(red) Write failing test => Signing up with email displays failure
message
(green) Make test pass => Signing up with email displays failure
message
(green) Write passing test => SignUpsController#update creates error
on @sign_up with invalid input
(red) SignUpsController#update redirects to sign_up_path(@sign_up)
with valid input
(red) Write failing test => SignUp route GET /sign_ups/:id routes to
show
(green) Make test pass => SignUp route GET /sign_ups/:id routes to
show
(green) Make test pass => SignUpsController#update redirects to
sign_up_path(@sign_up) with valid input
(red) Write failing test => SignUpsController#show sets @sign_up
(green) Make test pass => SignUpsController#show sets @sign_up
(green) Make test pass => Signing up with email displays success
message