Parallel analysis lane

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# Parallel analysis lane | Field | Value | | --- | --- | | Session ID | `41e67712-f588-49bc-999d-e4c4ff089c9d` | | Lead session | `7afad2db-7619-414d-a931-4b24a86e022f` | | Record type | Parallel workstream export | :::note[Appendix record] Readable export of a supplementary review session. Tool outputs and system context are omitted; download the [JSONL archive](/audits/fable-chats-4626-2026-06.zip) for the complete log. ::: ## Engagement brief

Wednesday, Jun 10, 2026, 11:54 AM (UTC-7) You are fixing test suites broken by the Vitest 3 → 4 migration in the repo at /home/akitav2/projects/4626 (frontend package at /home/akitav2/projects/4626/frontend).

Context: The repo recently migrated to Vitest 4 (vitest 4.1.8). The production code is considered correct; these are TEST-ONLY breakages from Vitest 4 behavior changes. Known Vitest 4 changes that cause failures:

• vi.fn() mocks whose implementation is an arrow function can no longer be invoked with new ("The vi.fn() mock did not use 'function' or 'class' in its implementation"). Fix by giving the mock a function or class implementation.
• Module mock factory/hoisting semantics and spy behavior changed slightly.

Your assigned failing files (paths relative to /home/akitav2/projects/4626/frontend):

1. api/tests/arch-b/subAccountProvision.test.ts — 14 failures
2. api/tests/arch-b/status.test.ts — 1 failure
3. api/tests/arch-b/enroll.test.ts — 3 failures
4. server/zora/tests/commands.archB.sell.test.ts — 2 failures

Instructions:

• Work in /home/akitav2/projects/4626/frontend.
• For each file: run npx vitest run <file> to see failures, diagnose, fix the TEST file (preserve test intent and assertion strength — do not weaken, delete, or skip tests). Only modify production source if the failure is unambiguously test-infrastructure related and unfixable in the test, and explain why.
• Do NOT touch anything under server/_lib/arena/ (another session is actively editing it).
• Do NOT run the full test suite; only run your assigned files.
• Re-run each fixed file until green.

Final response: for each file, report root cause, what you changed, and final pass/fail status.

Analysis

I'll run the first test file to check what's failing.

Tools invoked: UpdateCurrentStep, Shell

Analysis

I see the issue—the mock PrivyClient is defined as an arrow function, which means it can't be instantiated with the new keyword. Let me check how the test file is setting up this mock.

Tools invoked: Grep

Analysis

I need to switch the mock implementation from an arrow function to a regular function so that the new operator works properly in Vitest 4, since arrow functions can't be constructed.I found that the mock is an arrow function, which Vitest 4 can't invoke with new, so I'm switching it to a regular function.

Tools invoked: StrReplace

Analysis

Tools invoked: Shell

Analysis

Tools invoked: Shell

Analysis

Tools invoked: Grep, Grep

Analysis

Same root cause in both. Fixing.

Both test files are using the same arrow-function mock implementation, and the status.test.ts failure shows delegated is null when it should be true — the issue stems from new PrivyClient throwing an error that the handler catches and returns as null. I need to fix the mock the same way in both places.

Tools invoked: StrReplace, StrReplace

Analysis

Tools invoked: Shell

Analysis

Tools invoked: Shell

Analysis

Tools invoked: Read

Analysis

I'm looking at two test failures. The first one is about an initial Zora quote call that's supposed to throw an error — I set up mockRejectedValueOnce to make the fetch fail, but the result came back with ok=true, which means the fetch actually succeeded instead. This suggests either the mock wasn't applied correctly or there's a default implementation in the beforeEach that's overriding it.

The second failure shows the "unable to fetch a quote" message, which is the initial quote failure path — so the first fetch call rejected when it shouldn't have. I'm wondering if there's a mock state leak between tests, or if the fetch call count is off because there's another fetch happening before the quote call that I'm not accounting for. These tests passed in Vitest 3, so something about how Vitest 4 handles mock state or the once implementations might have changed.I see the sell-test failures are due to fetch mock once-behaviors not being applied. Let me check how fetchMock is configured.

Tools invoked: Read

Analysis

I'm looking at two test failures related to mock behavior. The first test expects a typed refusal when the Zora quote call throws, but there's a conflict between the persistent mock setup in beforeEach and the once-implementation trying to override it. I'm checking whether Vitest 4 changed how it prioritizes once-implementations over default mocks compared to version 3.

