assertSame(tree, result);
        verify(handle, times(1)).ensureTreeConnected();
    }

    @Test
    @DisplayName("ensureOpen delegates to handle")
    void ensureOpen_delegates() throws Exception {
        // Verify ensureOpen() delegates to SmbPipeHandleImpl
        SmbPipeInputStream stream = newStreamWithMinimalStubs(true);
        when(handle.ensureOpen()).thenReturn(fd);