question: public void testClose ( ) throws Exception { byte [ ] data = new byte [ ] { - 127 , - 100 , - 50 , - 10 , - 1 , 0 , 1 , 10 , 50 , 127 } ; TestInputStream tis = new TestInputStream ( data ) ; CipherInputStream cis = new CipherInputStream ( tis , new NullCipher ( ) ) ; cis . close ( ) ; assertTrue ( "The close() method should call the close() method " + "of its underlying input stream." , tis . wasClosed ( ) ) ; }
target:  close() method testing. Tests that the method calls the close() method of the underlying input stream.