Revert "Temporarily remove MR diffs removal migration"

This reverts commit 15ec6a13eb4d839d252315bf5b0a50d28351cb5f.

1 files changed, 48 insertions, 0 deletions

diff --git a/spec/migrations/enqueue_delete_diff_files_workers_spec.rb b/spec/migrations/enqueue_delete_diff_files_workers_spec.rb
new file mode 100644
index 00000000000..686027822b8
--- /dev/null
+++ b/spec/migrations/enqueue_delete_diff_files_workers_spec.rb
@@ -0,0 +1,48 @@
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180619121030_enqueue_delete_diff_files_workers.rb')
+
+describe EnqueueDeleteDiffFilesWorkers, :migration, :sidekiq do
+  let(:merge_request_diffs) { table(:merge_request_diffs) }
+  let(:merge_requests) { table(:merge_requests) }
+  let(:namespaces) { table(:namespaces) }
+  let(:projects) { table(:projects) }
+
+  before do
+    stub_const("#{described_class.name}::BATCH_SIZE", 2)
+
+    namespaces.create!(id: 1, name: 'gitlab', path: 'gitlab')
+    projects.create!(id: 1, namespace_id: 1, name: 'gitlab', path: 'gitlab')
+
+    merge_requests.create!(id: 1, target_project_id: 1, source_project_id: 1, target_branch: 'feature', source_branch: 'master', state: 'merged')
+
+    merge_request_diffs.create!(id: 1, merge_request_id: 1, state: 'collected')
+    merge_request_diffs.create!(id: 2, merge_request_id: 1, state: 'without_files')
+    merge_request_diffs.create!(id: 3, merge_request_id: 1, state: 'collected')
+    merge_request_diffs.create!(id: 4, merge_request_id: 1, state: 'collected')
+    merge_request_diffs.create!(id: 5, merge_request_id: 1, state: 'empty')
+    merge_request_diffs.create!(id: 6, merge_request_id: 1, state: 'collected')
+
+    merge_requests.update(1, latest_merge_request_diff_id: 6)
+  end
+
+  it 'correctly schedules diff file deletion workers' do
+    Sidekiq::Testing.fake! do
+      Timecop.freeze do
+        migrate!
+
+        # 1st batch
+        expect(described_class::MIGRATION).to be_scheduled_delayed_migration(8.minutes, 1)
+        expect(described_class::MIGRATION).to be_scheduled_delayed_migration(9.minutes, 3)
+        # 2nd batch
+        expect(described_class::MIGRATION).to be_scheduled_delayed_migration(16.minutes, 4)
+        expect(described_class::MIGRATION).to be_scheduled_delayed_migration(17.minutes, 6)
+        expect(BackgroundMigrationWorker.jobs.size).to eq(4)
+      end
+    end
+  end
+
+  it 'migrates the data' do
+    expect { migrate! }.to change { merge_request_diffs.where(state: 'without_files').count }
+      .from(1).to(4)
+  end
+end