Add a with_message option to comparison matcher.

NEWS.md

@@ -1,4 +1,6 @@
 # HEAD
+* Fix a bug with the `validate_numericality_of` matcher that would not allow the
+  `with_message` option on certain submatchers.
 
 * Fix a regression with context-dependent validations in ActiveResource
 

lib/shoulda/matchers/active_model/comparison_matcher.rb

@@ -9,6 +9,7 @@ module Shoulda # :nodoc:
         def initialize(value, operator)
           @value = value
           @operator = operator
+          @message = nil
         end
 
         def for(attribute)
@@ -18,13 +19,17 @@ module Shoulda # :nodoc:
 
         def matches?(subject)
           @subject = subject
-          disallows_value_of(value_to_compare)
+          disallows_value_of(value_to_compare, @message)
         end
 
         def allowed_types
           'integer'
         end
 
+        def with_message(message)
+          @message = message
+        end
+
         private
 
         def value_to_compare

spec/shoulda/matchers/active_model/comparison_matcher_spec.rb

@@ -26,6 +26,13 @@ describe Shoulda::Matchers::ActiveModel::ComparisonMatcher do
     it { instance_without_validations.should_not matcher.is_equal_to(0) }
   end
 
+  context 'with_message' do
+    it 'verifies the message for the validation' do
+      instance = instance_with_validations(:equal_to => 0, :message => 'Must be zero')
+      instance.should matcher.is_equal_to(0).with_message('Must be zero')
+    end
+  end
+
   def instance_with_validations(options = {})
     define_model :example, :attr => :string do
       validates_numericality_of :attr, options