Explicitly test that guest is able to search through the wiki

app/helpers/search_helper.rb

@@ -33,6 +33,12 @@ module SearchHelper
   def parse_search_result(result)
     Gitlab::ProjectSearchResults.parse_search_result(result)
   end
+  
+  def show_notes_tab?
+    [:read_merge_request, :download_code, :read_issue, :read_project_snippet].all? do |ability|
+      can?(current_user, :read_merge_request, @project)
+    end
+  end
   private

app/views/search/_category.html.haml

@@ -27,7 +27,7 @@
             Milestones
             %span.badge
               = @search_results.milestones_count
-      - if can?(current_user, :read_merge_request, @project) || can?(current_user, :read_issue, @project)
+      - if show_notes_tab?
         %li{ class: active_when(@scope == 'notes') }
           = link_to search_filter_path(scope: 'notes') do
             Comments

spec/lib/gitlab/project_search_results_spec.rb

@@ -123,8 +123,8 @@ describe Gitlab::ProjectSearchResults, lib: true do
     context 'when wiki is internal' do
       let(:project) { create(:project, :public, :wiki_private) }
-      it 'finds wiki blobs for members' do
-        project.add_reporter(user)
+      it 'finds wiki blobs for guest' do
+        project.add_guest(user)
         is_expected.not_to be_empty
       end

spec/services/search_service_spec.rb

@@ -29,7 +29,7 @@ describe SearchService, services: true do
       it 'returns the project for guests' do
         search_project = create :empty_project
-        search_project.team << [user, :guest]
+        search_project.add_guest(user)
         project = SearchService.new(user, project_id: search_project.id).project