assertEquals('A', stream.read());
        assertEquals('B', stream.read());
        assertEquals('C', stream.read());
        assertEquals(-1, stream.read()); // EOF
    }

    public void test_readBytes_delegatesToUnderlying() throws IOException {
        // Test that read(byte[]) delegates to underlying stream
        byte[] data = "Hello World".getBytes();
        InputStream underlyingStream = new ByteArrayInputStream(data);