Test for https://github.com/jeremyevans/roda/issues/384

test_mailer.rb

require 'roda'

class Mailer < Roda

  plugin :mailer

  route do |r|
    r.mail 'current_welcome' do |user_id, mail_from|
      <<~BODY
        user_id: #{user_id.inspect}
        mail_from: #{mail_from.inspect}
      BODY
    end

    r.mail 'proposed_welcome', Integer do |user_id, mail_from|
      <<~BODY
        user_id: #{user_id.inspect}
        mail_from: #{mail_from.inspect}
      BODY
    end
  end
end

puts "current"
puts Mailer.mail('/current_welcome/2', '[email protected]').body
puts

puts "proposed"
puts Mailer.mail('/proposed_welcome/2', '[email protected]').body

Output:

current
user_id: "[email protected]"
mail_from: nil

proposed
user_id: 2
mail_from: "[email protected]"