Infer controller.request.path_params["controller"] from the file being

rendered in a view spec.

- Closes #172.

README.markdown

@@ -148,6 +148,16 @@ View specs live in spec/views, and mix in ActionView::TestCase::Behavior.
       end
     end
 
+View specs infer the controller name and path from the path to the view
+template. e.g. if the template is "events/index.html.erb" then:
+
+    controller.controller_path == "events"
+    controller.request.path_parameters[:controller] == "events"
+
+This means that most of the time you don't need to set these values. When
+spec'ing a partial that is included across different controllers, you _may_
+need to override these values before rendering the view.
+
 ## `assign(key, val)`
 
 Use this to assign values to instance variables in the view:

features/view_specs/inferred_controller_path.feature

@@ -0,0 +1,21 @@
+Feature: view spec infers controller path
+
+  Scenario:
+    Given a file named "app/views/widgets/other.html.erb" with:
+      """
+      <%= link_to "new", :action => "new" %>
+      """
+    And a file named "spec/views/widgets/other.html.erb_spec.rb" with:
+      """
+      require "spec_helper"
+
+      describe "widgets/other.html.erb" do
+        it "includes a link to new" do
+          render
+          rendered.should have_selector("a", :href => "/widgets/new")
+        end
+      end
+      """
+    When I run "rspec spec/views"
+    Then the output should contain "1 example, 0 failures"
+

lib/rspec/rails/example/view_example_group.rb

@@ -130,6 +130,7 @@ def _include_controller_helpers
       before do
         _include_controller_helpers
         controller.controller_path = _controller_path
+        controller.request.path_parameters["controller"] = _controller_path
       end
     end