unity-ceedling-integration

unity-ceedling-integration is a skill for Claude Code, Codex from easyzoom/aix-skills. It costs 41 tokens per session (662 once invoked), scanned A, original, MIT.

A guide for writing embedded C unit tests with Unity, Ceedling, and CMock. Unit tests check small parts of a program separately, while mocks replace hardware or other dependencies.

In plain words
What is it for?
Use it for tests of C firmware, drivers, protocol parsers, state machines, and business logic, especially when code depends on hardware registers or vendor libraries.
Why use it?
It helps test firmware logic without requiring the real device for every test and helps resolve problems with builds, mocks, fixtures, coverage, and continuous integration.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it for tests of C firmware, drivers, protocol parsers, state machines, and business logic, especially when code depends on hardware registers or vendor libraries.

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Install with agentmods
npx agentmods add skills/easyzoom/aix-skills/unity-ceedling-integration
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add easyzoom/aix-skills --skill unity-ceedling-integration
Clone the repo
git clone --depth 1 https://github.com/easyzoom/aix-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for unity-ceedling-integration

README.md
[![agentmods](https://agentmods.dev/badge/skills/easyzoom/aix-skills/unity-ceedling-integration.svg)](https://agentmods.dev/skills/easyzoom/aix-skills/unity-ceedling-integration)
Your own site
<a href="https://agentmods.dev/skills/easyzoom/aix-skills/unity-ceedling-integration"><img src="https://agentmods.dev/badge/skills/easyzoom/aix-skills/unity-ceedling-integration.svg" alt="Measured on agentmods" height="20"></a>
Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 662 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00041 $0.00662
Opus 5 $0.00020 $0.00331
Sonnet 5 $0.00008 $0.00132
Haiku 4.5 $0.00004 $0.00066

Measured 4d ago against content hash 2e1fe6f263a9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

unity-ceedling-integration scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/unity-ceedling-integration/SKILL.md · 83 lines

How it starts

The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Unity Ceedling Integration

Overview

Use this skill to add embedded C tests with Unity assertions, Ceedling builds, and CMock-generated mocks while keeping hardware code behind clear seams. Good embedded tests isolate logic from registers, clocks, and interrupts without pretending the hardware does not exist.

When To Use

Use this skill when:

  • The user wants unit tests for C firmware, drivers, protocol parsers, state machines, or business logic.
  • The issue involves Ceedling project setup, include paths, mocks, fixtures, test runners, coverage, or CI.
  • The codebase uses vendor HALs, RTOS wrappers, static functions, compile-time flags, or hardware registers.

Do not use this skill for hardware-in-the-loop validation alone. Pair it with the relevant hardware or protocol skill.

First Questions

Ask for:

  • Toolchain, host OS, Ceedling version, compiler, and CI environment.
  • Code under test, dependencies, include paths, and hardware/HAL boundaries.
  • Whether mocks, fakes, or real modules should be used.
  • Build variants, configuration headers, and preprocessor flags.
  • Current failing command and full test output.

Integration Checklist

  1. Identify testable units. Start with pure logic, parsers, state machines, and error handling before register-level code.

  2. Define hardware boundaries. Wrap HAL calls, RTOS calls, time, logging, and storage behind interfaces that can be mocked or faked.

  3. Configure Ceedling deliberately. Set source paths, include paths, defines, vendor files, and plugins in project.yml.

  4. Write tests around behavior. Prefer input/output and state transitions over checking private implementation details.

  5. Use CMock where it clarifies intent. Mock external collaborators, but use small fakes for stateful dependencies when expectations become brittle.

  6. Add CI and coverage last. Keep the command non-interactive and fast enough to run on every change.

Common Failures

  • Tests include vendor headers that require target-only compiler extensions.
  • Static functions are tested directly instead of through behavior.
  • Mocks over-specify call order and make refactors painful.
  • Configuration macros differ between tests and firmware builds.
  • Global state is not reset in setUp or tearDown.
  • CI uses a different Ruby, compiler, or path layout than local runs.

Read the full file on GitHub · 83 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 4d ago First seen · 83 lines · 41 tokens per session scan A 2e1fe6f263a9

Subscribe to this mod's changes

unity-ceedling-integration is a skill published in the GitHub repository easyzoom/aix-skills (31 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 662 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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