test: cover the CantDo(DisputeCreationError) arm

[21Mill]

Closes #907.

#848 changed dispute_action so a setup_dispute failure reaches the client
instead of being swallowed, but nothing pinned that behaviour —
DisputeCreationError appeared nowhere under src/.

The state the test builds

The arm is unreachable through the ordinary flow: a second dispute on the same
order trips the DisputeAlreadyExists guard long before setup_dispute runs
twice. It needs an inconsistent database — an order with buyer_dispute set
and no matching row in disputes — so the test writes that flag directly with
sqlx::query and inserts no dispute row, then sends the dispute as the buyer.

What it asserts

• dispute_action returns CantDo(DisputeCreationError).
• No dispute row is created — the behaviour that actually changed in refactor: removed dead code identified in issue  #848,
  since the old code created it anyway. As @ToRyVand noted on the issue,
  find_dispute_by_order_id uses fetch_one, so a missing row is Err rather
  than Ok(None), which makes is_err() the right assertion here.
• Nothing was persisted before the early return: status still active,
  seller_dispute still unset.

Verified it fails against the pre-#848 behaviour: restoring the old
if order.setup_dispute(..).is_ok() { .. } makes it fail on the
DisputeCreationError assertion.

Also

One comment at the call site recording the invariant from the issue:
setup_dispute sets order.status before its error return, so the local order
is left dirty on Err — harmless only because the early return happens before
any persist.

Verification

test result: ok. 1234 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out

cargo clippy --all-targets --all-features -- -D warnings is clean and
cargo fmt has been applied.

Summary by CodeRabbit

• Bug Fixes
  • Prevented failed dispute setup attempts from persisting unintended order changes.
  • Added validation for orders with an existing dispute flag but no corresponding dispute record.
  • Confirmed that failed dispute creation returns the appropriate error without creating a dispute record.

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Review details

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Configuration used: Organization UI

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Run ID: d7018d0e-bf3e-4d2c-9f36-9f0e5e5175a1

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Reviewing files that changed from the base of the PR and between c621783 and 601ef60.

📒 Files selected for processing (1)

• src/app/dispute.rs

Walkthrough

The dispute flow now documents that failed setup returns before persistence. A regression test covers an existing dispute flag without a dispute row and verifies the returned error and unchanged database state.

Changes

Dispute error handling

Layer / File(s)	Summary
Dispute setup failure regression src/app/dispute.rs	The code documents that failed dispute setup returns before persisting the mutated order. The regression test verifies DisputeCreationError, no dispute row, and unchanged order status and flags.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: 🔵 Low · up to c6217

The PR adds focused coverage for the DisputeCreationError path, but the test does not verify that the existing buyer-dispute flag remains set, so a persistence regression could pass unnoticed. This is a bounded, non-blocking follow-up for explicit owner awareness.

Suggested reviewers: arkanoider, grunch, arowolokehinde

Poem

I’m a rabbit guarding the dispute row,
No faulty flag shall make it grow.
The error hops back, the order stays clean,
No hidden record slips between.
Test it twice, then let it go!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the added test coverage for the DisputeCreationError path.
Linked Issues check	✅ Passed	The changes satisfy issue #907 by testing the error response, preventing dispute-row creation, checking order persistence, and documenting the local mutation.
Out of Scope Changes check	✅ Passed	The changes are limited to the requested regression test and documentation for the DisputeCreationError path.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 1 files.

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[21Mill]

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Actionable comments posted: 1

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Inline comments:
In `@src/app/dispute.rs`:
- Around line 483-487: Extend the persisted-order assertions in the
dispute_action test to verify that buyer_dispute remains set after the early
return, alongside the existing status and seller_dispute checks. Use the stored
Order loaded by Order::by_id and assert the expected true/1 value for
buyer_dispute.

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Configuration used: Organization UI

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Run ID: 4fd8fda6-9af3-441c-a126-91fb0c898be4

📥 Commits

Reviewing files that changed from the base of the PR and between 848ee3b and c621783.

📒 Files selected for processing (1)

• src/app/dispute.rs

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[ToRyVand]

Verified locally on 601ef60: 1234 passed, clippy and fmt clean. Both claims in the description hold — setup_dispute returns DisputeCreationError when neither flag flips, and it does set self.status before that return, so the comment at the call site is accurate.

One correction, and it makes this test worth more rather than less. The arm is not only reachable through a hand-written inconsistent DB — dispute_action produces that state itself:

order.clone().update(pool).await...?;          // buyer_dispute = 1 persisted
let dispute = dispute.create(pool).await...?;  // the row

Two statements, no transaction. If create fails, the order keeps a persisted dispute flag with no disputes row — exactly what the test builds with sqlx::query. The buyer is then locked out of disputing that order permanently (every retry lands on this arm), the seller still succeeds, and with no row solvers never see it.

job_escrow_deadline in src/scheduler.rs orders the same two writes the other way and says why: "Row first, then the status flip ... a dispute order with no row would be invisible." It also guards with if disputed.buyer_dispute before calling setup_dispute — that path already treats this arm as live.

So this pins the residue of a real failure mode, not a defensive impossibility. Worth a line in the description. Happy to open a separate issue for the write ordering in dispute_action; it is outside this PR.