The issue might be that the mockRejectedValueOnce is getting consumed by an earlier fetch call before it reaches the quote endpoint, or there's a change in how mockClear or clearAllMocks handles the once-queue versus the implementation itself in Vitest 4. So the once-queue isn't being cleared between tests in Vitest 4 — test 1's unconsumed mockRejectedValueOnce is bleeding into test 2, and leftover resolved values from earlier tests are shifting which mock gets consumed when. That's why test 1 sees ok=true (consuming a stale resolved value) and test 2 gets the initial quote failure (consuming test 1's rejection). Even though test 2 sets a new mockImplementation, the once-queue takes priority and gets consumed first.

The fix is to use mockReset() in beforeEach instead of clearAllMocks(), since mockReset actually clears the queued once-implementations along with everything else. The fix is to call mockReset() on fetchMock in beforeEach before setting up the fresh mock responses — this clears any leftover once-implementations from the previous test. I should scan the file for other places using mockResolvedValueOnce to make sure I'm not missing similar issues elsewhere.I found that the test failures are caused by leftover mockResolvedValueOnce entries leaking between tests—the preceding test queues two responses but only consumes one, and Vitest 4's vi.clearAllMocks() doesn't clear them. I'll check all once-usages in the file to determine the fix.

Tools invoked: Grep

Analysis

The issue is that fetchMock and checkRouterTargetMock are accumulating once-implementations, and Vitest 4 changed how vi.clearAllMocks() works—it no longer clears queued once-implementations. This means a leftover mockResolvedValueOnce from a previous test where the second fetch never executed (because signing failed) gets consumed in the next test, throwing off the mock queue. I need to explicitly reset these mocks in the test setup.Found the issue: a previous test queues two fetch responses but only consumes one, and Vitest 4's vi.clearAllMocks() doesn't discard the leftover, causing it to leak into the next test and shift the fetch queue. I'll fix it by explicitly calling mockReset() on those mocks in beforeEach.

Tools invoked: StrReplace

Analysis

Tools invoked: Shell

Analysis

All four files are passing now, so I'm running a quick lint check on the ones I edited.

Tools invoked: ReadLints

Analysis

Tools invoked: UpdateCurrentStep

Analysis

All four assigned files are now green. Test-only changes; no production source touched, no assertions weakened or skipped.

Per-file report

1. api/__tests__/arch-b/subAccountProvision.test.ts — PASS (36/36)

• Root cause: PrivyClientMock.mockImplementation(() => ({...})) used an arrow function. Vitest 4 mocks can no longer be invoked with new unless the implementation is a function/class, so new PrivyClient(...) in _subAccountProvisionCommit.ts threw "() => ... is not a constructor" (14 failures).
• Change: Switched the mock implementation to function () { return { getUserById: mocks.PrivyClientGetUserById } }.

2. api/__tests__/arch-b/status.test.ts — PASS (7/7)

• Root cause: Same arrow-function constructor issue. Here the handler swallows the new PrivyClient throw, so the symptom was delegated resolving to null instead of true (the stderr showed the Vitest "mock did not use 'function' or 'class'" warning).
• Change: Same function-implementation fix.

3. api/__tests__/arch-b/enroll.test.ts — PASS (9/9)

• Root cause: Same arrow-function constructor issue in _enroll.ts's new PrivyClient(...) (3 failures).
• Change: Same function-implementation fix.

4. server/zora/__tests__/commands.archB.sell.test.ts — PASS (26/26)

• Root cause: Cross-test leakage of queued once-implementations. In Vitest 4, vi.clearAllMocks() no longer drops queued mockResolvedValueOnce/mockRejectedValueOnce entries. The preceding Privy-signing-failure test queues two mockResolvedValueOnce fetch responses but only consumes one, so the leftover resolved value swallowed the mockRejectedValueOnce in the "initial Zora quote throws" test (sell succeeded, ok === true), and that unconsumed rejection then fired on the first fetch of the "re-quote throws after signing" test, producing the initial-quote error message instead of the re-quote one.
• Change: Added explicit fetchMock.mockReset() and checkRouterTargetMock.mockReset() at the top of beforeEach (the two mocks that accumulate *Once values), with a comment explaining the Vitest 4 behavior change. Defaults are re-applied immediately after, so test intent and assertion strength are unchanged.