Uncovered mutation in virtus that can be a subject for a blog post about mutation testing.

mutation.diff

Subject: Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62
Alive: rspec:noop:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:3fa65 (0.23s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:6b800 (0.14s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:dcc9b (0.14s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:4834d (0.12s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:3f41d (0.12s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:3764e (0.12s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:f66a9 (0.14s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:6c517 (0.14s)
Killed: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:b41f5 (0.14s)
Alive: rspec:Virtus::Attribute.build:/home/mbj/devel/virtus/lib/virtus/attribute.rb:62:417c7 (0.15s)
@@ -1,6 +1,6 @@
 def self.build(name, type = Object,options = {})
   (attribute_class = determine_type(type) || raise(ArgumentError, "#{type.inspect} does not map to an attribute type"))
   attribute_options = attribute_class.merge_options(type, options)
-  attribute_class.new(name, attribute_options)
+  attribute_class.new(name)
 end
Kille