// Assert
        assertEquals(8192, size);
        verify(handle).getSendBufferSize();
    }

    @Test
    @DisplayName("getSendBufferSize(): propagates CIFSException on failure")
    void getSendBufferSize_throws() throws Exception {
        // Arrange
        when(handle.getSendBufferSize()).thenThrow(new CIFSException("send size failed"));

        // Act + Assert