From 3ba25cd4cbc1fe2e2b390ad34b6ababe0a659f37 Mon Sep 17 00:00:00 2001
From: Tianyi Cui <53024+tianyicui@users.noreply.github.com>
Date: Mon, 14 Sep 2026 16:09:15 +0800
Subject: [PATCH] test(session): exclude interval fallback from mandatory
 checkpoint

---
 packages/session/session-projection-cache/tests/cache.spec.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/session/session-projection-cache/tests/cache.spec.ts b/packages/session/session-projection-cache/tests/cache.spec.ts
index a72466fbfe..f2aed29df1 100644
--- a/packages/session/session-projection-cache/tests/cache.spec.ts
+++ b/packages/session/session-projection-cache/tests/cache.spec.ts
@@ -201,6 +201,8 @@ afterEach(async () => {
 describe('SessionProjectionCache write policy', () => {
   it('writes a durable checkpoint at turn/end (mandatory point)', async () => {
     const { ctx, root } = await harness()
+    // The interval cannot substitute for the mandatory turn/end trigger.
+    vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
     const id = SessionId('turn-end')
     const created = whenWritten(ctx, id)
     const session = ctx.sessions.create(id)