cos.write(new byte[] { 5 });
        assertTrue(cos.isInMemory());
        assertFalse(cos.done);
        cos.close();
    }

    @Test
    public void testMultipleWritesExceedingThreshold() throws IOException {
        // Multiple writes that exceed threshold should switch to file
        ContentOutputStream cos = new ContentOutputStream(5, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2 });