From c615ff17bf19bf935a0e69f22adb6ff14bb705bc Mon Sep 17 00:00:00 2001
From: James <james@eli.cx>
Date: Sat, 22 Aug 2026 02:16:23 +0100
Subject: [PATCH] test(cloudflare): prove browser reuse of warmed RSC variants

---
 .../cloudflare-workers/rsc-prewarm.spec.ts    | 27 ++++++++++++++++---
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts b/tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts
index c9a52ccde..ce8eb4f49 100644
--- a/tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts
+++ b/tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts
@@ -269,6 +269,17 @@ test("deploy-prewarmed full and loading RSC variants are reused by browser navig
     });
   }
 
+  await runFresh(async (page) => {
+    await gotoCurrentBuild(page, "/prewarm/router");
+    const shell = await observeRsc(page, () => page.getByTestId("router-prefetch").click());
+    expectLoadingShell(shell);
+
+    const full = await observeRsc(page, () => page.getByTestId("router-navigate").click());
+    expectFull(full);
+    await expect(page).toHaveURL(new RegExp(`${TARGET_PATH}$`));
+    await expect(page.getByRole("heading", { name: "Prewarm target" })).toBeVisible();
+  });
+
   await runFresh(async (page) => {
     let targetRscRequests = 0;
     page.on("request", (request) => {
@@ -295,8 +306,16 @@ test("deploy-prewarmed full and loading RSC variants are reused by browser navig
     await expect(page).toHaveURL(new RegExp(`${TARGET_PATH}$`));
   });
 
-  const dynamic = await request.get(`${baseURL}/dynamic?_rsc`, { headers: fullHeaders });
-  expect(dynamic.ok()).toBe(true);
-  expect(dynamic.headers()["cache-control"]).toContain("no-store");
-  expect(dynamic.headers()["cf-cache-status"]).toBe("BYPASS");
+  await runFresh(async (page) => {
+    const dynamicResponsePromise = page.waitForResponse((response) => {
+      const request = response.request();
+      return new URL(response.url()).pathname === "/dynamic" && request.headers().rsc === "1";
+    });
+    await gotoCurrentBuild(page, "/prewarm/dynamic");
+    const dynamic = await dynamicResponsePromise;
+    rejectStaleSeedWorker(dynamic);
+    expect(dynamic.ok()).toBe(true);
+    expect(dynamic.headers()["cache-control"]).toContain("no-store");
+    expect(dynamic.headers()["cf-cache-status"]).toBe("BYPASS");
+  });
 });