Running rake test:units when MSsql root has a password

Is there a way to pass the root password for my local mysql
installation to rake test:units. It seems to want to connect with root
by default. Can I change that or pass the root pwd on the CL?

c:\ror2\learn>rake test:units
(in c:/ror2/learn)
rake aborted!
Access denied for user ‘root’@‘localhost’ (using password: NO)

(See full trace by running task with --trace)

c:\ror2\learn>