Move registration of new exampel group to listener provided by Runner

module (reducing dependency from Spec::Example to Spec::Runner).

lib/spec/example/example_group_methods.rb

@@ -2,23 +2,23 @@ module Spec
   module Example
 
     module ExampleGroupMethods
-      include Spec::Example::BeforeAndAfterHooks
-
-      def self.matcher_class
-        @matcher_class
-      end
-
-      def self.matcher_class=(matcher_class)
-        @matcher_class = matcher_class
-      end
+      class << self
+        attr_accessor :matcher_class
 
-      def self.description_text(*args)
-        args.inject("") do |description, arg|
-          description << " " unless (description == "" || arg.to_s =~ /^(\s|\.|#)/)
-          description << arg.to_s
+        def description_text(*args)
+          args.inject("") do |description, arg|
+            description << " " unless (description == "" || arg.to_s =~ /^(\s|\.|#)/)
+            description << arg.to_s
+          end
+        end
+
+        def example_group_creation_listeners
+          @example_group_creation_listeners ||= []
         end
       end
 
+      include Spec::Example::BeforeAndAfterHooks
+
       attr_reader :description_options, :spec_path
       alias :options :description_options
 
@@ -42,8 +42,13 @@ def description_args
 
       def inherited(klass)
         super
-        Spec::Runner.options.add_example_group klass
-        Spec::Runner.register_at_exit_hook
+        register_example_group(klass)
+      end
+
+      def register_example_group(klass)
+        ExampleGroupMethods.example_group_creation_listeners.each do |l|
+          l.register_example_group(klass)
+        end
       end
 
       # Makes the describe/it syntax available from a class. For example:

lib/spec/runner.rb

@@ -10,6 +10,16 @@
 
 module Spec
   module Runner
+
+    class ExampleGroupCreationListener
+      def register_example_group(klass)
+        Spec::Runner.options.add_example_group klass
+        Spec::Runner.register_at_exit_hook
+      end
+    end
+
+    Spec::Example::ExampleGroupMethods.example_group_creation_listeners << ExampleGroupCreationListener.new
+
     class << self
       def configuration # :nodoc:
         @configuration ||= Spec::Example::Configuration.new