己的设置。

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当尝试构建项目时，编译器会抛出错误：

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.../test.cpp:12:5: error: \xe2\x80\x98EXPECT_THAT\xe2\x80\x99 was not declared in this scope\n     EXPECT_THAT(a, ContainerEq(b));\n     ^~~~~~~~~~~\n.../test.cpp:12:5: note: suggested alternative: \xe2\x80\x98EXPECT_GT\xe2\x80\x99\n     EXPECT_THAT(a, ContainerEq(b));\n     ^~~~~~~~~~~\n     EXPECT_GT\n../test.cpp:13:31: error: \xe2\x80\x98ContainerEq\xe2\x80\x99 is not a member of \xe2\x80\x98testing\xe2\x80\x99\n     EXPECT_THAT(a, ::testing::ContainerEq(b)); // doesn\'t work either\n

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不过 GTest 的某些部分似乎工作正常。如果我注释掉第二个测试，一切都会正常。

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文件夹结构：

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• CMakeLists.txt
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• 测试/\n\n
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  • CMakeLists.txt
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  • gtest.cmake
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  • 测试.cpp
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顶级 CMakeLists.txt

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cmake_minimum_required (VERSION 3.8)\nproject (TestProject)\nenable_testing()\nadd_subdirectory(test)\n

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测试/CMakeLists.txt

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include(gtest.cmake)\nadd_executable(UnitTests test.cpp)\ntarget_link_libraries(UnitTests libgtest)\nadd_test(NAME AllUnitTests COMMAND UnitTests)\n

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测试/gtest.cmake

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find_package(Threads REQUIRED)\n\n# Enable ExternalProject CMake module\ninclude(ExternalProject)\n\n# Download and install GoogleTest\nExternalProject_Add(\n    gtest\n    URL https://github.com/google/googletest/archive/master.zip\n    PREFIX ${CMAKE_CURRENT_BINARY_DIR}/gtest\n    # Disable install step\n    INSTALL_COMMAND ""\n)\n\n# Get GTest source and binary directories from CMake project\nExternalProject_Get_Property(gtest source_dir binary_dir)\n\n# Create a libgtest target to be used as a dependency by test programs\nadd_library(libgtest IMPORTED STATIC GLOBAL)\nadd_dependencies(libgtest gtest)\n\n# Set libgtest properties\nset_target_properties(libgtest PROPERTIES\n    "IMPORTED_LOCATION" "${binary_dir}/googlemock/gtest/libgtest.a"\n    "IMPORTED_LINK_INTERFACE_LIBRARIES" "${CMAKE_THREAD_LIBS_INIT}"\n)\n\n# Create a libgmock target to be used as a dependency by test programs\nadd_library(libgmock IMPORTED STATIC GLOBAL)\nadd_dependencies(libgmock gtest)\n\n# Set libgmock properties\nset_target_properties(libgmock PROPERTIES\n    "IMPORTED_LOCATION" "${binary_dir}/googlemock/libgmock.a"\n    "IMPORTED_LINK_INTERFACE_LIBRARIES" "${CMAKE_THREAD_LIBS_INIT}"\n)\n\n# I couldn\'t make it work with INTERFACE_INCLUDE_DIRECTORIES\ninclude_directories("${source_dir}/googletest/include"\n                    "${source_dir}/googlemock/include")\n

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测试/测试.cpp

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#include <vector>\n#include "gtest/gtest.h"\n\nTEST(SampleTest, Equal){\n    EXPECT_EQ(42, 42);\n}\n\nTEST(ContainerComparison, Equal){\n    const std::vector<int> a(2, 1);\n    const std::vector<int> b(2, 1);\n\n    EXPECT_THAT(a, ContainerEq(b));\n    EXPECT_THAT(a, ::testing::ContainerEq(b)); // doesn\'t work either\n}\n\nint main(int argc, char** argv){\n    ::testing::InitGoogleTest(&argc, argv);\n    int ret = RUN_ALL_TESTS();\n    return ret;\n}\n

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Answer 1

匹配器是 GMock 的一部分。您需要包含它（并链接到它的库）。

#include <gmock/gmock.h>

GMock 曾经是一个独立的库，现在已合并到 GoogleTest 存储库中。然而它有单独的包含和库。

您正在关注的教程是 2014 年的。您可以在GoogleTest GitHub 存储库中找到不错的最新教程。