factory_girl

https://github.com/thoughtbot/factory_girl

Ruby

A library for setting up Ruby objects as test data.

FactoryBot::DefinitionProxy#sequence

Adds an attribute that will have unique values generated by a sequence with
a specified format.

The result of:
  factory :user do
    sequence(:email) { |n| "person#{n}@example.com" }
  end

Is equal to:
  sequence(:email) { |n| "person#{n}@example.com" }

  factory :user do
    email { FactoryBot.generate(:email) }
  end

Except that no globally available sequence will be defined.

Source | Google | Stack overflow

Edit

git clone [email protected]:thoughtbot/factory_girl.git
cd factory_girl
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-FactoryBot--DefinitionProxy-sequence-for-pr

# Commit to git

git add git commit -m "better docs for FactoryBot::DefinitionProxy#sequence"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-FactoryBot--DefinitionProxy-sequence-for-pr

hub pull-request

# Celebrate!