}

    // Edge: unknown service returns null per stub
    @Test
    @DisplayName("getSmbTree unknown service returns null as stubbed")
    void getSmbTree_unknownService() {
        when(session.getSmbTree(eq("share"), eq("UNKNOWN"))).thenReturn(null);
        assertNull(session.getSmbTree("share", "UNKNOWN"));
        verify(session).getSmbTree("share", "UNKNOWN");
    }