Test Guidelines
getsentry/sentry-react-native
Enforce Sentry React Native SDK test conventions for naming, structure, mocking, and fixtures with Jest.
Increase test coverage to 90% on a target zone with iterative writing and refactoring
Install Test Coverage
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install LedgerHQ/ledger-live test-coverage --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/test-coverage .claude/skills/test-coverage && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .claude/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverageType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install LedgerHQ/ledger-live test-coverage --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/test-coverage .agents/skills/test-coverage && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .agents/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install LedgerHQ/ledger-live test-coverage --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/test-coverage .cursor/skills/test-coverage && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .cursor/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/LedgerHQ/ledger-live.git --path .agents/skills/test-coverage--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install LedgerHQ/ledger-live test-coverage --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/test-coverage .gemini/skills/test-coverage && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .gemini/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install LedgerHQ/ledger-live test-coverageInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/test-coverage .github/skills/test-coverage && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .github/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add LedgerHQ/ledger-live --skill test-coverage -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install LedgerHQ/ledger-live test-coverage --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LedgerHQ/ledger-live.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/test-coverage .opencode/skills/test-coverage && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "test-coverage" agent skill from https://github.com/LedgerHQ/ledger-live/tree/develop/.agents/skills/test-coverage into .opencode/skills/test-coverage/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-coverage", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
test-coverage- GitHub stars
- 622
- Token cost
- ~776 tokens
- SKILL.md length
- 383 words
- Files
- 1
- Skills in repo
- 50
- Repo updated
- First seen
- Licence
- MIT
At a glance
Increase test coverage to 90% on a target zone with iterative writing and refactoring
- Works in 4 steps: Scope and Analyze → Write Tests → Refactoring Loop → …
- Tasks that involve Test coverage
- SKILL.md covers Prompt Variables and Instructions
- Calls pnpm; reaches ledgerhq.atlassian.net
What it does
Test Coverage is an agent skill from LedgerHQ/ledger-live. Increase test coverage to 90% on a target zone with iterative writing and refactoring
Its SKILL.md is about 780 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Testing & QA, covering Test coverage and Refactoring. It works with Jest. The repository describes itself as: Mono-repository for Ledger Wallet apps and related packages. The licence is MIT.
When your agent uses it
- Tasks that involve Test coverage
- Tasks that involve Refactoring
Example prompts
- “/test-coverage”
Workflow steps
4 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 30d7883. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
pnpm
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
ledgerhq.atlassian.net
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Test Coverage loads about 776 tokens when it runs. Until then it costs about 25 tokens; SKILL.md has 383 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from LedgerHQ/ledger-live at commit 30d7883, republished under its MIT licence (© LedgerHQ). 383 words, ~776 tokens.
Download SKILL.mdSave it as
.claude/skills/test-coverage/SKILL.md (or your agent's skills folder).- name
- test-coverage
- description
- Increase test coverage to 90% on a target zone with iterative writing and refactoring
- disable-model-invocation
- true
Test Coverage
Increase test coverage to 90% on a target zone with iterative writing and refactoring.
Prompt Variables
$TARGET_ZONE
Directory path or Jira ticket URL for the zone to cover (e.g.,
src/mvvm/features/Accounts/orhttps://ledgerhq.atlassian.net/browse/LIVE-1234)
Instructions
Follow all conventions from the testing skill (.agents/skills/testing/SKILL.md).
Delegate test execution to the test-runner subagent throughout.
Step 1: Scope and Analyze
- If
$TARGET_ZONEis a Jira URL, fetch the ticket via Atlassian MCP and extract affected files. - Use
code-explorersubagent to analyze the zone: trace execution paths, map dependencies, and identify branching logic worth testing. - Measure current coverage:
bash pnpm <mobile|desktop> test:jest --coverage \ --collectCoverageFrom='<zone-glob>' \ --coverageReporters=text-summary - From the
code-exploreranalysis, build the list of files to test. Skip type definitions, barrel re-exports, and thin wrappers with no branching. - For each remaining file, ask:
- Does it contain branching logic, state transitions, or side effects?
- Would a regression break user-facing behavior?
- Is it already covered indirectly by a parent test? If all answers are no, skip.
Step 2: Write Tests
Order: pure utils -> hooks -> viewModels -> components with side effects.
For each file:
- Search existing mocks/fixtures/factories before creating new ones (see testing skill).
