From bd650308a99aa4233074a11a541248134bc23568 Mon Sep 17 00:00:00 2001
From: SkyZeroZx <73321943+SkyZeroZx@users.noreply.github.com>
Date: Tue, 11 Aug 2026 10:20:18 -0500
Subject: [PATCH] test(platform-server): clean up viewport hydration observer

Trigger routed viewport hydration so its cached observer is removed before later randomized specs run.
---
 packages/platform-server/test/incremental_hydration_spec.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/platform-server/test/incremental_hydration_spec.ts b/packages/platform-server/test/incremental_hydration_spec.ts
index 09c709d41a3..74a81426c7d 100644
--- a/packages/platform-server/test/incremental_hydration_spec.ts
+++ b/packages/platform-server/test/incremental_hydration_spec.ts
@@ -1376,6 +1376,12 @@ describe('platform-server partial hydration integration', () => {
 
           expect(activeObservers.length).toBe(1);
           expect(activeObservers[0].options).toEqual({rootMargin: '123px', threshold: 0.5});
+
+          const article = doc.getElementsByTagName('article')[0];
+          MockIntersectionObserver.invokeCallbacksForElement(article, true);
+          await appRef.whenStable();
+
+          expect(activeObservers[0].observedElements.size).toBe(0);
         });
       });