This gist demonstrates a bug in the interaction of routing with controller tests in Rails 3.2.9 (also tested on 3.2.8) If you have a `match` or `get` route which uses `redirect` as its destination, then the route behaves like a catch all, allowing any controller/action combination. You can see that in the `rake routes` output below, which shows …

posts_controller.rb

class PostsController < ApplicationController
  def index
    render :text => "Test message"
  end
end

posts_controller_test.rb

require 'test_helper'

class PostsControllerTest < ActionController::TestCase
  test "indexes" do
    # This test should fail, as the index route hasn't been defined.
    get(:index)
  end
end

rake routes

b  /b(.:format) :controller#:action

routes.rb

WtfRoutes::Application.routes.draw do
  # THIS IS THE MAGIC SAUCE. This route reports as `:controller#:action`, behaving as a catch all route in your tests
  # The leading slash seems to be important
  match '/b' => redirect("whatever")
  
  # Can also use `get` instead of `match` here and see the same problem.
end

test-case.diff

diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
new file mode 100644
index 0000000..5aa8bb8
--- /dev/null
+++ b/app/controllers/posts_controller.rb
@@ -0,0 +1,5 @@
+class PostsController < ApplicationController
+  def index
+    render :text => "Test message"
+  end
+end
diff --git a/config/routes.rb b/config/routes.rb
index 1dbf33e..c9bbaa6 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,2 +1,5 @@
 WtfRoutes::Application.routes.draw do
+  # THIS IS THE MAGIC SAUCE. This route reports as `:controller#:action`, behaving as a catch all route in your tests
+  # The leading slash seems to be important
+  match '/b' => redirect("whatever")
 end
diff --git a/test/functional/posts_controller_test.rb b/test/functional/posts_controller_test.rb
new file mode 100644
index 0000000..d40b39b
--- /dev/null
+++ b/test/functional/posts_controller_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class PostsControllerTest < ActionController::TestCase
+  test "indexes" do
+    get(:index)
+  end
+end