Manually update menu items in header as of 2019/04/30:
Manually update menu items in header as of 2019/04/30:

cf. rails/guides/source/layout.html.erb - rails/rails
https://github.com/rails/rails/blob/83f7c25dfc441945dfc9eaab7e7880da24d3c026/guides/source/testing.md

yasslab/railsguides.jp,yasslab/railsguides.jp,yasslab/railsguides.jp,yasslab/railsguides.jp