    # File lib/chef/provider/user.rb, line 91
          def define_resource_requirements
            requirements.assert(:all_actions) do |a|
              a.assertion { @group_name_resolved }
              a.failure_message Chef::Exceptions::User, "Couldn't lookup integer GID for group name #{@new_resource.gid}"
              a.whyrun "group name #{@new_resource.gid} does not exist.  This will cause group assignment to fail.  Assuming this group will have been created previously."
            end
            requirements.assert(:all_actions) do |a|
              a.assertion { @shadow_lib_ok }
              a.failure_message Chef::Exceptions::MissingLibrary, "You must have ruby-shadow installed for password support!"
              a.whyrun "ruby-shadow is not installed. Attempts to set user password will cause failure.  Assuming that this gem will have been previously installed." +
                       "Note that user update converge may report false-positive on the basis of mismatched password. "
            end
            requirements.assert(:modify, :lock, :unlock) do |a|
              a.assertion { @user_exists }
              a.failure_message(Chef::Exceptions::User, "Cannot modify user #{@new_resource} - does not exist!")
              a.whyrun("Assuming user #{@new_resource} would have been created")
            end
          end