Add basic test for YARD::Handlers::WiresNamespaceHandler

--HG--
extra : amend_source : ec019eaa51ee19a63494f021297d0e4bf725da6f
Move YARD::Handlers::WiresNamespaceHandler to YARD::Handlers::Ruby::WiresNamespaceHandler

--HG--
rename : lib/yard/handlers/wires_namespace_handler.rb => lib/yard/handlers/ruby/wires_namespace_handler.rb