shared_examples_spec.rb

RSpec.shared_examples Enumerator do |enum|
  describe '#each', 'without block' do 
     subject { enum.each }

     it 'returns Enumeretator' do 
       is_expected.to be_kind_of(Enumerator)
     end
  end
end

it_behaves_like Enumerator, [1, 2, 3]
it_behaves_like Enumerator, {h: 1, b: 2} do
  it { is_expected.to respond_to(:has_key?) }
end