}).when(raf).read(any(byte[].class), anyInt(), eq(3));
        assertEquals("abc", raf.readUTF());
    }

    @Test
    @DisplayName("write(boolean/byte): writes single byte")
    void write_oneByteVariants() throws Exception {
        SmbRandomAccessFile raf = spy(newInstance("rw", false, true, false));
        // Intercept the 3-arg write to validate len