Fix callback matchers to take controller instances

Controller matchers operate on instances of controllers, not controller
classes themselves.

lib/shoulda/matchers/action_controller/callback_matcher.rb

@@ -68,18 +68,20 @@ module Shoulda # :nodoc:
           @callback_type = callback_type
         end
 
-        def matches?(subject)
-          @subject = subject
+        def matches?(controller)
+          @controller = controller
+          @controller_class = controller.class
+
           callbacks.map(&:filter).include?(method_name)
         end
 
         def failure_message
-          "Expected that #{subject.name} would have :#{method_name} as a #{kind}_#{callback_type}"
+          "Expected that #{controller_class.name} would have :#{method_name} as a #{kind}_#{callback_type}"
         end
         alias failure_message_for_should failure_message
 
         def failure_message_when_negated
-          "Expected that #{subject.name} would not have :#{method_name} as a #{kind}_#{callback_type}"
+          "Expected that #{controller_class.name} would not have :#{method_name} as a #{kind}_#{callback_type}"
         end
         alias failure_message_for_should_not failure_message_when_negated
 
@@ -90,10 +92,13 @@ module Shoulda # :nodoc:
         private
 
         def callbacks
-          subject._process_action_callbacks.select { |callback| callback.kind == kind }
+          controller_class._process_action_callbacks.select do |callback|
+            callback.kind == kind
+          end
         end
 
-        attr_reader :method_name, :subject, :kind, :callback_type
+        attr_reader :method_name, :controller, :controller_class, :kind,
+          :callback_type
       end
     end
   end

spec/shoulda/matchers/action_controller/callback_matcher_spec.rb

@@ -2,52 +2,55 @@ require 'spec_helper'
 
 describe Shoulda::Matchers::ActionController::CallbackMatcher do
   shared_examples 'CallbackMatcher' do |kind, callback_type|
-    let(:matcher) { described_class.new(:authenticate_user!, kind, callback_type) }
-    let(:controller) { define_controller('HookController') }
+    let(:kind) { kind }
+    let(:callback_type) { callback_type }
+    let(:method_name) { :authenticate_user! }
+    let(:matcher) { described_class.new(method_name, kind, callback_type) }
+    let(:controller) { define_controller('HookController').new }
 
-    describe '#matches?' do
-      it "matches when a #{kind} hook is in place" do
-        add_callback(kind, callback_type, :authenticate_user!)
+    def match
+      __send__("use_#{kind}_#{callback_type}", method_name)
+    end
 
-        expect(matcher.matches?(controller)).to be_true
-      end
+    it "matches when a #{kind} hook is in place" do
+      add_callback(kind, callback_type, method_name)
 
-      it "does not match when a #{kind} hook is missing" do
-        expect(matcher.matches?(controller)).to be_false
-      end
+      expect(controller).to match
+    end
+
+    it "does not match when a #{kind} hook is missing" do
+      expect(controller).not_to match
     end
 
     describe 'description' do
       it 'includes the filter kind and name' do
-        expect(matcher.description).to eq "have :authenticate_user! as a #{kind}_#{callback_type}"
+        expect(matcher.description).to eq "have #{method_name.inspect} as a #{kind}_#{callback_type}"
       end
     end
 
     describe 'failure message' do
       it 'includes the filter kind and name that was expected' do
-        message = "Expected that HookController would have :authenticate_user! as a #{kind}_#{callback_type}"
+        message = "Expected that HookController would have #{method_name.inspect} as a #{kind}_#{callback_type}"
 
         expect {
-          expect(controller).to send("use_#{kind}_#{callback_type}", :authenticate_user!)
+          expect(controller).to send("use_#{kind}_#{callback_type}", method_name)
         }.to fail_with_message(message)
       end
     end
 
     describe 'failure message when negated' do
       it 'includes the filter kind and name that was expected' do
-        add_callback(kind, callback_type, :authenticate_user!)
-        message = "Expected that HookController would not have :authenticate_user! as a #{kind}_#{callback_type}"
+        add_callback(kind, callback_type, method_name)
+        message = "Expected that HookController would not have #{method_name.inspect} as a #{kind}_#{callback_type}"
 
-        expect {
-          expect(controller).not_to send("use_#{kind}_#{callback_type}", :authenticate_user!)
-        }.to fail_with_message(message)
+        expect { expect(controller).not_to match }.to fail_with_message(message)
       end
     end
 
     private
 
     def add_callback(kind, callback_type, callback)
-      controller.send("#{kind}_#{callback_type}", callback)
+      controller.class.__send__("#{kind}_#{callback_type}", callback)
     end
   end