Add a spec for a case then protected method called from public_send in own method
Add a spec for a case then protected method called from public_send in own method

* Add specs to call public_send via own public method
  ref: https://bugs.ruby-lang.org/issues/7499

ruby/rubyspec,kachick/rubyspec,kachick/rubyspec,ruby/spec,eregon/rubyspec,nobu/rubyspec,ruby/spec,sgarciac/spec,sgarciac/spec,nobu/rubyspec,ruby/rubyspec,eregon/rubyspec,kachick/rubyspec,nobu/rubyspec,eregon/rubyspec,sgarciac/spec,ruby/spec