question: public void testSignumNegative ( ) { byte aBytes [ ] = { 12 , 56 , 100 , - 2 , - 76 , 89 , 45 , 91 , 3 , - 15 , 35 , 26 , 3 , 91 } ; int aSign = - 1 ; BigInteger aNumber = new BigInteger ( aSign , aBytes ) ; assertEquals ( "incorrect sign" , - 1 , aNumber . signum ( ) ) ; }
target:  signum() of a negative number.