"The goggles, they do nothing!" `rake db:test:prepare` appears to have become `rake test:prepare` in Rails 4, but the old task still exists and does nothing. http://stackoverflow.com/q/17150529/4937

gistfile1.sh

$ rake --trace db:test:prepare
** Invoke db:test:prepare (first_time)
** Execute db:test:prepare

$ rake --trace test:prepare
** Invoke test:prepare (first_time)
** Invoke db:test:prepare (first_time)
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:test:purge
** Execute db:test:load
** Invoke db:test:load_schema (first_time)
** Invoke db:test:purge
** Execute db:test:load_schema
** Invoke db:schema:load (first_time)
** Invoke environment
** Invoke db:load_config
** Execute db:schema:load
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment
** Execute db:abort_if_pending_migrations
** Execute test:prepare