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test: fix variants-retry-after HTTP-date flake (TODOS P2)

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toUTCString() truncates to whole seconds, so a +3000ms Retry-After date
could mean an effective wait of ~2001ms — flaking against the 2500ms
assertion floor ~1-2 in 9 runs under suite load. +4000ms puts the
truncation floor at 3001ms with the assertion floor safely below it.
Pulled forward from U4 because the free-tests lane is now a required
check and this flake would randomly block PRs.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Garry Tan
2026-08-15 08:44:43 -07:00
co-authored by Claude Fable 5
parent d5fed59adf
commit 97cb10714e
1 changed files with 8 additions and 3 deletions
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design/test/variants-retry-after.test.ts
+8 -3
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@@ -78,7 +78,12 @@ describe("generateVariant Retry-After handling", () => {
test("HTTP-date: honors a future date with no extra leading exponential", async () => {
const calls: CallRecord[] = [];
const future = new Date(Date.now() + 3000).toUTCString();
// toUTCString() truncates to whole seconds: a +3000ms date could mean an
// effective wait as low as ~2001ms, which flaked against a 2500ms floor
// under suite load (~1-2 in 9 runs — the TODOS P2 flake). +4000ms makes
// the truncation floor 3001ms; the assertion floor sits safely below it
// and the ceiling stays wide enough for a loaded scheduler.
const future = new Date(Date.now() + 4000).toUTCString();
const fetchFn = makeStubFetch([rateLimited(future), successResponse()], calls);
const result = await generateVariant(
@@ -88,8 +93,8 @@ describe("generateVariant Retry-After handling", () => {
expect(result.success).toBe(true);
expect(calls.length).toBe(2);
const gap = calls[1].ts - calls[0].ts;
expect(gap).toBeGreaterThanOrEqual(2500);
expect(gap).toBeLessThan(4500);
expect(gap).toBeGreaterThanOrEqual(2900);
expect(gap).toBeLessThan(5500);
});
test("invalid Retry-After (alphanumeric): falls through to exponential", async () => {