### Question:
UserId { public byte[] getInternal() { return internal; } UserId(String userName);  UserId(String userName, int registerDate);  UserId(String userName, int registerDate, byte[] internal); byte[] getInternal(); String getUserName(); int getRegisterDate(); @SuppressWarnings("deprecation") final String toString(); final String convertToString(); @Override int hashCode(); @Override boolean equals(Object obj); final static UserId valueOf(String userIdString); final static UserId fromString(String userIdString); final static UserId fromBytes(byte[] bytes);  }### Answer:
@Test public void testCompare() { UserId testId1 = new UserId("test001"); UserId testId2 = new UserId("test001"); assertArrayEquals(testId1.getInternal(), testId2.getInternal()); }