### Question:
RLP { public static byte[] encodeListHeader(int size) { if (size == 0) { return BYTES_SHORT_LIST; } byte[] header; if (size < SIZE_THRESHOLD) { header = new byte[] {(byte) (OFFSET_SHORT_LIST + size)}; } else { int tmpLength = size; byte byteNum = 0; while (tmpLength != 0) { ++byteNum; tmpLength >>>= 8; } header = new byte[1 + byteNum]; header[0] = (byte) (OFFSET_LONG_LIST + byteNum); for (int i = 0; i < byteNum; i++) { header[byteNum - i] = (byte) (size >>> (8 * i)); } } return header; }  static int decodeInt(byte[] data, int index); static BigInteger decodeBigInteger(byte[] data, int index); static RLPList decode2(byte[] msgData); static RLPElement decode2OneItem(byte[] msgData, int startPos); static DecodeResult decode(byte[] data, int pos); static byte[] encode(Object input); static byte[] encodeLength(int length, int offset); static byte[] encodeByte(byte singleByte); static byte[] encodeShort(short singleShort); static byte[] encodeInt(int singleInt); static byte[] encodeLong(long l); static byte[] encodeString(String srcString); static byte[] encodeBigInteger(BigInteger srcBigInteger); static byte[] encodeElement(byte[] srcData); static int calcElementPrefixSize(byte[] srcData); static byte[] encodeListHeader(int size); static byte[] encodeLongElementHeader(int length); static byte[] encodeList(byte[]... elements);  }### Answer:
@Test public void testEncodeListHeader() { byte[] header = encodeListHeader(0); String expected_0 = "c0"; assertEquals(expected_0, Hex.toHexString(header)); header = encodeListHeader(10); String expected_1 = "ca"; assertEquals(expected_1, Hex.toHexString(header)); header = encodeListHeader(1000); String expected_2 = "f903e8"; assertEquals(expected_2, Hex.toHexString(header)); header = encodeListHeader(1000000000); String expected_3 = "fb3b9aca00"; assertEquals(expected_3, Hex.toHexString(header)); }