FactoryBotの定義漏れ、不正な定義をテストする

factory_bot_spec.rb

# frozen_string_literal: true

RSpec.describe FactoryBot do
  shared_examples_for 'valid definition' do
    it 'is valid' do
      is_expected.to be_valid, (-> { factory.errors.full_messages.join("\n") })
    end
  end

  FactoryBot.factories.map(&:name).each do |factory_name|
    describe "factory :#{factory_name}" do
      subject(:factory) { FactoryBot.build(factory_name, *options) }
      let(:options) { [] }

      it_behaves_like 'valid definition'

      # Test each trait
      FactoryBot.factories[factory_name].definition.defined_traits.map(&:name).each do |trait_name|
        context "with trait :#{trait_name}" do
          let(:options) { [trait_name] }
          it_behaves_like 'valid definition'
        end
      end
    end
  end

  describe 'Definitions' do
    def factory_defined?(name)
      FactoryBot.factories[name]
      true
    rescue ArgumentError, KeyError
      false
    end

    it 'completes definitions' do
      table_names = ApplicationRecord.connection.tables

      missing_factories = table_names.reject do |table_name|
        factory_name = table_name.to_s.singularize.to_sym
        factory_defined?(factory_name)
      end

      expect(missing_factories).to be_empty, -> { "Missing factory definition. #{missing_factories.map(&:to_sym)}" }
    end
  end
end