Failure of sql-bench test?

[Xu Qiang]

I "cd /usr/local/mysql/sql-bench" and "perl run_all_tests", just to get the following
error: 
-------------------------------------------------------------
Got error: 'Access denied for user 'root'@'localhost' (using password: NO)' when
connecting to DBI:mysql:database=test;host=localhost with user: '' password: ''
-------------------------------------------------------------

By the way, before doing the bench test, I did this operation: 
/usr/local/mysql/bin/mysqladmin -u root password 'new-password'
/usr/local/mysql/bin/mysqladmin -u root -h gso_dev_2.workgroup password 'new-password'

Is this the cause? 

How to let the bench test run?

Thanks in advance, 

Regards,
Xu Qiang