assertDoesNotThrow(() -> outputStream.write(data, 5, 5)); // valid - will consume second mock (5)
    }

    @Test
    void testAppendMode() throws IOException, CIFSException {
        // Given
        when(mockTreeHandle.isSMB2()).thenReturn(true);
        when(mockTreeHandle.getSendBufferSize()).thenReturn(65536);

        // Reset to read-write for cleanup
        file.setReadWrite();
        assertTrue(file.canWrite(), "File should be writable after setReadWrite");
    }

    @Test
    void testAppendMode() throws Exception {
        // Test SMB file append mode
        long timestamp = System.currentTimeMillis();
        SmbFile file = new SmbFile(baseUrl + "shared/append_" + timestamp + ".txt", context);