question: public void testBitLengthPositive3 ( ) { byte aBytes [ ] = { 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 } ; int aSign = 1 ; BigInteger aNumber = new BigInteger ( aSign , aBytes ) ; assertEquals ( 81 , aNumber . bitLength ( ) ) ; }
target:  bitLength() of a positive number which is a power of 2