added commits and merge request diffs to export

app/services/projects/import_export.rb

@@ -11,13 +11,21 @@ module Projects
     end
 
     def project_tree
-      %i(issues merge_requests labels milestones snippets releases events commit_statuses) + members
+      %i(issues labels milestones snippets releases events) + [members, merge_requests, commit_statuses]
     end
 
     private
 
+    def merge_requests
+      { merge_requests: { include: :merge_request_diff } }
+    end
+
+    def commit_statuses
+      { commit_statuses: { include: :commit } }
+    end
+
     def members
-      [{ project_members: { include: [user: { only: [:id, :email, :username] }] } }]
+      { project_members: { include: [user: { only: [:id, :email, :username] }] } }
     end
 
     def storage_path

spec/services/projects/import_export/project_tree_saver_spec.rb

@@ -85,6 +85,14 @@ describe Projects::ImportExport::ProjectTreeSaver, services: true do
       it 'has project members' do
         expect(saved_project_json['project_members']).not_to be_empty
       end
+
+      it 'has merge requests diffs' do
+        expect(saved_project_json['merge_requests'].first['merge_request_diff']).not_to be_empty
+      end
+
+      it 'has ci commits' do
+        expect(saved_project_json['commit_statuses'].first['commit']).not_to be_empty
+      end
     end
   end