No need to include ActiveModel::Validations because ActiveModel::Model already includes it.

Author: tbsmatt

lib/value_objects/value.rb

@@ -4,7 +4,6 @@ module ValueObjects
   class Value
 
     include ::ActiveModel::Model
-    include ::ActiveModel::Validations
 
     def ==(other)
       self.class == other.class && self.class.attrs.all? { |key| public_send(key) == other.public_send(key) }

spec/value_objects/valid_validator_spec.rb

@@ -3,7 +3,6 @@
   class NilAllowedRecord
 
     include ActiveModel::Model
-    include ActiveModel::Validations
 
     attr_accessor :foo
 
@@ -14,7 +13,6 @@ class NilAllowedRecord
   class NilForbiddenRecord
 
     include ActiveModel::Model
-    include ActiveModel::Validations
 
     attr_accessor :foo