### Question:
EncodeUtils { public static byte[] longToByteArray(long longValue) { ByteBuffer longToByteBuffer = ByteBuffer.allocate(Long.BYTES); longToByteBuffer.putLong(longValue); return longToByteBuffer.array(); } private  EncodeUtils(); static byte[] longToByteArray(long longValue); static long byteArrayToLong(byte[] byteArray);  }### Answer:
@Test public void longToByteArrayTest() { long value = 1234L; byte[] byteValue = EncodeUtils.longToByteArray(value); assertEquals(8, byteValue.length); assertEquals(-46, byteValue[7]); assertEquals(4, byteValue[6]); }