Add `failure_message_for_should_not` to `validate_numericality_of`

As well as to its submatchers:
* OnlyIntegerMatcher
* OddEvenNumberMatcher

NEWS.md

@@ -1,5 +1,8 @@
 # HEAD
 
+* Add missing `failure_message_for_should_not` implementations to
+`validate_numericality_of` and its submatchers
+
 * Support validation contexts for testing validations `on: :create` and when using custom contexts like `model.valid?(:my_context)`.
 
 * Fix a bug in validations with autosaved models.

lib/shoulda/matchers/active_model/odd_even_number_matcher.rb

@@ -37,7 +37,11 @@ module Shoulda # :nodoc:
         def failure_message_for_should
           @disallow_value_matcher.failure_message_for_should
         end
+
+        def failure_message_for_should_not
+          @disallow_value_matcher.failure_message_for_should_not
+        end
       end
     end
   end
-end
+end

lib/shoulda/matchers/active_model/only_integer_matcher.rb

@@ -27,6 +27,10 @@ module Shoulda # :nodoc:
         def failure_message_for_should
           @disallow_value_matcher.failure_message_for_should
         end
+
+        def failure_message_for_should_not
+          @disallow_value_matcher.failure_message_for_should_not
+        end
       end
     end
   end

lib/shoulda/matchers/active_model/validate_numericality_of_matcher.rb

@@ -64,7 +64,11 @@ module Shoulda # :nodoc:
         end
 
         def failure_message_for_should
-          submatcher_failure_messages.last
+          submatcher_failure_messages_for_should.last
+        end
+
+        def failure_message_for_should_not
+          submatcher_failure_messages_for_should_not.last
         end
 
         private
@@ -85,10 +89,14 @@ module Shoulda # :nodoc:
           failing_submatchers.empty?
         end
 
-        def submatcher_failure_messages
+        def submatcher_failure_messages_for_should
           failing_submatchers.map(&:failure_message_for_should)
         end
 
+        def submatcher_failure_messages_for_should_not
+          failing_submatchers.map(&:failure_message_for_should_not)
+        end
+
         def failing_submatchers
           @failing_submatchers ||= @submatchers.select { |matcher| !matcher.matches?(@subject) }
         end

spec/shoulda/matchers/active_model/validate_numericality_of_matcher_spec.rb

@@ -22,6 +22,14 @@ describe Shoulda::Matchers::ActiveModel::ValidateNumericalityOfMatcher do
       define_model(:example, :attr => :string).new.should_not matcher
     end
 
+    it 'rejects with the ActiveRecord :not_a_number message' do
+      the_matcher = matcher
+
+      the_matcher.matches?(define_model(:example, :attr => :string).new)
+
+      the_matcher.failure_message_for_should_not.should include 'Did not expect errors to include "is not a number"'
+    end
+
     it 'rejects with the ActiveRecord :not_an_integer message' do
       the_matcher = matcher.only_integer