I was running guard
and here's the specific backtrace, although it might not help since it's specific to my testing setup:
Running: test/functional/signups_controller_test.rb
/Users/JackC/.rvm/gems/ruby-1.9.3-p194@kickpuncher/gems/minitest-3.0.0/lib/minitest/spec.rb:68:in `describe': undefined method `create' for ActionController::TestCase:Class (NoMethodError)
from /Users/JackC/Development/kickpuncher/test/functional/signups_controller_test.rb:3:in `<top (required)>'
from -e:in `require'
Gemfile: