test(gateway): avoid brittle shutdown timer assertion

Co-authored-by: Han Kim <han.kim@Bowcaster.local>
Co-authored-by: Peter Steinberger <peter@steipete.me>

src/gateway/server-close.test.ts

@@ -937,11 +937,12 @@ describe("createGatewayCloseHandler", () => {
   it("fails shutdown when http server close still hangs after force close", async () => {
     vi.useFakeTimers();
 
+    const closeAllConnections = vi.fn();
     const close = createGatewayCloseHandler(
       createGatewayCloseTestDeps({
         httpServer: {
           close: () => undefined,
-          closeAllConnections: vi.fn(),
+          closeAllConnections,
           closeIdleConnections: vi.fn(),
         } as never,
       }),
@@ -953,7 +954,13 @@ describe("createGatewayCloseHandler", () => {
     );
     await vi.advanceTimersByTimeAsync(HTTP_CLOSE_GRACE_MS + HTTP_CLOSE_FORCE_WAIT_MS);
     await closeExpectation;
-    expect(vi.getTimerCount()).toBe(0);
+
+    expect(closeAllConnections).toHaveBeenCalledTimes(1);
+    expect(
+      mocks.logWarn.mock.calls.some(([message]) =>
+        String(message).includes("http-server close exceeded 1000ms"),
+      ),
+    ).toBe(true);
   });
 
   it("labels warnings for multiple HTTP servers with their index", async () => {