byte[] result = cos.getData();
        assertNotNull(result);
        assertArrayEquals(data, result);
        cos.close();
    }

    @Test
    public void testFlushInMemory() throws IOException {
        // flush() should work with in-memory data
        ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2 });
        cos.flush();