CMakeでgoogle testを使えるようにする

cmake_minimum_required(VERSION 3.18)
project(my_project)

set(CMAKE_CXX_STANDARD 20)

include(FetchContent)
FetchContent_Declare(
    googletest
    URL https://github.com/google/googletest/archive/refs/tags/release-1.12.1.zip
)

FetchContent_MakeAvailable(googletest)

enable_testing()

add_executable(
  hello_test
  hello_test.cpp
)

target_link_libraries(
  hello_test
  GTest::gtest_main
)

include(GoogleTest)
gtest_discover_tests(hello_test)

#include <gtest/gtest.h>

// Demonstrate some basic assertions.
TEST(HelloTest, BasicAssertions) {
  // Expect two strings not to be equal.
  EXPECT_STRNE("hello", "world");
  // Expect equality.
  EXPECT_EQ(7 * 6, 42);
}

$ cmake -S . -B build
$ cmake --build build
$ cd build
$ ctest
Test project /usr/src/build
    Start 1: HelloTest.BasicAssertions
1/1 Test #1: HelloTest.BasicAssertions ........   Passed    0.00 sec

100% tests passed, 0 tests failed out of 1

Total Test time (real) =   0.00 sec