Support event filtering by wiki page status

Includes suggested changes from reviewer (@.luke)

Co-authored-by: @.luke

lib/event_filter.rb

@@ -9,6 +9,7 @@ class EventFilter
   ISSUE = 'issue'
   COMMENTS = 'comments'
   TEAM = 'team'
+  WIKI = 'wiki'
 
   def initialize(filter)
     # Split using comma to maintain backward compatibility Ex/ "filter1,filter2"
@@ -33,6 +34,8 @@ class EventFilter
       events.where(action: [Event::JOINED, Event::LEFT, Event::EXPIRED])
     when ISSUE
       events.where(action: [Event::CREATED, Event::UPDATED, Event::CLOSED, Event::REOPENED], target_type: 'Issue')
+    when WIKI
+      events.for_wiki_page
     else
       events
     end
@@ -42,7 +45,7 @@ class EventFilter
   private
 
   def filters
-    [ALL, PUSH, MERGED, ISSUE, COMMENTS, TEAM]
+    [ALL, PUSH, MERGED, ISSUE, COMMENTS, TEAM, WIKI]
   end
 end
 

spec/lib/event_filter_spec.rb

@@ -28,6 +28,8 @@ describe EventFilter do
     let_it_be(:comments_event) { create(:event, :commented, project: public_project, target: public_project) }
     let_it_be(:joined_event)   { create(:event, :joined,    project: public_project, target: public_project) }
     let_it_be(:left_event)     { create(:event, :left,      project: public_project, target: public_project) }
+    let_it_be(:wiki_page_event) { create(:wiki_page_event) }
+    let_it_be(:wiki_page_update_event) { create(:wiki_page_event, :updated) }
 
     let(:filtered_events) { described_class.new(filter).apply_filter(Event.all) }
 
@@ -79,6 +81,14 @@ describe EventFilter do
       end
     end
 
+    context 'with the "wiki" filter' do
+      let(:filter) { described_class::WIKI }
+
+      it 'returns only wiki page events' do
+        expect(filtered_events).to contain_exactly(wiki_page_event, wiki_page_update_event)
+      end
+    end
+
     context 'with an unknown filter' do
       let(:filter) { 'foo' }