add test helper full_title

test/helpers/application_helper_test.rb

+require 'test_helper'
+
+class ApplicationHelperTest < ActionView::TestCase
+	test "full title helper" do
+		assert_equal full_title, "Ruby on Rails Tutorial Sample App"
+		assert_equal full_title("Help"), "Help | Ruby on Rails Tutorial Sample App"
+	end
+end
\ No newline at end of file

test/integration/site_layout_test.rb

@@ -8,5 +8,7 @@ class SiteLayoutTest < ActionDispatch::IntegrationTest
   	assert_select "a[href=?]", help_path
   	assert_select "a[href=?]", about_path
   	assert_select "a[href=?]", contact_path
+  	get signup_path
+  	assert_select "title", full_title("Sign up")
   end
 end

test/test_helper.rb

@@ -5,6 +5,7 @@ require 'rails/test_help'
 class ActiveSupport::TestCase
   # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
   fixtures :all
+  include ApplicationHelper
 
   # Add more helper methods to be used by all tests here...
 end