Implement user registration feature

* Add users/new action and view
* Add users/create action
* Add link to sign up in sign in page

app/controllers/users_controller.rb

@@ -0,0 +1,17 @@
+class UsersController < ApplicationController
+  skip_before_filter :authenticate!, :only => [:new, :create]
+
+  def new
+    @user = User.new
+  end
+
+  def create
+    @user = User.new(params[:user])
+    if ! @user.save
+      render :new
+    else
+      self.current_user =  @user
+      redirect_to :root
+    end
+  end
+end

app/views/sessions/new.html.haml

@@ -4,3 +4,4 @@
   = f.label :password
   = f.password_field :password
   = f.submit 'Sign in'
+= link_to 'Sign up', new_user_path

app/views/users/new.html.haml

@@ -0,0 +1,8 @@
+= form_for(@user, :url => users_path) do |f|
+  = f.label :email
+  = f.text_field :email
+  = f.label :password
+  = f.password_field :password
+  = f.label :password_confirmation
+  = f.password_field :password_confirmation
+  = f.submit 'Sign up'

config/routes.rb

@@ -1,4 +1,6 @@
 Scube::Application.routes.draw do
+  resources :users, :only => [:new, :create]
+
   resources :sessions, :only => [:new, :create]
 
   resources :tracks do

features/sessions.feature

@@ -15,3 +15,9 @@ Feature: User
     Then I should be redirected to the sign in page
     When I submit valid credentials
     Then I should be redirected to the home page
+
+  Scenario: User registration
+    Given I go to the home page
+    When I follow the sign up link
+    And I fill in the sign up form
+    Then I should be redirected to the home page

features/step_definitions/sessions_step.rb

@@ -21,3 +21,15 @@ When /^I submit valid credentials$/ do
   fill_in('Password', :with => user.password)
   click_button('Sign in')
 end
+
+When /^I follow the sign up link$/ do
+  click_link('Sign up')
+end
+
+When /^I fill in the sign up form$/ do
+  @user = Factory.build(:user)
+  fill_in('Email', :with => @user.email)
+  fill_in('Password', :with => @user.password)
+  fill_in('Password confirmation', :with => @user.password)
+  click_button('Sign up')
+end

spec/controllers/users_controller_spec.rb

@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe UsersController do
+  describe 'GET new' do
+    it 'assigns a new user as @user' do
+      get :new
+      assigns[:user].should be_a_new(User)
+    end
+  end
+
+  describe 'POST create' do
+    context 'whith valid params' do
+      it 'creates a new user' do
+        expect {
+          post :create, :user => Factory.attributes_for(:user)
+        }.to change(User, :count).by(1)
+      end
+
+      it 'signs the user in' do
+        post :create, :user => Factory.attributes_for(:user)
+        controller.current_user.should_not be_nil
+      end
+
+      it 'redirects to the home page' do
+        post :create, :user => Factory.attributes_for(:user)
+        response.should redirect_to(:root)
+      end
+    end
+
+    context 'whith invalid params' do
+      before { User.any_instance.stub(:save).and_return(false) }
+
+      it 'assigns the user as @user' do
+        post :create, :user => {}
+        assigns[:user].should be_a_new(User)
+      end
+
+      it 'renders the new template' do
+        post :create, :user => {}
+        response.should render_template('new')
+      end
+    end
+  end
+end

spec/views/sessions/new.html.haml_spec.rb

@@ -23,4 +23,9 @@ describe 'sessions/new.html.haml' do
     rendered.should \
       have_selector('label[for=session_password]', :text => 'Password')
   end
+
+  it 'renders a link to the sign in page' do
+    render
+    rendered.should have_selector("a[href='#{new_user_path}']", :text => 'Sign up')
+  end
 end

spec/views/users/new.html.haml_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+
+describe 'users/new.html.haml' do
+  let(:user) do
+    mock_model('User').as_new_record.as_null_object
+  end
+
+  before do
+    assign :user, user
+  end
+
+  it 'renders a form to sign up' do
+    render
+    rendered.should have_selector("form[method=post][action='#{users_path}']")
+    rendered.should have_selector('input[type=submit]')
+  end
+
+  it 'renders a text field with a label for the mail address' do
+    render
+    rendered.should have_selector(
+      "input[type=text][name='user[email]']"
+    )
+    rendered.should have_selector(
+      'label[for=user_email]', :text => 'Email'
+    )
+  end
+
+  it 'renders a password field with a label for the password' do
+    render
+    rendered.should have_selector(
+      "input[type=password][name='user[password]']"
+    )
+    rendered.should have_selector(
+      'label[for=user_password]', :text => 'Password'
+    )
+  end
+
+  it 'renders a password field with a label for the password confirmation' do
+    render
+    rendered.should have_selector(
+      "input[type=password][name='user[password_confirmation]']"
+    )
+    rendered.should have_selector(
+      'label[for=user_password_confirmation]',
+      :text => 'Password confirmation'
+    )
+  end
+end