Add have_http_link_header matcher and set header values as strings (#31010)

spec/requests/accounts_spec.rb

@@ -69,8 +69,7 @@ RSpec.describe 'Accounts show response' do
             expect(response)
               .to have_http_status(200)
               .and render_template(:show)
-
-            expect(response.headers['Link'].to_s).to include ActivityPub::TagManager.instance.uri_for(account)
+              .and have_http_link_header(ActivityPub::TagManager.instance.uri_for(account)).for(rel: 'alternate')
           end
         end
 

spec/requests/api/v1/timelines/home_spec.rb

@@ -94,8 +94,9 @@ RSpec.describe 'Home', :inline_jobs do
       it 'returns http unprocessable entity', :aggregate_failures do
         subject
 
-        expect(response).to have_http_status(422)
-        expect(response.headers['Link']).to be_nil
+        expect(response)
+          .to have_http_status(422)
+          .and not_have_http_link_header
       end
     end
   end

spec/requests/api/v1/timelines/list_spec.rb

@@ -47,8 +47,9 @@ RSpec.describe 'API V1 Timelines List' do
       it 'returns http unprocessable entity' do
         get "/api/v1/timelines/list/#{list.id}", headers: headers
 
-        expect(response).to have_http_status(422)
-        expect(response.headers['Link']).to be_nil
+        expect(response)
+          .to have_http_status(422)
+          .and not_have_http_link_header
       end
     end
   end

spec/requests/link_headers_spec.rb

@@ -6,28 +6,12 @@ RSpec.describe 'Link headers' do
   describe 'on the account show page' do
     let(:account) { Fabricate(:account, username: 'test') }
 
-    before do
+    it 'contains webfinger and activitypub urls in link header' do
       get short_account_path(username: account)
-    end
 
-    it 'contains webfinger url in link header' do
-      link_header = link_header_with_type('application/jrd+json')
-
-      expect(link_header.href).to eq 'https://cb6e6126.ngrok.io/.well-known/webfinger?resource=acct%3Atest%40cb6e6126.ngrok.io'
-      expect(link_header.attr_pairs.first).to eq %w(rel lrdd)
-    end
-
-    it 'contains activitypub url in link header' do
-      link_header = link_header_with_type('application/activity+json')
-
-      expect(link_header.href).to eq 'https://cb6e6126.ngrok.io/users/test'
-      expect(link_header.attr_pairs.first).to eq %w(rel alternate)
-    end
-
-    def link_header_with_type(type)
-      LinkHeader.parse(response.headers['Link'].to_s).links.find do |link|
-        link.attr_pairs.any?(['type', type])
-      end
+      expect(response)
+        .to have_http_link_header('https://cb6e6126.ngrok.io/.well-known/webfinger?resource=acct%3Atest%40cb6e6126.ngrok.io').for(rel: 'lrdd', type: 'application/jrd+json')
+        .and have_http_link_header('https://cb6e6126.ngrok.io/users/test').for(rel: 'alternate', type: 'application/activity+json')
     end
   end
 end