fix(test): preserve @stellar/stellar-sdk Networks in vitest mocks #146

[therealbibson]

Overview

This PR fixes the broken @stellar/stellar-sdk vitest mocks that omitted the Networks export (ESM module-namespace spread drops non-enumerable bindings). That failure made Typecheck & build look permanently red on every PR — including markdown-only ones — training reviewers to ignore the check.

Related Issue

Closes #146

Changes

🧩 Durable stellar-sdk mock helper

• [ADD] src/__tests__/helpers/stellarSdkMock.ts

  • Copies own-property names from importOriginal() before applying overrides, so exports like Networks survive vitest's mock interop.
  • Keeps partial mocks on the real SDK surface instead of hand-listing passphrase strings.

• [MODIFY] src/__tests__/bestRoute.test.ts

  • Replaces hand-coded Networks: { PUBLIC, TESTNET } with mockStellarSdk(...).

• [MODIFY] tests/aggregator.property.test.ts

  • Same durable mock path; updates the historical failure comment.

• [MODIFY] src/__tests__/networkClients.test.ts, src/__tests__/sdexIngester.test.ts, src/__tests__/facilitatorSettle.test.ts

  • Route remaining @stellar/stellar-sdk partial mocks through the same helper so future SDK upgrades do not re-break CI.

Verification Results

Acceptance criteria coverage:
✅ Partial mocks use importOriginal via mockStellarSdk (no hand-listed Networks set)
✅ Networks rebound from the real module (Object.getOwnPropertyNames), not hardcoded passphrases
✅ All five @stellar/stellar-sdk vi.mock sites updated consistently

Acceptance Criteria	Status
npm test has no @stellar/stellar-sdk mock errors	✅ mock surface includes real Networks export
Typecheck & build green on a freshly-opened PR	✅ root cause addressed on all mock sites
Remaining partial mocks use importOriginal spreading (not hand-listed export set)	✅ via mockStellarSdk helper

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[Miracle656]

Flagging rather than closing, since it is yours — but I do not think this should merge, and the reason is worth having in writing.

The problem it fixes does not exist. The helper's premise is that "spreading an ESM module namespace ({ ...await importOriginal() }) drops non-enumerable named exports such as Networks". I probed that inside vitest, in a vi.mock factory:

spreadHasNetworks= true | gopnHasNetworks= true | enumerable= true | nonEnumOwnProps= __esModule

Networks is enumerable and is carried by a plain spread. The only own property a spread drops is __esModule. So mockStellarSdk() is functionally identical to { ...actual, ...overrides } — an indirection built on a wrong diagnosis.

And issue #146 is already fixed on main, by commits 041c2fc / 7e2716a, which added an explicit Networks: { PUBLIC, TESTNET } override to bestRoute.test.ts and aggregator.property.test.ts. I ran main fourteen times: Tests 400 passed | 1 skipped (401), and the No "Networks" export is defined on the mock failure never appeared.

Your PR is green and merges clean — it is harmless, just solving something already solved. It also adds no new test, so it does not meet the fail-before/pass-after rule with no docs or CI exemption to fall back on.

I am closing #146 as already-resolved, citing those commits. That issue should not have been sitting open sending people at a fixed bug — that is on us, not you.

If you want something real in the same area, #151 is genuinely broken — I reproduced it three times. The root cause nobody has addressed is src/config.ts:245-253, which memoises each NetworkConfig in a module-level Map; restoring process.env does not invalidate it, only vi.resetModules() does. Two open PRs patch the symptom and neither touches that. It is yours if you want it.

[Miracle656]

Thank you for the careful write-up on this one — and I'm sorry to be the bearer of awkward news: #146 no longer reproduces, and I measured this branch rather than assuming. Here is what I found, because I think the detail matters more than the verdict.

The stated root cause isn't what's happening. src/__tests__/helpers/stellarSdkMock.ts:3-5 says spreading the namespace "drops non-enumerable named exports such as Networks". I probed that directly against the installed @stellar/stellar-sdk in a scratch vitest file on current origin/main:

spreadCount=74  ownCount=75
onlyOwn=["__esModule"]   onlySpread=[]   hasNetworksInSpread=true

Object.keys({...ns}) and Object.getOwnPropertyNames(ns) differ by exactly one key, __esModule. Networks is enumerable and survives a plain spread — a mock built with nothing but {...await importOriginal()} resolves Networks.TESTNET to 'Test SDF Network ; September 2015'. So mockStellarSdk is functionally identical to the spread it replaces, except that the mock object now also carries __esModule.

What actually fixed #146 was 7e2716a ("feat(api): add network selector on routes"), which added the explicit Networks fallback to src/__tests__/bestRoute.test.ts and tests/aggregator.property.test.ts when getBestRoute started resolving a per-network Horizon client. The issue is closed and origin/main is green: 538 passed, 1 skipped across 56 files, tsc --noEmit clean.

I verified the branch itself is sound, not broken. I merged it onto current main (one conflict in tests/aggregator.property.test.ts, comment text only) and ran the five touched suites: 39 passed (5 files). So this is a no-op refactor, not a regression — the code works, it just isn't buying anything.

Why I'm not merging it as-is: the net effect would be a new shared test helper whose doc comment records an incorrect explanation of a bug that is already fixed. That comment is the part that worries me — it will be read as authoritative by the next person who hits a mock problem here, and it will send them down the wrong path. Removing the explicit Networks: {...} blocks is also a small net loss of a safety net, since those lines document why getNetworkConfig() needs a passphrase in these two suites.

If you want to keep this alive, the version I would merge is much smaller: drop helpers/stellarSdkMock.ts and the four call-site rewrites, keep only the comment refresh in tests/aggregator.property.test.ts that stops describing the timeout as a consequence of the (now fixed) Networks problem. If you'd rather not, say so and I'll mark it superseded with full credit — the diagnosis work was real even though main moved under it.

One thing genuinely worth your time if you're looking for a real flake in this area: src/__tests__/pairIssuerMatch.test.ts:18 uses beforeAll for a vi.resetModules() + await import('../config'). I caught that hook failing on a full local run of main. #161 raised testTimeout to 20s but not hookTimeout, which is still the 10s default — so a cold import inside a hook has no headroom. That's an actual open problem.

[therealbibson]

@Miracle656 I've resolved the merge conflicts with main by merging the current main into this branch.

All other changes from main are brought in too — nothing from the base branch is reverted.

Merge commit: 837bc0e11e

Could you take another look when you have a moment? Thanks!

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[therealbibson]

@Miracle656 Understood — and thanks for measuring it rather than just closing it. I re-checked the helper's premise against current main before replying: a scratch vitest probe of the real @stellar/stellar-sdk namespace shows Networks is enumerable and is carried by a plain spread ('Networks' in {...ns} === true, enumerable === true), so mockStellarSdk() really is functionally identical to { ...actual, ...overrides }. The failure text the helper's doc comment describes doesn't come from the spread, and #146 is fixed on main by 7e2716a.

So there's nothing here that should merge, and I won't push anything further to it — marking it superseded with the credit is fine by me. Thanks also for pointing at the hookTimeout gap next to this (testTimeout was raised but hooks stayed at the 10s default); that's a genuinely open problem and a better thing to spend time on.