Implement #respond_to? in addition to #method_missing

[#1419 state:resolved]

lib/dm-validations/validation_errors.rb

@@ -109,6 +109,10 @@ def method_missing(meth, *args, &block)
         errors.send(meth, *args, &block)
       end
 
+      def respond_to?(method)
+        super || errors.respond_to?(method)
+      end
+
       def [](property_name)
         if property_errors = errors[property_name.to_sym]
           property_errors

spec/unit/validation_errors/respond_to_spec.rb

@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe 'DataMapper::Validations::ValidationErrors#respond_to?' do
+
+  subject { DataMapper::Validations::ValidationErrors.new(Object.new) }
+
+  it 'should look for the method in self' do
+    subject.should respond_to(:full_messages)
+  end
+
+  it 'should delegate lookup to the underlying errors hash' do
+    subject.should respond_to(:size)
+  end
+
+end
+