test(xchain): cover the refusals of XLS-38 - #169
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TestIXChainNegative submits eight cross-chain transactions the SDK is willing to sign and asserts the result the ledger records: tecXCHAIN_WRONG_CHAIN, tecXCHAIN_SENDING_ACCOUNT_MISMATCH, tecXCHAIN_BAD_PUBLIC_KEY_ACCOUNT_PAIR, tecXCHAIN_CLAIM_NO_QUORUM, tecXCHAIN_BAD_CLAIM_ID, tecXCHAIN_REWARD_MISMATCH, tecDST_TAG_NEEDED and tecXCHAIN_INSUFF_CREATE_AMOUNT. These are the codes that report an attestation describing something other than what the ledger holds, so they are the ones that catch a signer regression the happy path cannot see. Two cases were written wrong first and the node corrected them, which is why the reasons are in comments: XChainClaim.Amount carries the issue of the chain the claim is paid on, and WasLockingChainSend also selects the issue preflight expects on the attested amount. tecXCHAIN_PROOF_UNKNOWN_KEY is left out on purpose - preclaim answers tecNO_PERMISSION before it, and the code belongs to the batch-of-attestations path a single transaction never takes. The bridge harness moves to TestIXChainBridgeBase, parameterised by quorum and witness count, so both XChain classes raise their stand the same way. Verified 8/8 on the standalone stand and 12/12 against devnet; the eight cells flipped on the coverage dashboard, XChainBridge 25/45 -> 33/45.
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📝 WalkthroughWalkthroughThe PR centralizes XChain bridge integration helpers and adds eight negative tests for XLS-38 refusal results. Devnet coverage runs the new fixture, and the changelog records the added coverage and setup corrections. ChangesXChain negative coverage
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The new refusal tests can become brittle if exception formatting changes. Assert the structured engine result to ensure the coverage continues to verify the intended ledger refusal codes. Sequence Diagram(s)sequenceDiagram
participant TestIXChainNegative
participant IXrplClient
participant XRPLLedger
TestIXChainNegative->>IXrplClient: autofill and submit invalid XChain transaction
IXrplClient->>XRPLLedger: apply transaction
XRPLLedger-->>IXrplClient: return refusal code
IXrplClient-->>TestIXChainNegative: return failed transaction result
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 56.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 3 files. (2 skipped: 2 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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In `@Tests/Xrpl.Tests/Integration/transactions/TestIXChainNegative.cs`:
- Line 65: Update the transaction failure assertion to compare
TransactionFailedException.EngineResult directly with expectedCode instead of
inspecting ex.Message, while preserving the existing refusal-code validation.
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.github/workflows/devnet-coverage.ymlCHANGES.mdTests/Xrpl.Tests/Integration/transactions/TestIXChainAttestation.csTests/Xrpl.Tests/Integration/transactions/TestIXChainBridgeBase.csTests/Xrpl.Tests/Integration/transactions/TestIXChainNegative.cs
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StringAssert.Contains on ex.Message matched presentation text, which can change while the node keeps reporting the same code. TransactionFailedException carries EngineResult for exactly this, so compare that. ReachedLedger goes with it: every code in this class is a tec, so the claim the helper's summary makes - that this is the result recorded in a ledger rather than an engine opinion on the open one - is now asserted instead of stated. Raised on the pull request by CodeRabbit. 8 of 8 on the standalone stand.
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Eight cross-chain transactions the SDK is perfectly willing to sign, each asserted against the result the ledger records. The point is not the codes themselves but what they are about: an attestation is bytes this library produces, and these are how rippled reports that the bytes describe something other than what the ledger holds. A regression in
XChainAttestationSignerthat still produced a well-formed signature would pass the happy-path class inTestIXChainAttestationand fail here.tecXCHAIN_WRONG_CHAINtecXCHAIN_SENDING_ACCOUNT_MISMATCHtecXCHAIN_BAD_PUBLIC_KEY_ACCOUNT_PAIRtecXCHAIN_CLAIM_NO_QUORUMtecXCHAIN_BAD_CLAIM_IDtecXCHAIN_REWARD_MISMATCHtecDST_TAG_NEEDEDtecXCHAIN_INSUFF_CREATE_AMOUNTTwo of these were written wrong first
Both are in comments where they bit, because both are easy to repeat.
XChainClaim.Amountcarries the issue of the chain the claim is paid on — the locking chain issuer, not the issuing chain door. Getting it wrong answerstecXCHAIN_BAD_TRANSFER_ISSUErather than the code under test, which is a confusing way to learn it.WasLockingChainSenddoes not only pick a direction.attestationPreflightderives the issue it expects on the attested amount from it (bridgeSpec.issue(srcChain(...))), so flipping the flag on its own makes the attestation a malformed proof, refused in preflight before it reaches the check the test was written for.What is deliberately absent
tecXCHAIN_PROOF_UNKNOWN_KEYreads like an obvious ninth case and is not reachable:checkAttestationPublicKeyanswerstecNO_PERMISSIONin preclaim first, and the code itself belongs to the branch that filters a batch of attestations, which a singleXChainAddClaimAttestationnever takes.path AMM:AMMwas the other candidate for this branch and is dropped.TestAMMDelete_EmptyPoolalready runs the lifecycle — one account creates the pool and withdraws all of it — and running it against devnet moved the hit counters without flipping the cell. Every greenpathon the dashboard belongs to an entry whose lifecycle ends in an explicit delete transaction (VaultDelete,CredentialDelete,DIDDelete,OracleDelete,MPTokenIssuanceDestroy); the AMM entry disappearing as a side effect ofAMMWithdrawdoes not count. ForAMMDeleteitself to apply, the pool has to be empty and still on the ledger, which needsdeleteAMMAccountto returntecINCOMPLETE, which needs more thankMaxDeletableAmmTrustLines(512,Protocol.h) trust lines on the AMM account. A non-zero balance does not do it — that path returnstecINTERNALand is marked unreachable. So the cell needs 512+ funded LP holders, and is out of reach here for the same structural reason as theLedgerStateFixcells.Refactor
The bridge harness moves from
TestIXChainAttestationintoTestIXChainBridgeBase, now taking a quorum and a witness count, so both XChain classes raise their stand the same way instead of two copies drifting apart.TestIXChainAttestationkeeps its private helpers as one-line delegations, so its test bodies are untouched.Verification
TestIXChainNegativeTestIXChainAttestation+TestIAMMDeleteAndVoteafter the refactorXChainBridgeon the coverage dashboardThe eight cells that flipped are exactly the eight above.
TestIXChainNegativejoins thedevnet-coveragedefault filter;TestIAMMDeleteAndVotedoes not, because it contributed no cells and that workflow exists for coverage.Summary by CodeRabbit
Bug Fixes
Tests