GoogleTest: Submodule method (preferred)

To use this method, just checkout GoogleTest as a submodule:¹

git submodule add --branch=release-1.8.0 ../../google/googletest.git extern/googletest

Then, in your main CMakeLists.txt:

option(PACKAGE_TESTS "Build the tests" ON)
if(PACKAGE_TESTS)
    enable_testing()
    add_subdirectory(tests)
endif()

As mentioned before, you have to do the enable_testing in your main CMakeLists. Now, in your tests directory:

add_subdirectory("${PROJECT_SOURCE_DIR}/extern/googletest" "extern/googletest")

If you did this in your main CMakeLists, you could use a normal add_subdirectory; the extra path here is needed to correct the build path because we are calling it from a subdirectory.

The next line is optional, but keeps your CACHE cleaner:

mark_as_advanced(
    BUILD_GMOCK BUILD_GTEST BUILD_SHARED_LIBS
    gmock_build_tests gtest_build_samples gtest_build_tests
    gtest_disable_pthreads gtest_force_shared_crt gtest_hide_internal_symbols
)

If you are interested in keeping IDEs that support folders clean, I would also add these lines:

set_target_properties(gtest PROPERTIES FOLDER extern)
set_target_properties(gtest_main PROPERTIES FOLDER extern)
set_target_properties(gmock PROPERTIES FOLDER extern)
set_target_properties(gmock_main PROPERTIES FOLDER extern)

Then, to add a test, I'd recommend the following macro:

macro(package_add_test TESTNAME)
    add_executable(${TESTNAME} ${ARGN})
    target_link_libraries(${TESTNAME} gtest gmock gtest_main)
    add_test(${TESTNAME} ${TESTNAME})
    set_target_properties(${TESTNAME} PROPERTIES FOLDER tests)
endmacro()

package_add_test(test1 test1.cpp)

This will allow you to quickly and simply add tests. Feel free to adjust to suit your needs. If you haven't seen it before, ARGN is "every argument after the listed ones".

Here I've assumed that you are working on a GitHub repository by using the relative path to googletest. ↩︎

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GoogleTest: Submodule method (preferred)

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