Gem Plugin does not load rails/init.rb when config.gem is placed in development.rb

I can confirm this issue in Rails 2.3.5. Here are steps to reproduce:

Add the following to config/test.rb:

config.gem "webrat"
config.gem "contest"
config.gem "stories"

Generate a new integration test and add the following in the test class:

story "Show that the bug is valid" do
  scenario "With webrat" do
    visit "/"
  end
end

Install gems with rake gems:install and then rake test:integration. The test will fail:

Started
E
Finished in 0.051676 seconds.

  1) Error:
test_With_webrat(SignUpTest::TestShowThatTheBugIsValid):
NoMethodError: undefined method `visit' for #<SignUpTest::TestShowThatTheBugIsValid:0x102288180>
    /test/integration/sign_up_test.rb:8:in `test_With_webrat'

1 tests, 0 assertions, 0 failures, 1 errors

It fails because the code in rails/init.rb in the Stories gem is not executed.

Note that configuring the gem dependencies in config/environment.rb, like Brad says, works as expected. (Also note that you can wrap those same dependencies with if RAILS_ENV == "test" to load them only in the test environment.)