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testing-expert

testing-expert is a skill for Claude Code, Codex from jggomez/expert-ai-developer-skills. It costs 50 tokens per session (1,097 once invoked), scanned A, original, Apache-2.0.

Design and validate automated tests, concise IEEE/ISTQB TC-XX test cases, hermetic Arrange-Act-Assert (AAA) suites, Gherkin BDD scenarios, and Fail-Honest execution reporting across languages.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions Claude Code.

not rated 30repo yesterday A scan 50 tokens original Apache-2.0
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Install with agentmods
npx agentmods add skills/jggomez/expert-ai-developer-skills/testing-expert
View source ↗ jggomez/expert-ai-developer-skills
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 jggomez/expert-ai-developer-skills --skill testing-expert
Clone the repo
git clone --depth 1 https://github.com/jggomez/expert-ai-developer-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 testing-expert

README.md
[![agentmods](https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/testing-expert/github.svg)](https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/testing-expert)
Your own site
<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/testing-expert"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/testing-expert/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for testing-expert

Your own site · 80×15
<a href="https://agentmods.dev/skills/jggomez/expert-ai-developer-skills/testing-expert"><img src="https://agentmods.dev/badge/skills/jggomez/expert-ai-developer-skills/testing-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,097 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 $0.00050 $0.01097
Opus 5.5 $0.00020 $0.00439
Sonnet 5.5 $0.00010 $0.00219
Haiku 4.5 $0.00005 $0.00110

Measured today against content hash 1bba03cdf565, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

testing-expert 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 today.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/validate_gherkin.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/antigravity/docs-and-quality/skills/testing-expert/SKILL.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Testing Expert Skill

Overview

This skill guides the design, structuring, and validation of hermetic automated tests, Gherkin BDD specifications, and concise IEEE/ISTQB test cases (TC-XX). Acting as a Lead QA Architect, it enforces Arrange-Act-Assert (AAA) isolation, boundary mocking, concise docs/<feature-name>/test-matrix.md (<= 80 lines) traceability, and strict Fail-Honest execution reporting.

When to Use

Trigger Scenarios

  • Designing unit, integration, component, and E2E test cases (TC-XX) with explicit Objective, Steps, and Expected Result.
  • Authoring and validating Gherkin BDD .feature files (Given / When / Then / Examples).
  • Structuring hermetic Arrange-Act-Assert (AAA) test suites with isolated boundary mocks.
  • Auditing test outcomes to enforce Fail-Honest BLOCKED / SKIPPED reporting when environments are unavailable.

When NOT to Use

  • Inner-loop TDD production code authoring: Route to test-driven-development or code-implementer.
  • Full State 3 QA execution & matrix sign-off: Route to qa-tester.
  • Live Playwright browser journey & viewport screenshot capture: Route to blackbox-tester (e2e-blackbox-tester).

Process

Phase 1: Concise IEEE/ISTQB TC-XX & Gherkin BDD Design

  1. Define each test case (TC-01, TC-02, ...) concisely for docs/<feature-name>/test-matrix.md (<= 80 lines):
    • Objective: Single behavior, invariant, or boundary under verification.
    • Steps: Deterministic precondition + action (Given/When or concise numbered steps).
    • Expected Result: Observable output, state transition, or error contract (Then).
    • Automated Test & Status: Linked test path/symbol and empirical status (PASSED, FAILED, BLOCKED, SKIPPED).
  2. When authoring .feature specs, use clean Feature, Background, Scenario, and Scenario Outline + Examples tables.

Phase 2: Hermetic Arrange-Act-Assert (AAA) & Fail-Honest Execution

  1. Partition every test into Arrange (fixtures + boundary mocks), Act (single invocation), and Assert (exact behavioral check) with zero shared mutable state across tests.
  2. Fail-Honest Rule: If a test runner, database service, live web server, or Chromium/Playwright binary cannot run in the current environment, report BLOCKED or SKIPPED with the exact missing prerequisite — never stub assertions, relax thresholds, or fabricate PASSED.

Read the full file on GitHub · 70 lines

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. today First seen · 70 lines · 50 tokens per session scan A 1bba03cdf565

Subscribe to this mod's changes

testing-expert is a skill published in the GitHub repository jggomez/expert-ai-developer-skills (30 stars, last pushed yesterday), licensed Apache-2.0. It adds 50 tokens to every session and 1,097 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-11-06.

TestingWriting and docs
Related

testing-expert compared with skills from other repositories

testing-expert next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
testing-expertjggomez/expert-ai-developer-skillsSkill30yesterdayApache-2.0A50Claude Code, Codex
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code