raf.seek(123L);
        assertEquals(123L, raf.getFilePointer());
    }

    @Test
    @DisplayName("length(): delegates to SmbFile.length()")
    void length_delegates() throws Exception {
        SmbRandomAccessFile raf = newInstance("r", false, false, false);
        SmbFile file = (SmbFile) getField(raf, "file");
        when(file.length()).thenReturn(42L);