Test Express response forwarding

[Lumia1108]

This adds regression coverage confirming that @fedify/express forwards a Fedify response's status, headers, and every streamed body chunk to the Express response. The response mock now records headers so that the test can verify header forwarding case-insensitively.

Closes #856

Testing

All checks passed locally:

• mise run test:deno packages/express/src/index.test.ts
• mise run check-each express
• mise run test-each express

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ℹ️ Recent review info

⚙️ Run configuration

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Reviewing files that changed from the base of the PR and between 49d937e and 1af83de.

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• packages/express/src/index.test.ts

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📝 Walkthrough

Walkthrough

The Express test mock now records response headers. A new test checks that integrateFederation() forwards a Fedify response's status, header, and streamed body.

Changes

Response forwarding test

Layer / File(s)	Summary
Response mock and forwarding test packages/express/src/index.test.ts	The response mock stores headers by lowercase name and provides getHeader. The new test checks forwarding of status 201, a header, and a streamed body.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 1af83

The new test covers response status, headers, and streamed body forwarding. No merge-blocking issue is identified.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the regression test for Express response forwarding.
Description check	✅ Passed	The description explains the test coverage, response mock changes, linked issue, and reported checks. It is directly related to the changeset.
Linked Issues check	✅ Passed	Issue #856 asks for a test in packages/express/src/index.test.ts that verifies integrateFederation() forwards response status, headers, and body. The PR summary confirms a new test covers status, …
Out of Scope Changes check	✅ Passed	The changes are limited to the Express integration test. The response mock changes and import reordering support the regression test for issue #856. No unrelated changes are reported.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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