## user.rb
class User < ActiveRecord::Base
  validates_presence_of :username
  validates_presence_of :email
  validates_as_email :email
  validates_format_of :username, :with => /^[A-Za-z][\w_]{2,}$/
  validates_uniqueness_of :username, :message => "That username is already taken. Please try selecting another one"
  validates_uniqueness_of :email, :message => "That email is already signed up"
end

## user_spec.rb
require File.dirname(__FILE__)   '/../spec_helper'

module UserSpecHelper
  def valid_user_attributes
    {
      :email => 'joe@bloggs.com',
      :username => 'joebloggs',
      :password => 'abcdefg'
    }
  end
end

context "A user (in general)" do
  fixtures :users
  include UserSpecHelper

  setup do
    @user = User.new
  end

  specify "should be invalid without a username" do
    @user.attributes = valid_user_attributes.except(:username)
    @user.should_not_be_valid
    @user.username = 'username'
    @user.should_be_valid
  end

  specify "should be invalid without an email address" do
    @user.attributes = valid_user_attributes.except(:email)
    @user.should_not_be_valid
    @user.email = "bob@bob.com"
    @user.should_be_valid
  end

  specify "should be invalid with a bad email address" do
    @user.attributes = valid_user_attributes.except(:email)
    @user.should_not_be_valid
    @user.email = "@bob.com"
    @user.should_not_be_valid
    @user.email = "Max@job 3:14"
    @user.should_not_be_valid
    @user.email = "bob@bob.com"
    @user.should_be_valid
  end

  specify "should be invalid with a username clash" do
    @user.attributes = valid_user_attributes.except(:username)
    @user.username = "dave"
    @user.should_not_be_valid
    @user.errors.on(:username).should_match /That username is already taken. Please try selecting another one/
    @user.username = "unique"
    @user.should_be_valid
  end

  specify "should be invalid with an email address clash" do
    @user.attributes = valid_user_attributes.except(:email)
    @user.email = "dave@bob.com"
    @user.should_not_be_valid
    @user.errors.on(:email).should_match /That email is already signed up/
    @user.email = "me@you.com"
    @user.should_be_valid
  end

  specify "should be invalid with illegal characters in username" do
    @user.attributes = valid_user_attributes.except(:username)
    @user.username = "da"
    @user.should_not_be_valid
    @user.username = "dave thomas"
    @user.should_not_be_valid
    @user.username = "bob-woodward"
    @user.should_not_be_valid
    @user.username = "_dopefiend"
    @user.should_not_be_valid
    @user.username = "bob_lee"
    @user.should_be_valid
  end
end