This plugin is checking the password expiration.
The password expiration limit is 3 months.
Clone into the plugins directory.
$ cd /path/to/your/redmine
$ git clone git@github.com:taise/redmine_passwd_checkers.git plugins/redmine_passwd_checkers
$ bundle install
$ bundle exec rake redmine:plugins:migrate
$ cd /path/to/your/redmine
$ bundle install
$ bundle exec rails generate rspec:install
$ bundle exec rake redmine:plugins:migrate
$ bundle exec rspec plugin/redmine_passwd_checkers/spec