Added should observe. Patch by Luke Melia.

CHANGELOG

@@ -4,5 +4,6 @@ Change Log
 Trunk
 -----
 
+* 2008/03/02 - Added should observe (Luke Melia)
 * 2008/03/02 - Patched validates_length_of to use within to be consistent with Rails (Matt Pelletier)
 * 2007/01/03 - Initial Public Release

README

@@ -51,6 +51,11 @@ Adds the following RSpec matchers:
     object.should validate_length_of(:attribute, :is => 5)
     TM snippet: [msvl + tab]
 
+  * Observers:
+    Verify that the observer is observing a class. (doesn't verify that the observation works)
+
+    object.should observe(:model)
+    example: GroupObserver.should observe(Group)
 
   * Views:
     Verifies that the views contains some tags.
@@ -173,6 +178,8 @@ Core Contributors
 Contributors
 -------------
 
-  * ckknight (improved should validate_length_of)
+  * ckknight
+  * Matt Pelletier
+  * Luke Melia
 
 Copyright (c) 2008 The Plugin Development Team, released under the MIT license

init.rb

@@ -1,3 +1,5 @@
+require 'spec/rails/matchers/observers'
 require 'spec/rails/matchers/associations'
 require 'spec/rails/matchers/validations'
-require 'spec/rails/matchers/views'
+require 'spec/rails/matchers/views'
+require 'spec/rails/matchers/observers'

lib/spec/rails/matchers/observers.rb

@@ -0,0 +1,34 @@
+module Spec
+  module Rails
+    module Matchers
+
+      class Observe
+        def initialize(expected_model_class)
+          @expected_model_class = expected_model_class
+        end
+
+        def matches?(observer)
+          @observer = observer
+          if @observer.is_a?(ActiveRecord::Observer)
+            @observer = @observer.class
+          end
+          @observed_classes = observer.observed_classes.flatten
+          @observed_classes.include?(@expected_model_class)
+        end
+
+        def failure_message
+          return "expected #{@observer.name} to observe #{@expected_model_class.name}, but it was not included in [#{@observed_classes.map(&:name).join(', ')}]"
+        end
+
+        def description
+          "observer to be observing #{@expected_model_class.name}"
+        end
+      end
+
+      def observe(expected_model_class)
+        Observe.new(expected_model_class)
+      end
+
+    end
+  end
+end