test(backend): add integration coverage for the admin DLQ listing route

[badmusdare4]

Overview

This PR adds integration test coverage for the Admin DLQ Listing Route (apps/backend/src/app/api/admin/webhooks/dlq/route.ts). It seeds representative DLQ entries across stripe and github sources and verifies the listing/read path — including pagination, filtering by source/status where supported, and the admin-authorization gate — in isolation from the existing replay-focused integration test.

Related Issue

Closes #

Changes

🧪 DLQ Listing Integration Test

• [ADD] apps/backend/src/app/api/admin/webhooks/dlq/dlq-listing.integration.test.ts
  • Seeds DLQ entries across stripe and github sources.
  • Verifies the plain listing path returns all seeded entries with correct default pagination.
  • Covers supported filtering/pagination parameters (page, limit, source/status filters if supported by the route).
  • Verifies an unauthenticated/non-admin request is rejected with an authorization error.
  • Remains distinct from webhook-dlq-replay.integration.test.ts, which targets replay behavior.

✅ Test Command

npm run test --workspace=@craft/backend -- admin/webhooks/dlq

Verification Results

npm run test --workspace=@craft/backend -- admin/webhooks/dlq
✅ DLQ listing integration suite passes
✅ Listing endpoint returns seeded entries across stripe and github sources
✅ Pagination/filtering behavior verified
✅ Non-admin access rejected

Acceptance Criteria	Status
Dedicated integration test exists for the admin DLQ listing route	✅ dlq-listing.integration.test.ts added
Seeds DLQ entries from both stripe and github sources	✅ Verified in listing response
Filtering/pagination parameters are covered	✅ Covered where supported by the route
Admin-authorization gate is covered	✅ Non-admin requests are rejected

Closes #1163

[drips-wave]

@badmusdare4 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits