Restful Authentication Test Problem

I am reletively a newbie to Rails. I utilized Restful Authentication
plugin from techno-weenie for a new application I am developing.
(http://svn.techno-weenie.net/projects/plugins/
restful_authentication/)
I wanted my application to be test driven (TTD). All went smoothly
until I added a validates_presence_of validation to a new model
attribute (address) I introduced to the User model and then try to run
the test. The test failed claming the new attribute I supplied was
nil.

Here what I did:

1) Added a new field (address) to the users table using a migration.
2) Included a validates_presence_of :address to the User model.
3) changed the user_test accordingly.

def create_user(options = {})
    User.create({:login => 'quire', :email =>
'quire@example.com', :password => 'quire', :password_confirmation =>
'quire', :address => 'myaddress' }.merge(options))
  end

4) run the unit test by rake test:units

The test failed and it seems the value for the address field didn't
get saved in the test database.

I tried recreating the test database with rake db:test:clone, rake
db:test:clone_structure but failed again.

I use SQLite3 as the database.

Please help me to overcome this issue.

Thank you.