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.
npx agentmods add skills/pproenca/dot-skills/react-testing-librarynpx skills add pproenca/dot-skills --skill react-testing-librarygit clone --depth 1 https://github.com/pproenca/dot-skillsWrote 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.
[](https://agentmods.dev/skills/pproenca/dot-skills/react-testing-library)<a href="https://agentmods.dev/skills/pproenca/dot-skills/react-testing-library"><img src="https://agentmods.dev/badge/skills/pproenca/dot-skills/react-testing-library.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00055 | $0.01589 |
| Opus 5 | $0.00028 | $0.00794 |
| Sonnet 5 | $0.00011 | $0.00318 |
| Haiku 4.5 | $0.00006 | $0.00159 |
Grade A, and why
react-testing-library 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Testing Library Best Practices
Comprehensive testing guide for React components using Testing Library, designed for AI agents and LLMs. Contains 43 rules across 9 categories, prioritized by impact to guide test writing and code review.
When to Apply
Reference these guidelines when:
- Writing new component tests with React Testing Library
- Selecting queries (getByRole, getByLabelText, etc.)
- Handling async operations in tests (findBy, waitFor)
- Simulating user interactions (userEvent)
- Reviewing tests for anti-patterns and implementation detail testing
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Query Selection | CRITICAL | query- |
| 2 | Async Handling | CRITICAL | async- |
| 3 | Common Anti-Patterns | CRITICAL | anti- |
| 4 | User Interaction | HIGH | user- |
| 5 | Assertions | HIGH | assert- |
| 6 | Component Setup | MEDIUM | setup- |
| 7 | Test Structure | MEDIUM | struct- |
| 8 | Debugging | LOW-MEDIUM | debug- |
| 9 | Accessibility Testing | LOW | a11y- |
Quick Reference
1. Query Selection (CRITICAL)
query-prefer-role- Prefer getByRole over other queriesquery-avoid-testid- Avoid getByTestId as primary queryquery-use-screen- Use screen for queriesquery-label-text-forms- Use getByLabelText for form fieldsquery-role-name-option- Use name option with getByRolequery-get-vs-query- Use getBy for present, queryBy for absentquery-within-scope- Use within() to scope queries
2. Async Handling (CRITICAL)
async-findby-over-waitfor- Use findBy instead of waitFor + getByasync-await-findby- Always await findBy queriesasync-single-assertion-waitfor- Single assertion in waitForasync-no-side-effects-waitfor- Avoid side effects in waitForasync-waitfor-disappear- Use waitForElementToBeRemoved
What ships with it
47 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.
- assets/templates/_template.md 834 B
- metadata.json 983 B
- README.md 4.4 KB
- references/_sections.md 1.7 KB
- references/a11y-role-queries-verify.md 1.6 KB
- references/a11y-test-aria-states.md 1.7 KB
- references/a11y-verify-focus.md 1.5 KB
- references/anti-container-queries.md 1.3 KB
- references/anti-empty-waitfor.md 1.3 KB
- references/anti-implementation-details.md 1.5 KB
- references/anti-manual-cleanup.md 1.2 KB
- references/anti-redundant-roles.md 1.5 KB
- references/anti-unnecessary-act.md 1.3 KB
- references/assert-accessible-description.md 1.6 KB
- references/assert-have-value.md 1.4 KB
- references/assert-jest-dom-matchers.md 1.5 KB
- references/assert-text-content.md 1.3 KB
- references/assert-visible-over-in-document.md 1.3 KB
- references/async-await-findby.md 1.1 KB
- references/async-findby-over-waitfor.md 1.3 KB
- references/async-no-side-effects-waitfor.md 1.3 KB
- references/async-single-assertion-waitfor.md 1.5 KB
- references/async-waitfor-disappear.md 1.4 KB
- references/debug-logroles.md 1.4 KB
- references/debug-screen-debug.md 1.4 KB
- references/debug-testing-playground.md 1.3 KB
- references/query-avoid-testid.md 1.1 KB
- references/query-get-vs-query.md 1.4 KB
- references/query-label-text-forms.md 1.2 KB
- references/query-prefer-role.md 1.1 KB
- references/query-role-name-option.md 1.1 KB
- references/query-use-screen.md 1.1 KB
- references/query-within-scope.md 1.4 KB
- references/setup-custom-render.md 1.8 KB
- references/setup-fake-timers.md 1.4 KB
- references/setup-mock-modules.md 1.3 KB
- references/setup-render-hook.md 1.5 KB
- references/setup-wrapper-providers.md 1.3 KB
- references/struct-arrange-act-assert.md 1.8 KB
- references/struct-avoid-beforeeach-render.md 1.5 KB
- references/struct-descriptive-names.md 1.5 KB
- references/struct-one-behavior-per-test.md 1.7 KB
- references/user-await-interactions.md 1.3 KB
- references/user-clear-before-type.md 1.2 KB
- references/user-keyboard-for-special-keys.md 1.4 KB
- references/user-prefer-userevent.md 1.3 KB
- references/user-setup-before-render.md 1.2 KB
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.
- yesterday First seen · 119 lines · 55 tokens per session scan A ed43a296b516
react-testing-library is a skill published in the GitHub repository pproenca/dot-skills (201 stars, last pushed 20d ago), licensed MIT. It adds 55 tokens to every session and 1,589 once invoked, about $0.0003 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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