1 files changed, 60 insertions, 0 deletions
diff --git a/spec/migrations/schedule_calculate_wiki_sizes_spec.rb b/spec/migrations/schedule_calculate_wiki_sizes_spec.rb
new file mode 100644
index 00000000000..39a93f3ed25
--- /dev/null
+++ b/spec/migrations/schedule_calculate_wiki_sizes_spec.rb
@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20190527194900_schedule_calculate_wiki_sizes.rb')
+
+RSpec.describe ScheduleCalculateWikiSizes do
+  let(:migration_class) { Gitlab::BackgroundMigration::CalculateWikiSizes }
+  let(:migration_name)  { migration_class.to_s.demodulize }
+
+  let(:namespaces) { table(:namespaces) }
+  let(:projects) { table(:projects) }
+  let(:project_statistics) { table(:project_statistics) }
+  let(:namespace) { namespaces.create!(name: 'wiki-migration', path: 'wiki-migration') }
+  let(:project1) { projects.create!(name: 'wiki-project-1', path: 'wiki-project-1', namespace_id: namespace.id) }
+  let(:project2) { projects.create!(name: 'wiki-project-2', path: 'wiki-project-2', namespace_id: namespace.id) }
+  let(:project3) { projects.create!(name: 'wiki-project-3', path: 'wiki-project-3', namespace_id: namespace.id) }
+
+  context 'when missing wiki sizes exist' do
+    let!(:project_statistic1) { project_statistics.create!(id: 1, project_id: project1.id, namespace_id: namespace.id, wiki_size: 1000) }
+    let!(:project_statistic2) { project_statistics.create!(id: 2, project_id: project2.id, namespace_id: namespace.id, wiki_size: nil) }
+    let!(:project_statistic3) { project_statistics.create!(id: 3, project_id: project3.id, namespace_id: namespace.id, wiki_size: nil) }
+
+    it 'schedules a background migration' do
+      Timecop.freeze do
+        migrate!
+
+        expect(migration_name).to be_scheduled_delayed_migration(5.minutes, project_statistic2.id, project_statistic3.id)
+        expect(BackgroundMigrationWorker.jobs.size).to eq 1
+      end
+    end
+
+    it 'calculates missing wiki sizes', :sidekiq_inline do
+      expect(project_statistic2.wiki_size).to be_nil
+      expect(project_statistic3.wiki_size).to be_nil
+
+      migrate!
+
+      expect(project_statistic2.reload.wiki_size).not_to be_nil
+      expect(project_statistic3.reload.wiki_size).not_to be_nil
+    end
+  end
+
+  context 'when missing wiki sizes do not exist' do
+    before do
+      namespace = namespaces.create!(name: 'wiki-migration', path: 'wiki-migration')
+      project = projects.create!(name: 'wiki-project-1', path: 'wiki-project-1', namespace_id: namespace.id)
+      project_statistics.create!(project_id: project.id, namespace_id: 1, wiki_size: 1000)
+    end
+
+    it 'does not schedule a background migration' do
+      Sidekiq::Testing.fake! do
+        Timecop.freeze do
+          migrate!
+
+          expect(BackgroundMigrationWorker.jobs.size).to eq 0
+        end
+      end
+    end
+  end
+end