Use helper method for alert messages.
Generate sessions controller.
Generate integration test for authentication pages.
Amend FactoryGirl user definition.
Test signing in and out.
Create routing resources for sessions;
match the routes '/signin' and '/signout'.
Define #create and #destroy actions for sessions.
Add helper methods for session management.
Allow use of session helper methods.
Create a form for signing in.
Amend the header partial so that its content varies
depending on the session status.
Add view content that is contingent upon
sign-in status to a partial.
Delete the session_token cookie after signout.
Test that a user is signed in after signing up.
Have #create action sign in an newly created user.
Create custom rspec matcher.
Use #form_tag instead of #form_for.