Add test enqueueMany() wrapped message shape

[whangsg]

Summary

WorkersMessageQueue.enqueueMany() uses sendBatch() while enqueue()
uses send(), so nothing previously caught the two paths drifting apart
in how they wrap a message.

This adds three tests to packages/cfworkers/src/mod.test.ts:

1. enqueueMany() - wraps each message with body{} and contentType
   checks that each batch item is sent as { body, contentType }.

2. enqueue() and enqueueMany() - produce the same wrapped shape calls
   both methods with the same input and compares the wrapped message
   each one produces, to catch shape drift between the two paths.

3. enqueueMany() - omits ordering key when not provided confirms the
   ordering key is left undefined (not defaulted to some other value)
   when none is given.

Closes #878

Test plan

• mise exec -- npx vitest run -t "enqueueMany" while writing and
  checking each new test
• deno fmt --check packages/cfworkers
• mise exec -- npx vitest run inside packages/cfworkers — all 45
  tests pass (19 in src/mod.test.ts, up from 17)
• Confirmed the new tests fail when the behavior they pin is broken:
  renaming __fedify_ordering_key__ to __fedify_ordering_keyy__ in
  enqueueMany() failed 4 tests — mine, plus existing tests in
  test/mq.test.ts that check the same field — then reverted

AI disclosure

Claude Code (claude-sonnet-5) assisted with this change: it explained
the mocking pattern this package already uses (MockKvNamespace in the
same file), TypeScript concepts , and pointed out issues in code I had already written (naming conflicts,
a type error from a missing Queue property). Allowing AI_POLICY.md, I typed every line of
the test code myself, made every naming and structure decision, and ran
all verification myself.

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📝 Walkthrough

Walkthrough

Adds Cloudflare Workers Queue tests. The tests record send() and sendBatch() calls and verify payload wrapping, ordering keys, and matching shapes for enqueue() and enqueueMany().

Changes

Queue message shape validation

Layer / File(s)	Summary
Mock Queue and enqueue shape tests packages/cfworkers/src/mod.test.ts	Adds Queue test types and a MockQueue that records sends. Tests verify batch payload wrapping, ordering key preservation, omitted ordering keys, and parity between enqueue() and enqueueMany().

Priority: ⬇️ Low

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

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the added test and its focus on the wrapped message shape from enqueueMany().
Description check	✅ Passed	The description directly explains the three tests, their purpose, and the verification performed for enqueueMany().
Linked Issues check	✅ Passed	Issue #878 requires a focused test for WorkersMessageQueue.enqueueMany() in packages/cfworkers/src/mod.test.ts. The added tests verify { body, contentType: "json" } wrapping, compare the batch b…
Out of Scope Changes check	✅ Passed	The reviewed change adds only test support and tests in packages/cfworkers/src/mod.test.ts. The mock queue records send() and sendBatch() calls needed to test issue #878. No unrelated production…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

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Inline comments:
In `@packages/cfworkers/src/mod.test.ts`:
- Line 398: Update MockQueue to implement or derive its method signatures from
the imported Queue contract, including Promise<void> returns and matching
send/sendBatch parameter types. Remove the unknown-as-Queue double casts at all
three WorkersMessageQueue construction sites so TypeScript validates the mock
directly.

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• packages/cfworkers/src/mod.test.ts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.
see 1 file with indirect coverage changes

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[whangsg]

Thanks for the review and the correction on the response types.
Updated MockQueue to implement Queue from @cloudflare/workers-types (matching 4.20260511.1):
-send() → Promise
-sendBatch() → takes Iterable<MessageSendRequest>, returns Promise
-Added required metrics()
Removed all three as unknown as Queue casts. One empty-object cast remains for the listen()/ordering-lock tests, which don't call send/sendBatch/metrics.