// 2 bytes should remain
        assertEquals(2, sis.available());
    }

    @Test
    @DisplayName("Multiple messages are read sequentially")
    void multipleMessagesAreReadSequentially() throws IOException {
        // Create two messages
        byte[] data1 = new byte[] { 1, 2 };
        byte[] data2 = new byte[] { 3, 4, 5 };