diff --git a/tuku/test/test_settings_lock_host.c b/tuku/test/test_settings_lock_host.c
index 32be336..2dc0081 100644
--- a/tuku/test/test_settings_lock_host.c
+++ b/tuku/test/test_settings_lock_host.c
@@ -311,11 +311,13 @@ int main(void)
           "lock view consumes LONG_PRESS before the no-op callback");
     meow_input_touch_release();
     CHECK(meow_input_pop(&lp) == 0, "long-press release does not emit a stray TAP");
-    lock_tap_key(lock, LK_KOK);
-    CHECK(meow_ui_activity_active() == ACT_LOCK, "long-press backspace cleared input");
+    /* 「到底清没清空」不在这里断言：此刻缓冲只有 "135"（3 位），而确认在 <4 位时本就
+     * disabled，任何「仍停在 ACT_LOCK」的判断都恒真、测不出清空（M30 评审 P2-1）。
+     * 真正的判据是下一段：若没清空，缓冲会变成 "135"+"1357" = 7 位错码 → 校验失败。 */
     lock_type(lock, "1357");
     lock_tap_key(lock, LK_KOK);
-    CHECK(meow_ui_activity_active() == ACT_LIBRARY, "unlock after long-press clear");
+    CHECK(meow_ui_activity_active() == ACT_LIBRARY,
+          "unlock after long-press clear (7-digit buffer would fail if not cleared)");
 
     /* 解锁后 app.c 关掉长按：不得把长按语义泄漏到书库/阅读器（按住稍久的点击仍算 TAP）。 */
     meow_ui_set_long_press_cb(NULL);