1.Setup the Rails project in Subversion by following the Subversion Primer for Rails blog post.
2. Ran into problems while installing plugins and after reading the James Adams's plugin book, I found the solution, I had to do:
script/plugin install –o https://svn.greenpeace.org/repositories/rails_plugins/validates_as_email/tags/0.1.4
to install the plugin.
I also looked at the test directory of the plugin and did the same assert in my unit test.