ensl.org/spec/factories/message.rb

FactoryBot.define do
  factory :message do
    association :sender, factory: :user
    association :recipient, factory: :user
    sequence(:text)         { |n| "text-#{n}" }
    sequence(:title)        { |n| "title-#{n}" }
    sequence(:text_parsed)  { |n| "text-#{n}" }
  end
end