cos.write(new byte[] { 0, 1, 2 });
        cos.flush();
        assertTrue(cos.isInMemory());
        cos.close();
    }

    @Test
    public void testFlushInFile() throws IOException {
        // flush() should work with file-based data
        ContentOutputStream cos = new ContentOutputStream(5, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2, 3, 4, 5 });