byte[] buf = new byte[4];
        assertEquals(0, raf.read(buf, 0, 0));
    }

    @Test
    @DisplayName("read(): returns -1 when underlying read reports EOF")
    void read_returnsMinusOne_onEOF() throws Exception {
        SmbRandomAccessFile raf = spy(newInstance("r", false, false, false));
        // Stub the 3-arg read to signal EOF
        doReturn(-1).when(raf).read(any(byte[].class), anyInt(), eq(1));