Add email validation plugin from:

git://github.com/dancroak/validates_email_format_of.git

vendor/plugins/validates_email_format_of/test/test_helper.rb

@@ -0,0 +1,47 @@
+$:.unshift(File.dirname(__FILE__) + '/../lib')
+
+require 'rubygems'
+require 'active_record'
+require 'active_record/base'
+
+require 'validates_email_format_of'
+
+ActiveRecord::Base.establish_connection(
+  :adapter  => 'sqlite3',
+  :database => ':memory:')
+
+ActiveRecord::Schema.define(:version => 0) do
+  create_table :users, :force => true do |t|
+    t.column 'email', :string
+  end
+end
+
+class Person < ActiveRecord::Base
+  validates_email_format_of :email, :on => :create, :message => 'fails with custom message', :allow_nil => true
+end
+
+require 'test/unit'
+require 'shoulda'
+require "#{File.dirname(__FILE__)}/../init"
+
+class Test::Unit::TestCase #:nodoc:
+  def self.should_allow_values(klass,*good_values)
+    good_values.each do |v|
+      should "allow email to be set to #{v.inspect}" do
+        user = klass.new(:email => v)
+        user.save
+        assert_nil user.errors.on(:email)
+      end
+    end
+  end
+
+  def self.should_not_allow_values(klass,*bad_values)
+    bad_values.each do |v|
+      should "not allow email to be set to #{v.inspect}" do
+        user = klass.new(:email => v)
+        assert !user.save, "Saved user with email set to \"#{v}\""
+        assert user.errors.on(:email), "There are no errors set on email after being set to \"#{v}\""
+      end
+    end
+  end
+end

vendor/plugins/validates_email_format_of/test/validates_email_format_of_test.rb

@@ -0,0 +1,37 @@
+require File.dirname(__FILE__) + '/test_helper'
+require File.dirname(__FILE__) + '/../shoulda_macros/validates_email_format_of'
+
+class User < ActiveRecord::Base
+  validates_email_format_of :email,
+    :on        => :create,
+    :message   => 'fails with custom message',
+    :allow_nil => true
+end
+
+class ValidatesEmailFormatOfTest < Test::Unit::TestCase
+  should_validate_email_format_of_klass(User, :email)
+
+  context 'An invalid user on update' do
+    setup do
+      @user = User.new(:email => 'dcroak@thoughtbot.com')
+      assert @user.save
+      assert @user.update_attribute(:email, '..dcroak@thoughtbot.com')
+    end
+
+    should 'pass validation' do
+      assert @user.valid?
+      assert @user.save
+      assert_nil @user.errors.on(:email)
+    end
+  end
+
+  context 'A user with a nil email' do
+    setup { @user = User.new(:email => nil) }
+
+    should 'pass validation' do
+      assert @user.valid?
+      assert @user.save
+      assert_nil @user.errors.on(:email)
+    end
+  end
+end