test(miner-extension): cover options.js pure helpers without a jsdom harness

[luciferlive112116]

Closes #7008

Summary

• apps/loopover-miner-extension/options.js's pure, DOM-independent helpers had no test file, while its sibling content.js already proved out a lightweight, jsdom-free testing technique (test/content.test.ts, fix(extension): content.js's loadOpportunityBadge has no failure handling around chrome.runtime.sendMessage, unlike every other message call site #6189).
• Adds test/options.test.ts using the same __LOOPOVER_MINER_EXTENSION_TEST__ import hook: importing options.js on a non-mounted path (a null-returning document) makes it take its "options.html is not mounted" branch, exposing the internals with no DOM side effects and no jsdom mount harness.
• Covers parseWatchedRepos, parseRankedCandidatesJson (empty short-circuit, array parse, non-array rejection, and the UTF-8 byte-size quota that guards chrome.storage.local against the silent over-quota failure of Add storage-size validation for pasted JSON #4863), normalizeMinerUiUrl (trim + default fallback), and the legacy discoveryIndexUrl purge (fix(miner-extension): remove dead discoveryIndexUrl config field #5343).
• Updates the README's now-stale deferred-coverage note: content.js and options.js pure logic are now tested this way; only the mounted options-page/content-script UI event handlers still genuinely need a real DOM harness.

Scope

• The PR title follows type(scope): short summary Conventional Commit format.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes — it is a test-only + README-note change scoped to apps/loopover-miner-extension/.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves — Closes #7008.

Validation

• git diff --check — clean.
• npm run typecheck — 0 errors (the root tsc config type-checks the new test/options.test.ts).
• Extension suite: npm --workspace @loopover/miner-extension test — 31 tests pass (24 prior + 7 new) with vitest.config.ts coverage thresholds still met (options.js is not in coverage.include, so the new test adds behavior coverage without moving the gated numbers, mirroring content.js).
• npm run miner-extension:lint (node --check on all scripts) and npm run miner-extension:typecheck pass; ESLint on the new test file is clean.

If any required check was skipped, explain why:

• test:coverage, test:workers, build:mcp/test:mcp-pack, ui:openapi:check, ui:lint/ui:typecheck/ui:build, and npm audit are not applicable: this PR touches only apps/loopover-miner-extension/** (a test file plus a README note) — no src/**, no MCP/API/OpenAPI surface, no @loopover/ui files, and no dependency changes. apps/** is outside the Codecov codecov/patch scope, so there is no changed backend line/branch to cover; the extension's own vitest thresholds (verified above) are the relevant coverage signal.

Safety

• No secrets, wallet details, hotkeys, coldkeys, PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests — N/A (none in this PR).
• API/OpenAPI/MCP behavior is updated and tested where needed — N/A (none in this PR).
• UI changes use live API data or real empty/error/loading states — N/A (no UI behavior change).
• Visible UI changes include a UI Evidence section — N/A: this is a test-only + README-note change; options.js's runtime behavior and the extension UI are unchanged, so there is nothing visual to screenshot.
• Public docs are updated where needed (the README deferred-coverage note); no changelog edited.

UI Evidence

Not applicable — no visible UI, frontend, or behavioral change. This PR adds a unit-test file and updates a README note only; options.js itself is unchanged, so there is no rendered state to capture.

Notes

• The extension's vitest suite is not currently a CI-gated step (CI runs miner-extension:lint/:typecheck/:build); the new test file is nonetheless type-checked by the root typecheck job and passes locally with thresholds met, matching how content.test.ts already lives in this package.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[loopover-orb]

Tip

✅ LoopOver review result - approve/merge recommended

_{Review updated: 2026-07-17 22:12:57 UTC}

2 files · 1 AI reviewer · no blockers · readiness 98/100 · CI green · clean

✅ Suggested Action - Approve/Merge

• safe to merge

Review summary
Test-only PR adding test/options.test.ts covering options.js's pure helpers (parseWatchedRepos, parseRankedCandidatesJson, normalizeMinerUiUrl, removeLegacyDiscoveryIndexUrl) via the same non-mounted-import trick already established for content.js in #6189, plus a README update reflecting the now-narrower deferred-coverage scope. The technique is sound: stubbing document.querySelector to return null and stubbing chrome/__LOOPOVER_MINER_EXTENSION_TEST__ globals lets the module take its unmounted branch and expose internals with no jsdom needed. Tests are well-targeted, hit both branches of nullish coalescing and quota boundary checks, and CI passed. This closes #7008 as claimed and is narrowly scoped to the extension's test suite and README.

Nits — 3 non-blocking

• The oversized-payload test in options.test.ts uses "a".repeat(MAX_RANKED_CANDIDATES_JSON_BYTES + 1), which only exercises single-byte UTF-8 chars — consider adding a case with multi-byte characters to actually prove the TextEncoder byte-length (not char-length) claim in the comment.
• README.md's new paragraph is dense; consider breaking the content.js vs options.js distinction into two sentences for readability.
• Add a multi-byte-character test case to more directly validate the UTF-8 byte-size quota claim called out in both the PR description and the test comment.

Decision drivers

• ✅ Code review — No blockers (1 reviewer)
• ✅ Gate result — Passing (No configured blocker found.)

Context & advisory signals — never blocks the verdict

Signal	Result	Evidence
Linked issue	✅ Linked	#7008
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 179 registered-repo PR(s), 110 merged, 27 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	luciferlive112116; Gittensor profile; 179 PR(s), 27 issue(s).
Improvement	ℹ️ Insufficient signal	risk: clean · value: insufficient-signal · LLM: minor

Review context

• Author: luciferlive112116
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: not available
• Official Gittensor activity: 179 PR(s), 27 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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LoopOver approves — the gate is satisfied and CI is green.