Rspec Sequel expectations

RSpec.configure do |config|
  config.include RSpec::Matchers::Sequel
end

describe DB do 
  it { expect(DB).to have_enum('role_types').with_values(%w(admin manager user)) }
end

describe 'companies table' do
  let(:table) { :companies }

  it { expect(table).to have_primary_keys(:id, :city_id) }
  it { expect(table).to have_column(:name).of_type(String).not_null.with_default('') }

  it { expect(table).to have_unique_index_on(:email) }
  it { expect(table).to have_index_on([:password, :email]).named('companies_credentials') }

  it { expect(table).to refer_to(:city).from_fk(:city_id).to_pk(:id).on_update(:cascade).on_delete(:set_null) }
end