use Gitlab::Favicon for jira service

app/models/project_services/jira_service.rb

@@ -265,7 +265,7 @@ class JiraService < IssueTrackerService
         title: title,
         status: status,
         icon: {
-          title: 'GitLab', url16x16: asset_url('favicon.png', host: gitlab_config.url)
+          title: 'GitLab', url16x16: asset_url(Gitlab::Favicon.main, host: gitlab_config.url)
         }
       }
     }

spec/models/project_services/jira_service_spec.rb

@@ -164,6 +164,8 @@ describe JiraService do
     it "creates Remote Link reference in JIRA for comment" do
       @jira_service.close_issue(merge_request, ExternalIssue.new("JIRA-123", project))
 
+      favicon_path = "http://localhost/assets/#{Rails.application.assets.find_asset('favicon.png').digest_path}"
+
       # Creates comment
       expect(WebMock).to have_requested(:post, @comment_url)
       # Creates Remote Link in JIRA issue fields
@@ -173,7 +175,7 @@ describe JiraService do
           object: {
             url: "#{Gitlab.config.gitlab.url}/#{project.full_path}/commit/#{merge_request.diff_head_sha}",
             title: "GitLab: Solved by commit #{merge_request.diff_head_sha}.",
-            icon: { title: "GitLab", url16x16: "http://localhost/favicon.png" },
+            icon: { title: "GitLab", url16x16: favicon_path },
             status: { resolved: true }
           }
         )
@@ -464,4 +466,18 @@ describe JiraService do
       end
     end
   end
+
+  describe 'favicon urls', :request_store do
+    it 'includes the standard favicon' do
+      props = described_class.new.send(:build_remote_link_props, url: 'http://example.com', title: 'title')
+      expect(props[:object][:icon][:url16x16]).to match %r{^http://localhost/assets/favicon(?:-\h+).png$}
+    end
+
+    it 'includes returns the custom favicon' do
+      create :appearance, favicon: fixture_file_upload(Rails.root.join('spec/fixtures/dk.png'))
+
+      props = described_class.new.send(:build_remote_link_props, url: 'http://example.com', title: 'title')
+      expect(props[:object][:icon][:url16x16]).to match %r{^http://localhost/uploads/-/system/appearance/favicon/\d+/favicon_main_dk.png$}
+    end
+  end
 end

spec/services/system_note_service_spec.rb

@@ -769,6 +769,8 @@ describe SystemNoteService do
     end
 
     describe "new reference" do
+      let(:favicon_path) { "http://localhost/assets/#{Rails.application.assets.find_asset('favicon.png').digest_path}" }
+
       before do
         allow(JIRA::Resource::Remotelink).to receive(:all).and_return([])
       end
@@ -789,7 +791,7 @@ describe SystemNoteService do
               object: {
                 url: project_commit_url(project, commit),
                 title: "GitLab: Mentioned on commit - #{commit.title}",
-                icon: { title: "GitLab", url16x16: "http://localhost/favicon.png" },
+                icon: { title: "GitLab", url16x16: favicon_path },
                 status: { resolved: false }
               }
             )
@@ -815,7 +817,7 @@ describe SystemNoteService do
               object: {
                 url: project_issue_url(project, issue),
                 title: "GitLab: Mentioned on issue - #{issue.title}",
-                icon: { title: "GitLab", url16x16: "http://localhost/favicon.png" },
+                icon: { title: "GitLab", url16x16: favicon_path },
                 status: { resolved: false }
               }
             )
@@ -841,7 +843,7 @@ describe SystemNoteService do
               object: {
                 url: project_snippet_url(project, snippet),
                 title: "GitLab: Mentioned on snippet - #{snippet.title}",
-                icon: { title: "GitLab", url16x16: "http://localhost/favicon.png" },
+                icon: { title: "GitLab", url16x16: favicon_path },
                 status: { resolved: false }
               }
             )