### Question:
Numeric { public static String toHexStringWithPrefix(BigInteger value) { return HEX_PREFIX + value.toString(16); } private  Numeric(); static String encodeQuantity(BigInteger value); static BigInteger decodeQuantity(String value); static String cleanHexPrefix(String input); static String prependHexPrefix(String input); static boolean containsHexPrefix(String input); static BigInteger toBigInt(byte[] value, int offset, int length); static BigInteger toBigInt(byte[] value); static BigInteger toBigInt(String hexValue); static BigInteger toBigIntNoPrefix(String hexValue); static String toHexStringWithPrefix(BigInteger value); static String toHexStringNoPrefix(BigInteger value); static String toHexStringNoPrefix(byte[] input); static String toHexStringWithPrefixZeroPadded(BigInteger value, int size); static String toHexStringNoPrefixZeroPadded(BigInteger value, int size); static byte[] toBytesPadded(BigInteger value, int length); static String littleEndian(long number); static byte[] hexStringToByteArray(String input); static String toHexString(byte[] input, int offset, int length, boolean withPrefix); static String toHexString(byte[] input); static String toHexString(String input); static byte asByte(int m, int n); static boolean isIntegerValue(BigDecimal value); static boolean isIntegerValue(String value); static List<Byte> intToBytes(int value);  }### Answer:
@Test public void testToHexStringWithPrefix() { Assertions.assertEquals(Numeric.toHexStringWithPrefix(BigInteger.TEN), "0xa"); }