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C++ Testing (Agent Skill) · loulanyue | DecimalAI

testingby loulanyue

C++ Testing (Agent Skill)

loulanyue/cpp-testing

Source loulanyue/awesome-claude-notes ↗License MIT

C++ テストの作成/更新/修正、GoogleTest/CTest の設定、失敗またはフレーキーなテストの診断、カバレッジ/サニタイザーの追加時にのみ使用します。

NewMaintained

Automatic

QA & Test Engineering pack

Last verified 8/22/2026

What it changes

Passed 18 of 22 test cases with the skill, and 18 of 22 without it.

Without skill82%

With skill82%

Checks it passed that the model alone missed

Specifies tests/testdata for test static data.
Includes --output-on-failure in CTest execution commands.
Advises against reading system wall clock time directly inside unit tests.

3 fixed15 passed either way1 still failing3 broke

Pass-rate lift: 0 pp
Tokens: +99%
Agent turns: 0%
Response time: -22%

Model gemini-3.6-flashMeasured 8/22/2026v618 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/loulanyue-cpp-testing/SKILL.md https://app.decimal.ai/s/loulanyue-cpp-testing/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add loulanyue-cpp-testing, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/loulanyue-cpp-testing/ and pins it in .decimal/skills.lock

decimalai skills add loulanyue-cpp-testing

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/loulanyue-cpp-testing/SKILL.md https://app.decimal.ai/s/loulanyue-cpp-testing/SKILL.md

Raw file: /s/loulanyue-cpp-testing/SKILL.md ↗ · machine-readable summary at /s/loulanyue-cpp-testing.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 3

Prompt

A function checks whether a user token has expired using std::chrono::system_clock::now(). How should we design this component and its test to avoid flaky time-dependent test failures?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends injecting a clock interface or fake time source into the function.	Passed	Passed
Advises against reading system wall clock time directly inside unit tests.	Missed	Passed

case-11 · gemini-3.6-flash · 8/22/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md325 linessingle file

C++ Testing (Agent Skill)

Agent-focused testing workflow for modern C++ (C++17/20) using GoogleTest/GoogleMock with CMake/CTest.

When to Use

Writing new C++ tests or fixing existing tests
Designing unit/integration test coverage for C++ components
Adding test coverage, CI gating, or regression protection
Configuring CMake/CTest workflows for consistent execution
Investigating test failures or flaky behavior
Enabling sanitizers for memory/race diagnostics

When NOT to Use

Implementing new product features without test changes
Large-scale refactors unrelated to test coverage or failures
Performance tuning without test regressions to validate
Non-C++ projects or non-test tasks

Core Concepts

TDD loop: red → green → refactor (tests first, minimal fix, then cleanups).
Isolation: prefer dependency injection and fakes over global state.
Test layout: tests/unit, tests/integration, tests/testdata.
Mocks vs fakes: mock for interactions, fake for stateful behavior.
CTest discovery: use gtest_discover_tests() for stable test discovery.
CI signal: run subset first, then full suite with --output-on-failure.

TDD Workflow

Follow the RED → GREEN → REFACTOR loop:

RED: write a failing test that captures the new behavior
GREEN: implement the smallest change to pass
REFACTOR: clean up while tests stay green

// tests/add_test.cpp
#include <gtest/gtest.h>

Track record

Benchmark

18 / 22

test cases passed, vs 18 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

loulanyue / awesome-claude-notes

docs/ja-JP/skills/cpp-testing/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v6

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See it in action

What's inside

C++ Testing (Agent Skill)

When to Use

When NOT to Use

Core Concepts

TDD Workflow

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

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