- Write tests following all testing skill conventions.
- Run tests via
test-runner. Fix failures before moving to the next file.
Loop until coverage >= 90%.
Show full SKILL.md (175 more words)Show less
Step 3: Refactoring Loop
Three sequential passes. After each pass, run tests via test-runner -- they must still pass before the next pass.
Pass 1 -- Audit mocks
- For every mock (
jest.mock,jest.fn,mockReturnValue,jest.spyOn): is it asserted directly or does it enable a code path whose output is asserted? - Remove any mock that satisfies neither. Simplify over-specified mocks.
Pass 2 -- Deduplicate
- Scan all test files in the zone for repeated factories, inline fixtures, or mock setup blocks.
- Duplicated within one file -> extract a local helper.
- Duplicated across 2+ files -> move to nearest
__tests__/shared.ts. - Used in one file only -> keep local.
Pass 3 -- Prune redundant tests
- Two
itblocks testing the same branch with trivially different inputs -> merge or remove. - Tests that only assert a mock was called without verifying output or state -> strengthen or remove.
- Tests on logic-free getters (direct property access) -> remove.
Step 4: Summary Report
Output a report covering:
- Coverage: before/after percentages
- Tests written: for each file, what behaviors were tested and why they are relevant
- Remaining gaps: files still below 90% and why
© LedgerHQ, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/test-coverage of LedgerHQ/ledger-live.
Open the folder on GitHubat commit 30d7883
Compare with similar skills
Test Coverage next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Test Coverage this skillLedgerHQ/ledger-live | 622 | — | ~776 | Automated safety check: Pass | MIT | |
| Test Guidelinesgetsentry/sentry-react-native | 1.8k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Test Guidelinesgetsentry/sentry-dart | 873 | — | ~3.1k | Automated safety check: Pass | MIT | |
| Write Testsgrafana/synthetic-monitoring-app | 171 | — | ~1.2k | Automated safety check: Pass | AGPL-3.0 | |
| Write Testsopenplayerjs/openplayerjs | 649 | — | ~1.8k | Automated safety check: Pass | MIT | |
| Bun Testinvolvex/youtube-music-cli | 456 | — | ~2.3k | Automated safety check: Notes | MIT |
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Questions about Test Coverage
What does Test Coverage do?
Increase test coverage to 90% on a target zone with iterative writing and refactoring. Test Coverage is an agent skill from LedgerHQ/ledger-live.
When should I use Test Coverage?
Test Coverage fits situations like: tasks that involve Test coverage; tasks that involve Refactoring.
How do I install Test Coverage in Claude Code?
Run `npx skills add LedgerHQ/ledger-live --skill test-coverage -a claude-code`. Or copy the skill folder (.agents/skills/test-coverage in LedgerHQ/ledger-live) into .claude/skills/test-coverage in your project. Claude Code loads it when a task matches its description.
How do I install Test Coverage in Codex?
Run `npx skills add LedgerHQ/ledger-live --skill test-coverage -a codex`. Or copy the skill folder (.agents/skills/test-coverage in LedgerHQ/ledger-live) into .agents/skills/test-coverage in your project. Codex loads it when a task matches its description.
Can I use Test Coverage in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add LedgerHQ/ledger-live --skill test-coverage -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-coverage, .gemini/skills/test-coverage, .github/skills/test-coverage and .opencode/skills/test-coverage in your project.
What does Test Coverage need to run?
Going by SKILL.md and its folder, Test Coverage needs the command-line tools its instructions call (pnpm).
Does Test Coverage access the network?
SKILL.md names 1 domain. In commands or code: ledgerhq.atlassian.net; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Test Coverage safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Test Coverage use?
Test Coverage is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Test Coverage use?
About 776 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Test Coverage?
Skills that share tags, products or a category with Test Coverage: Test Guidelines (getsentry/sentry-react-native, 1.8k stars), Test Guidelines (getsentry/sentry-dart, 873 stars), Write Tests (grafana/synthetic-monitoring-app, 171 stars) and Write Tests (openplayerjs/openplayerjs, 649 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Test Coverage?
LedgerHQ (a GitHub organization) maintains it in LedgerHQ/ledger-live, which has 622 GitHub stars. The repository holds 50 skills in this directory. The repository was last updated on October 8, 2026.
Source: LedgerHQ/ledger-live on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.