Added a redirect_to matcher

lib/shoulda/action_controller/matchers.rb

@@ -6,6 +6,7 @@
 require 'shoulda/action_controller/matchers/respond_with_content_type_matcher'
 require 'shoulda/action_controller/matchers/set_session_matcher'
 require 'shoulda/action_controller/matchers/route_matcher'
+require 'shoulda/action_controller/matchers/redirect_to_matcher'
 
 module Shoulda # :nodoc:
   module ActionController # :nodoc:

lib/shoulda/action_controller/matchers/redirect_to_matcher.rb

@@ -0,0 +1,62 @@
+module Shoulda # :nodoc:
+  module ActionController # :nodoc:
+    module Matchers
+
+      # Ensures a controller redirected to the given url.
+      #
+      # Example:
+      #
+      #   it { should redirect_to('http://somewhere.com')  }
+      #   it { should redirect_to(users_path)  }
+      def redirect_to(url_or_description, &block)
+        RedirectToMatcher.new(url_or_description, self, &block)
+      end
+
+      class RedirectToMatcher # :nodoc:
+
+        def initialize(url_or_description, context, &block)
+          if block
+            @url_block = block
+            @location = @url_or_description
+          else
+            @url = url_or_description
+            @location = @url
+          end
+          @context = context
+        end
+
+        def in_context(context)
+          @context = context
+          self
+        end
+
+        def matches?(controller)
+          @controller = controller
+          redirects_to_url?
+        end
+
+        attr_reader :failure_message, :negative_failure_message
+
+        def description
+          "redirect to #{@location}"
+        end
+
+        private
+
+        def redirects_to_url?
+          @url = @context.instance_eval(&@url_block) if @url_block
+          begin
+            @context.send(:assert_redirected_to, @url)
+            @negative_failure_message = "Didn't expect to redirect to #{@url}"
+            true
+          rescue Test::Unit::AssertionFailedError => error
+            @failure_message = error.message
+            false
+          end
+        end
+
+      end
+
+    end
+  end
+end

test/matchers/controller/redirect_to_matcher_test.rb

@@ -0,0 +1,37 @@
+require File.join(File.dirname(__FILE__), '..', '..', 'test_helper')
+
+class RedirectToMatcherTest < ActionController::TestCase # :nodoc:
+
+  context "a controller that redirects" do
+    setup do
+      @controller = build_response { redirect_to '/some/url' }
+    end
+
+    should "accept redirecting to that url" do
+      assert_accepts redirect_to('/some/url'), @controller
+    end
+
+    should "reject redirecting to a different url" do
+      assert_rejects redirect_to('/some/other/url'), @controller
+    end
+
+    should "accept redirecting to that url in a block" do
+      assert_accepts redirect_to('somewhere') { '/some/url' }, @controller
+    end
+
+    should "reject redirecting to a different url in a block" do
+      assert_rejects redirect_to('somewhere else') { '/some/other/url' }, @controller
+    end
+  end
+
+  context "a  controller that doesn't redirect" do
+    setup do
+      @controller = build_response { render :text => 'hello' }
+    end
+
+    should "reject redirecting to a url" do
+      assert_rejects redirect_to('/some/url'), @controller
+    end
+  end
+
+end