Fix "Wiki" link not appearing in navigation for projects with external wiki

CHANGELOG

@@ -50,6 +50,7 @@ v 8.11.3 (unreleased)
   - Allow system info page to handle case where info is unavailable
   - Label list shows all issues (opened or closed) with that label
   - Don't show resolve conflicts link before MR status is updated
+  - Fix "Wiki" link not appearing in navigation for projects with external wiki
   - Fix IE11 fork button bug !598
   - Don't prevent viewing the MR when git refs for conflicts can't be found on disk
   - Fix external issue tracker "Issues" link leading to 404s

app/models/project.rb

@@ -772,6 +772,10 @@ class Project < ActiveRecord::Base
     update_column(:has_external_issue_tracker, services.external_issue_trackers.any?)
   end
 
+  def has_wiki?
+    wiki_enabled? || has_external_wiki?
+  end
+
   def external_wiki
     if has_external_wiki.nil?
       cache_has_external_wiki # Populate

spec/models/project_spec.rb

@@ -516,6 +516,18 @@ describe Project, models: true do
     end
   end
 
+  describe '#has_wiki?' do
+    let(:no_wiki_project) { build(:project, wiki_enabled: false, has_external_wiki: false) }
+    let(:wiki_enabled_project) { build(:project, wiki_enabled: true) }
+    let(:external_wiki_project) { build(:project, has_external_wiki: true) }
+
+    it 'returns true if project is wiki enabled or has external wiki' do
+      expect(wiki_enabled_project).to have_wiki
+      expect(external_wiki_project).to have_wiki
+      expect(no_wiki_project).not_to have_wiki
+    end
+  end
+
   describe '#external_wiki' do
     let(:project) { create(:project) }