Validations fields Devise on Ruby on Rails with Rspec and Shoulda Matchers

devise_model_shared_example.rb

# spec/support/shared_examples/models/devise_model_shared_example.rb

name_shared_example = 'devise_model_shared_example'

RSpec.shared_examples name_shared_example do
  describe name_shared_example do
    describe "fields" do
      context "Database authenticatable" do
        it { should have_db_column(:email).of_type(:string).with_options(null: false, default: '') }
        it { should have_db_column(:encrypted_password).of_type(:string).with_options(null: false, default: '') }
      end

      context "Recoverable" do
        it { should have_db_column(:reset_password_token).of_type(:string) }
        it { should have_db_column(:reset_password_sent_at).of_type(:datetime) }
      end

      context "Rememberable" do
        it { should have_db_column(:remember_created_at).of_type(:datetime) }
      end

      context "Trackable" do
        it { should have_db_column(:sign_in_count).of_type(:integer).with_options(null: false, default: 0) }
        it { should have_db_column(:current_sign_in_at).of_type(:datetime) }
        it { should have_db_column(:last_sign_in_at).of_type(:datetime) }
        it { should have_db_column(:current_sign_in_ip).of_type(:string) }
        it { should have_db_column(:last_sign_in_ip).of_type(:string) }
      end

      context "Confirmable" do
        it { should have_db_column(:confirmation_token).of_type(:string) }
        it { should have_db_column(:confirmed_at).of_type(:datetime) }
        it { should have_db_column(:confirmation_sent_at).of_type(:datetime) }
        it { should have_db_column(:unconfirmed_email).of_type(:string) }
      end

      context "Lockable" do
        it { should have_db_column(:failed_attempts).of_type(:integer).with_options(null: false, default: 0) }
        it { should have_db_column(:unlock_token).of_type(:string) }
        it { should have_db_column(:locked_at).of_type(:datetime) }
      end

      context "Rails standard" do
        it { should have_db_column(:id).of_type(:integer).with_options(null: false) }
        it { should have_db_column(:created_at).of_type(:datetime).with_options(null: false) }
        it { should have_db_column(:updated_at).of_type(:datetime).with_options(null: false) }
      end
    end
  end
end

Gemfile

...
  
group :test do
  gem 'rspec-rails'
  gem 'shoulda-matchers'
end

...

spec_helper.rb

# spec/spec_helper.rb

...

# Config Shoulda Matchers
Shoulda::Matchers.configure do |config|
  config.integrate do |with|
    with.test_framework :rspec
    with.library :rails
  end
end

# Shared examples and Shared context
# read more:
# - https://relishapp.com/rspec/rspec-core/docs/example-groups/shared-examples
# - https://cassidy.codes/blog/2019-09-28-rspec-shared-examples-contexts/
Dir["./spec/support/**/*.rb"].sort.each { |f| require f }

...

user_spec.rb

# spec/models/user_spec.rb

require 'rails_helper'

RSpec.describe User, type: :model do
  include_examples "devise_model_shared_example"
end