8.1.1 Sessions controller
8.1.2 Signin tests (now fail.)
8.1.3 Signin form
8.1.4 Reviewing form submission
8.1.5 Rendering with a flash message
8.2.1 - 8.2.2: Remember me / A working sign_in method
8.2.3 Current user
8.2.4 Changing the layout links
8.2.5 Signin upon signup
8.2.6 Signing out
FOUND the reason for fail test. voila!!!