title: Hartl's sample_app warning on config.serve_static_files, and test already defined
body: <p>I am trying to test Hartl's sample_app and this is message that I get after running <code>bundle exec rake test</code>:  </p>
  
  <pre><code>DEPRECATION WARNING: The configuration option `config.serve_static_assets` has been renamed to `config.serve_static_files` to clarify its role (it merely enables serving everything in the `public` folder and is unrelated to the asset pipeline). The `serve_static_assets` alias will be removed in Rails 5.0. Please migrate your configuration files accordingly. (called from block in &lt;top (required)&gt; at /home/aki/sample_app/config/environments/test.rb:16)
  rake aborted!
  test_should_be_valid is already defined in UserTest
  /home/aki/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0/lib/active_support/testing/declarative.rb:14:in `test'
  /home/aki/sample_app/test/models/user_test.rb:10:in `&lt;class:UserTest&gt;'
  /home/aki/sample_app/test/models/user_test.rb:3:in `&lt;top (required)&gt;'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (3 levels) in define'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `each'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:114:in `block (2 levels) in define'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `each'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:113:in `block in define'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/sub_test_task.rb:20:in `invoke_rake_task'
  /home/aki/.rvm/gems/ruby-2.1.3/gems/railties-4.2.0/lib/rails/test_unit/testing.rake:8:in `block in &lt;top (required)&gt;'
  Tasks: TOP =&gt; test:run
  (See full trace by running task with --trace)
  </code></pre>
  
  <p>This is <code>test/integration/users_profile_test.rb</code> file.</p>
  
  <pre><code>require 'test_helper'
  
  class UsersProfileTest &lt; ActionDispatch::IntegrationTest
    include ApplicationHelper
  
    def setup
      @user = users(:michael)
    end
  
    test "profile display" do
      get user_path(@user)
      assert_template 'users/show'
      assert_select 'title', full_title(@user.name)
      assert_select 'h1', text: @user.name
      assert_select 'h1&gt;img.gravatar'
      assert_match @user.microposts.count.to_s, response.body
      assert_select 'div.pagination'
      @user.microposts.paginate(page: 1).each do |micropost|
        assert_match micropost.content, response.body
      end
    end
  end
  </code></pre>
  
  <p>And this is <code>sample_app/config/environments/test.rb</code> file:</p>
  
  <pre><code>Rails.application.configure do
    # Settings specified here will take precedence over those in config/application.rb.
  
    # The test environment is used exclusively to run your application's
    # test suite. You never need to work with it otherwise. Remember that
    # your test database is "scratch space" for the test suite and is wiped
    # and recreated between test runs. Don't rely on the data there!
    config.cache_classes = true
  
    # Do not eager load code on boot. This avoids loading your whole application
    # just for the purpose of running a single test. If you are using a tool that
    # preloads Rails for running tests, you may have to set it to true.
    config.eager_load = false
  
    # Configure static asset server for tests with Cache-Control for performance.
    config.serve_static_assets  = true
    config.static_cache_control = 'public, max-age=3600'
  
    # Show full error reports and disable caching.
    config.consider_all_requests_local       = true
    config.action_controller.perform_caching = false
  
    # Raise exceptions instead of rendering exception templates.
    config.action_dispatch.show_exceptions = false
  
    # Disable request forgery protection in test environment.
    config.action_controller.allow_forgery_protection = false
  
    # Tell Action Mailer not to deliver emails to the real world.
    # The :test delivery method accumulates sent emails in the
    # ActionMailer::Base.deliveries array.
    config.action_mailer.delivery_method = :test
    config.action_mailer.default_url_options = { host: 'localhost:3000' }
    # Randomize the order test cases are executed.
    config.active_support.test_order = :random
  
    # Print deprecation notices to the stderr.
    config.active_support.deprecation = :stderr
  
    # Raises error for missing translations
    # config.action_view.raise_on_missing_translations = true
  end
  </code></pre>
  
  <p>This is <code>test/models/user_test.rb</code>.</p>
  
  <pre><code>require 'test_helper'
  
  class UserTest &lt; ActiveSupport::TestCase
  
    def setup
      @user = User.new(name: "Example User", email: "user@example.com",
                       password: "foobar", password_confirmation: "foobar")
    end
  
  
    test "should be valid" do
      assert @user.valid?
    end
  
    test "name should be present" do
      @user.name = "     "
      assert_not @user.valid?
    end
  
    test "email should be present" do
      @user.email = "     "
      assert_not @user.valid?
    end
  
    test "name should not be too long" do
      @user.name = "a" * 51
      assert_not @user.valid?
    end
  
    test "email should not be too long" do
      @user.email = "a" * 244 + "@example.com"
      assert_not @user.valid?
    end
  
    test "email validation should accept valid addresses" do
      valid_addresses = %w[user@example.com USER@foo.COM A_US-ER@foo.bar.org
                           first.last@foo.jp alice+bob@baz.cn]
      valid_addresses.each do |valid_address|
        @user.email = valid_address
        assert @user.valid?, "#{valid_address.inspect} should be valid"
      end
    end
  
    test "email validation should reject invalid addresses" do
      invalid_addresses = %w[user@example,com user_at_foo.org user.name@example.
                             foo@bar_baz.com foo@bar+baz.com]
      invalid_addresses.each do |invalid_address|
        @user.email = invalid_address
        assert_not @user.valid?, "#{invalid_address.inspect} should be invalid"
      end
    end
  
    test "email addresses should be unique" do
      duplicate_user = @user.dup
      duplicate_user.email = @user.email.upcase
      @user.save
      assert_not duplicate_user.valid?
    end
  
    test "password should have a minimum length" do
      @user.password = @user.password_confirmation = "a" * 5
      assert_not @user.valid?
    end
  
    test "authenticated? should return false for a user with nil digest" do
      assert_not @user.authenticated?(:remember, '')
    end
  
  test "associated microposts should be destroyed" do
      @user.save
      @user.microposts.create!(content: "Lorem ipsum")
      assert_difference 'Micropost.count', -1 do
        @user.destroy
      end
    end
  end
  </code></pre>
  
  <p>I am just walking trough instructions from tutorial so I don't know what I am doing wrong.. If you need some other files, I will post them..
  Are gem versions different maybe or is it something else?</p>