zammad/spec/factories/user_device.rb

FactoryBot.define do
  factory :user_device do
    user_id                { 1 }
    name                   { 'test 1' }
    location               { 'some location' }
    user_agent             { 'some user agent' }
    ip                     { '127.0.0.1' }
    sequence(:fingerprint) { |n| "fingerprint#{n}" }
  end
end