test: integration tests for sourcedFrom and allowStaleWhileRevalidate

[kriszyp]

Closes #1189

Summary

After review feedback from Nathan Heskew: the four tests originally in this PR (cache miss/hit, 404 passthrough, DELETE invalidation, SWR) duplicate coverage already comprehensively provided by unitTests/resources/caching.test.js. This PR has been scoped down accordingly.

The file integrationTests/server/caching.test.ts now contains only an explanatory comment block that:

• Explicitly redirects readers to the unit suite for miss/hit, invalidation, SWR, and stampede scenarios.
• Documents the one genuinely untested scenario — replicationSource: true — with a TODO pointing to Add integration tests for sourcedFrom, stale-while-revalidate, and replicationSource cache patterns #1189. That scenario requires a 2-node cluster harness not yet available in integrationTests/.

What changed

• Removed ~350 lines of test code that duplicated unit coverage.
• Added a 14-line comment/TODO block explaining the scope and the gap.

What's not here (and why)

replicationSource: true causes sourcedFrom to fetch on a replica node rather than the origin. Testing it end-to-end requires a live 2-node cluster setup. The tracking issue is #1189; a follow-up PR against integrationTests/ can add that once a cluster harness exists.

Generated by Claude Sonnet 4.6 (claude-sonnet-4-6[1m]).

[gemini-code-assist]

Code Review

This pull request introduces a new integration test suite (caching.test.ts) to verify caching behaviors such as sourcedFrom() and allowStaleWhileRevalidate() end-to-end using a mock HTTP origin server. The feedback focuses on robust resource management within the tests: specifically, calling server.closeAllConnections() during teardown to prevent hanging connections, and ensuring all fetch response bodies are consumed to avoid potential socket leaks in Node.js.

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[gemini-code-assist]

To prevent hanging connections from keeping the test runner alive or causing timeouts during teardown, call server.closeAllConnections() immediately after calling server.close(). This ensures all active keep-alive connections (such as those from Harper's internal fetch client) are forcefully closed.

Suggested change

	close: () => new Promise<void>((resolve, reject) => server.close((err) => (err ? reject(err) : resolve()))),
	close: () =>
	new Promise<void>((resolve, reject) => {
	server.close((err) => (err ? reject(err) : resolve()));
	server.closeAllConnections();
	}),

[gemini-code-assist]

The response body of the fetch call is not consumed. In Node.js (via undici), leaving response bodies unconsumed can lead to socket leaks and hanging connections. It is recommended to consume the body (e.g., by calling await r.arrayBuffer() or await r.text()) even for error responses like 404.

		const r = await fetch(`${baseUrl}/CachedProduct/${id}`, { headers: { Authorization: authHeader } });
		strictEqual(r.status, 404, 'Should return 404 when origin returns 404');
		await r.arrayBuffer();
		strictEqual(origin.fetchCount(id), 1, 'Origin should have been called once');

[gemini-code-assist]

The response body of r1 is not consumed. To prevent socket leaks and ensure the connection is released back to the pool, consume the response body.

Suggested change

	const r1 = await fetch(`${baseUrl}/CachedProduct/${id}`, { headers: { Authorization: authHeader } });
	strictEqual(r1.status, 200);
	strictEqual(origin.fetchCount(id), 1, 'Should fetch from origin on first GET');
	const r1 = await fetch(`${baseUrl}/CachedProduct/${id}`, { headers: { Authorization: authHeader } });
	strictEqual(r1.status, 200);
	await r1.arrayBuffer();
	strictEqual(origin.fetchCount(id), 1, 'Should fetch from origin on first GET');

[gemini-code-assist]

The response body of the DELETE request is not consumed. Consume the response body to prevent potential socket leaks.

Suggested change

	const rDel = await fetch(`${baseUrl}/CachedProduct/${id}`, {
	method: 'DELETE',
	headers: { Authorization: authHeader },
	});
	ok(rDel.status === 200 || rDel.status === 204, `DELETE should succeed, got ${rDel.status}`);
	const rDel = await fetch(`${baseUrl}/CachedProduct/${id}`, {
	method: 'DELETE',
	headers: { Authorization: authHeader },
	});
	ok(rDel.status === 200 || rDel.status === 204, `DELETE should succeed, got ${rDel.status}`);
	await rDel.arrayBuffer();

[claude]

Reviewed; no blockers found.