https://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/4759-rake-testfunctionalsunits-loads-the-environment-twice#ticket-4759-5

rake test output 3.0.4

(in /home/roger/dev/trivial/temp/raketest)
** Invoke test (first_time)
** Execute test
** Invoke test:units (first_time)
** Invoke test:prepare (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
ENV LOADED !
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment 
** Execute db:test:purge
** Execute db:test:load
** Invoke db:schema:load (first_time)
** Invoke environment 
** Execute db:schema:load
** Execute test:prepare
** Execute test:units
ENV LOADED !
Loaded suite /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.
Finished in 0.027144 seconds.

1 tests, 1 assertions, 0 failures, 0 errors
** Invoke test:functionals (first_time)
** Invoke test:prepare 
** Execute test:functionals
ENV LOADED !
Loaded suite /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.......
Finished in 0.171518 seconds.

7 tests, 10 assertions, 0 failures, 0 errors
** Invoke test:integration (first_time)
** Invoke test:prepare 
** Execute test:integration

rake test output rails edge

(in /home/roger/dev/trivial/temp/raketest)
** Invoke test (first_time)
** Execute test
** Invoke test:units (first_time)
** Invoke test:prepare (first_time)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke test:functionals (first_time)
** Invoke test:prepare 
** Execute test:functionals
/home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb:23: uninitialized constant Rack::Session::Abstract::SessionHash (NameError)
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/actionpack/lib/action_dispatch/middleware/session/cookie_store.rb:3
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application/configuration.rb:116:in `const_get'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application/configuration.rb:116:in `session_store'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application.rb:166:in `default_middleware_stack'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application.rb:146:in `tap'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application.rb:146:in `default_middleware_stack'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/engine.rb:412:in `build_middleware_stack'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application/finisher.rb:37
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/initializable.rb:25:in `instance_exec'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/initializable.rb:25:in `run'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/initializable.rb:50:in `run_initializers'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/initializable.rb:49:in `each'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/initializable.rb:49:in `run_initializers'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/application.rb:93:in `initialize!'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/railtie/configurable.rb:28:in `send'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@rails-edge/bundler/gems/rails-8276a240207a/railties/lib/rails/railtie/configurable.rb:28:in `method_missing'
	from /home/roger/dev/trivial/temp/raketest/config/environment.rb:5
	from ./test/test_helper.rb:2:in `require'
	from ./test/test_helper.rb:2
	from ./test/functional/users_controller_test.rb:1:in `require'
	from ./test/functional/users_controller_test.rb:1
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `load'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5:in `each'
	from /home/roger/.rvm/gems/ruby-1.8.7-p330@global/gems/rake-0.8.7/lib/rake/rake_test_loader.rb:5
** Invoke test:integration (first_time)
** Invoke test:prepare 
** Execute test:integration
Errors running test:units, test:functionals!