assertNotNull( attribute );
assertNull( attribute );
    public void testModifyOperation() throws NamingException    {        Attributes attributes = new BasicAttributes();        attributes.put( "ou", "testCases" );        sysRoot.modifyAttributes( "ou=testing00", DirContext.ADD_ATTRIBUTE, attributes );        attributes = null;        DirContext ctx = ( DirContext ) sysRoot.lookup( "ou=testing00" );        attributes = ctx.getAttributes( "" );        assertTrue( attributes.get( "ou" ).contains( "testCases" ) );        Attribute attribute;        attribute = attributes.get( "creatorsName" );        assertNotNull( attribute );        attribute = attributes.get( "createTimestamp" );        assertNotNull( attribute );        attribute = attributes.get( "modifiersName" );        assertNotNull( attribute );        attributes.get( "modifyTimestamp" );        assertNotNull( attribute );    }