test(review): cover deploymentStatusToPreview's branch logic directly

[bitfathers94]

test(review): use falsy pr number for object-payload null case

Satisfy exactOptionalPropertyTypes by asserting a present-but-falsy pr
(0) rather than an explicit undefined property, which tsc rejects.

Closes #9292

Validation

Verified locally on this branch before opening:

• npm run typecheck
• npx turbo run build:tsc build:verify
• npm run test:coverage — patch coverage 100.0% of changed lines

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

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✅ LoopOver review result - approve/merge recommended

_{Review updated: 2026-07-27 14:19:25 UTC}

1 file · 1 AI reviewer · no blockers · readiness 95/100 · CI green · clean

✅ Suggested Action - Approve/Merge

• safe to merge

Review summary
This is a pure test-only PR that adds a dedicated `describe("deploymentStatusToPreview branch logic (#9292)")` block directly unit-testing all branches of that function (success/failure/error/in-flight states, string vs. object payload parsing, malformed JSON, missing PR number, missing deployment_status/deployment) rather than relying solely on integration fixtures elsewhere. The description explains a specific TS fix: using a present-but-falsy `pr: 0` instead of an explicit `undefined` property to satisfy `exactOptionalPropertyTypes`, which is reflected correctly in the 'neither payload carries a PR number' test. All CI checks (typecheck, build:verify, test:coverage) passed on this exact commit, and the diff closes the linked issue #9292 as required.

Nits — 4 non-blocking

• The `successStatus` shared fixture reuses `https:​//pr-42.app.workers.dev` even in the object-payload test (`preview-url.test.ts` new block, 'resolves the PR number from an already-decoded object payload'), which is slightly confusing since the PR number in that case is 99 but the URL still says pr-42 — consider a distinct URL or a comment noting the URL is unrelated to the PR number field.
• Minor duplication across the three 'returns null' sub-assertions in the last-but-one test case; could be tightened with `it.each`, though current style matches the rest of the file.
• Consider adding a one-line comment on the `pr: 0` case explicitly stating it exercises the falsy-but-present PR number path called out in the PR description, since that's the specific defect (`exactOptionalPropertyTypes`) this PR was written to work around.
• If `deploymentStatusToPreview` is reused elsewhere with a `ref`-only (no `sha`) deployment, consider adding one more case mirroring `headRef`-only resolution for symmetry with the existing `headSha`+`headRef` success case.

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	#9292
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: 65 registered-repo PR(s), 45 merged, 0 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	bitfathers94; Gittensor profile; 65 PR(s), 0 issue(s).
Improvement	ℹ️ Insufficient signal	risk: clean · value: insufficient-signal · LLM: minor

Linked issue satisfaction

Addressed
The PR adds a dedicated describe block directly importing deploymentStatusToPreview and exercises every enumerated branch: success with URL, failure, error, in-flight states (queued/in_progress/pending), object vs string payload, malformed JSON, and missing PR number cases, each with its own minimal fixture rather than reusing the integration test's fixture.

Review context

• Author: bitfathers94
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: TypeScript
• Official Gittensor activity: 65 PR(s), 0 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Start here: Triage stale or unlinked PRs.

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.