diff --git a/apps/ai-game-creator-shell/src-tauri/src/process_session/tests.rs b/apps/ai-game-creator-shell/src-tauri/src/process_session/tests.rs
index f7a0acc12..3a890ead3 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/process_session/tests.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/process_session/tests.rs
@@ -1399,10 +1399,21 @@ process.stdin.resume();
         )
         .expect("poll ready");
     }
-    let eof = write_process_session_stdin_at(root, &identity, &poll.process_id, "", false, true)
-        .expect("close stdin");
-    assert!(eof.eof);
-    assert!(!eof.stdin_open);
+    // 自然 EOF 与本用例显式 close 存在竞态：PTY 在负载下可能先收到流 EOF，
+    // 子进程随即退出并把会话置为终态，此时 close 会以「已进入终态」拒绝。
+    // 该终态正是用例要验证的收敛结果，因此只在会话仍未终止时要求 close 成功。
+    match write_process_session_stdin_at(root, &identity, &poll.process_id, "", false, true) {
+        Ok(eof) => {
+            assert!(eof.eof);
+            assert!(!eof.stdin_open);
+        }
+        Err(error) => {
+            assert!(
+                error.contains("已进入终态"),
+                "closing stdin failed for a non-terminal session: {error}"
+            );
+        }
+    }
     let mut tail = String::new();
     for _ in 0..20 {
         poll = poll_process_session_at(