Add spec for reason phrase

spec/response_spec.rb

@@ -200,7 +200,7 @@
  end
 
  describe 'response unboxing' do
- subject { described_class.new(status: 200, response_headers: {}, body: 'Hi!') }
+ subject { described_class.new(status: 200, response_headers: {}, body: 'Hi!', reason_phrase: 'Success') }
 
  let(:env) { { method: :get } }
  let(:response) { subject.to_response(env) }
@@ -224,6 +224,10 @@
  it 'merges the body' do
  expect(response.body).to eq('Hi!')
  end
+
+ it 'merges the reason phrase' do
+ expect(response.reason_phrase).to eq('Success')
+ end
  end
 
  describe 'remove age before caching and normalize max-age if non-zero age present' do