Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/singleton/fixtures/classes.rb

@@ -0,0 +1,18 @@
+require 'singleton'
+
+module SingletonSpecs
+  class MyClass
+    attr_accessor :data
+    include Singleton
+  end
+
+  class NewSpec
+    include Singleton
+  end
+
+  class MyClassChild < MyClass
+  end
+
+  class NotInstantiated < MyClass
+  end
+end