Assists writing, fixing, configuring C++ tests with GoogleTest/GoogleMock and CMake/CTest. Diagnoses flaky tests, failures, and adds coverage/sanitizers.
From atum-systemnpx claudepluginhub arnwaldn/atum-system --plugin atum-systemThis skill uses the workspace's default tool permissions.
Provides UI/UX resources: 50+ styles, color palettes, font pairings, guidelines, charts for web/mobile across React, Next.js, Vue, Svelte, Tailwind, React Native, Flutter. Aids planning, building, reviewing interfaces.
Fetches up-to-date documentation from Context7 for libraries and frameworks like React, Next.js, Prisma. Use for setup questions, API references, and code examples.
Integrates PayPal payments with express checkout, subscriptions, refunds, and IPN. Includes JS SDK for frontend buttons and Python REST API for backend capture.
Agent-focused testing workflow for modern C++ (C++17/20) using GoogleTest/GoogleMock with CMake/CTest.
tests/unit, tests/integration, tests/testdata.gtest_discover_tests() for stable test discovery.--output-on-failure.Follow the RED → GREEN → REFACTOR loop:
// tests/add_test.cpp
#include <gtest/gtest.h>
int Add(int a, int b); // Provided by production code.
TEST(AddTest, AddsTwoNumbers) { // RED
EXPECT_EQ(Add(2, 3), 5);
}
// src/add.cpp
int Add(int a, int b) { // GREEN
return a + b;
}
// REFACTOR: simplify/rename once tests pass
// tests/calculator_test.cpp
#include <gtest/gtest.h>
int Add(int a, int b); // Provided by production code.
TEST(CalculatorTest, AddsTwoNumbers) {
EXPECT_EQ(Add(2, 3), 5);
}
// tests/user_store_test.cpp
// Pseudocode stub: replace UserStore/User with project types.
#include <gtest/gtest.h>
#include <memory>
#include <optional>
#include <string>
struct User { std::string name; };
class UserStore {
public:
explicit UserStore(std::string /*path*/) {}
void Seed(std::initializer_list<User> /*users*/) {}
std::optional<User> Find(const std::string &/*name*/) { return User{"alice"}; }
};
class UserStoreTest : public ::testing::Test {
protected:
void SetUp() override {
store = std::make_unique<UserStore>(":memory:");
store->Seed({{"alice"}, {"bob"}});
}
std::unique_ptr<UserStore> store;
};
TEST_F(UserStoreTest, FindsExistingUser) {
auto user = store->Find("alice");
ASSERT_TRUE(user.has_value());
EXPECT_EQ(user->name, "alice");
}
// tests/notifier_test.cpp
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include <string>
class Notifier {
public:
virtual ~Notifier() = default;
virtual void Send(const std::string &message) = 0;
};
class MockNotifier : public Notifier {
public:
MOCK_METHOD(void, Send, (const std::string &message), (override));
};
class Service {
public:
explicit Service(Notifier ¬ifier) : notifier_(notifier) {}
void Publish(const std::string &message) { notifier_.Send(message); }
private:
Notifier ¬ifier_;
};
TEST(ServiceTest, SendsNotifications) {
MockNotifier notifier;
Service service(notifier);
EXPECT_CALL(notifier, Send("hello")).Times(1);
service.Publish("hello");
}
# CMakeLists.txt (excerpt)
cmake_minimum_required(VERSION 3.20)
project(example LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
include(FetchContent)
# Prefer project-locked versions. If using a tag, use a pinned version per project policy.
set(GTEST_VERSION v1.17.0) # Adjust to project policy.
FetchContent_Declare(
googletest
# Google Test framework (official repository)
URL https://github.com/google/googletest/archive/refs/tags/${GTEST_VERSION}.zip
)
FetchContent_MakeAvailable(googletest)
add_executable(example_tests
tests/calculator_test.cpp
src/calculator.cpp
)
target_link_libraries(example_tests GTest::gtest GTest::gmock GTest::gtest_main)
enable_testing()
include(GoogleTest)
gtest_discover_tests(example_tests)
cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug
cmake --build build -j
ctest --test-dir build --output-on-failure
ctest --test-dir build --output-on-failure
ctest --test-dir build -R ClampTest
ctest --test-dir build -R "UserStoreTest.*" --output-on-failure
./build/example_tests --gtest_filter=ClampTest.*
./build/example_tests --gtest_filter=UserStoreTest.FindsExistingUser
Prefer target-level settings instead of global flags.
option(ENABLE_COVERAGE "Enable coverage flags" OFF)
if(ENABLE_COVERAGE)
if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
target_compile_options(example_tests PRIVATE --coverage)
target_link_options(example_tests PRIVATE --coverage)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
target_compile_options(example_tests PRIVATE -fprofile-instr-generate -fcoverage-mapping)
target_link_options(example_tests PRIVATE -fprofile-instr-generate)
endif()
endif()
GCC + gcov + lcov:
cmake -S . -B build-cov -DENABLE_COVERAGE=ON
cmake --build build-cov -j
ctest --test-dir build-cov
lcov --capture --directory build-cov --output-file coverage.info
lcov --remove coverage.info '/usr/*' --output-file coverage.info
genhtml coverage.info --output-directory coverage
Clang + llvm-cov:
cmake -S . -B build-llvm -DENABLE_COVERAGE=ON -DCMAKE_CXX_COMPILER=clang++
cmake --build build-llvm -j
LLVM_PROFILE_FILE="build-llvm/default.profraw" ctest --test-dir build-llvm
llvm-profdata merge -sparse build-llvm/default.profraw -o build-llvm/default.profdata
llvm-cov report build-llvm/example_tests -instr-profile=build-llvm/default.profdata
option(ENABLE_ASAN "Enable AddressSanitizer" OFF)
option(ENABLE_UBSAN "Enable UndefinedBehaviorSanitizer" OFF)
option(ENABLE_TSAN "Enable ThreadSanitizer" OFF)
if(ENABLE_ASAN)
add_compile_options(-fsanitize=address -fno-omit-frame-pointer)
add_link_options(-fsanitize=address)
endif()
if(ENABLE_UBSAN)
add_compile_options(-fsanitize=undefined -fno-omit-frame-pointer)
add_link_options(-fsanitize=undefined)
endif()
if(ENABLE_TSAN)
add_compile_options(-fsanitize=thread)
add_link_options(-fsanitize=thread)
endif()
sleep for synchronization; use condition variables or latches.ASSERT_* for preconditions, EXPECT_* for multiple checksOnly use if the project already supports LLVM/libFuzzer or a property-testing library.
Minimal libFuzzer harness (pseudocode: replace ParseConfig):
#include <cstddef>
#include <cstdint>
#include <string>
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
std::string input(reinterpret_cast<const char *>(data), size);
// ParseConfig(input); // project function
return 0;
}