1 files changed, 67 insertions, 0 deletions
diff --git a/spec/migrations/cleanup_stages_position_migration_spec.rb b/spec/migrations/cleanup_stages_position_migration_spec.rb
new file mode 100644
index 00000000000..dde5a777487
--- /dev/null
+++ b/spec/migrations/cleanup_stages_position_migration_spec.rb
@@ -0,0 +1,67 @@
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180604123514_cleanup_stages_position_migration.rb')
+
+describe CleanupStagesPositionMigration, :migration, :sidekiq, :redis do
+  let(:migration) { spy('migration') }
+
+  before do
+    allow(Gitlab::BackgroundMigration::MigrateStageIndex)
+      .to receive(:new).and_return(migration)
+  end
+
+  context 'when there are pending background migrations' do
+    it 'processes pending jobs synchronously' do
+      Sidekiq::Testing.disable! do
+        BackgroundMigrationWorker
+          .perform_in(2.minutes, 'MigrateStageIndex', [1, 1])
+        BackgroundMigrationWorker
+          .perform_async('MigrateStageIndex', [1, 1])
+
+        migrate!
+
+        expect(migration).to have_received(:perform).with(1, 1).twice
+      end
+    end
+  end
+
+  context 'when there are no background migrations pending' do
+    it 'does nothing' do
+      Sidekiq::Testing.disable! do
+        migrate!
+
+        expect(migration).not_to have_received(:perform)
+      end
+    end
+  end
+
+  context 'when there are still unmigrated stages present' do
+    let(:stages) { table('ci_stages') }
+    let(:builds) { table('ci_builds') }
+
+    let!(:entities) do
+      %w[build test broken].map do |name|
+        stages.create(name: name)
+      end
+    end
+
+    before do
+      stages.update_all(position: nil)
+
+      builds.create(name: 'unit', stage_id: entities.first.id, stage_idx: 1, ref: 'master')
+      builds.create(name: 'unit', stage_id: entities.second.id, stage_idx: 1, ref: 'master')
+    end
+
+    it 'migrates stages sequentially for every stage' do
+      expect(stages.all).to all(have_attributes(position: nil))
+
+      migrate!
+
+      expect(migration).to have_received(:perform)
+        .with(entities.first.id, entities.first.id)
+      expect(migration).to have_received(:perform)
+        .with(entities.second.id, entities.second.id)
+      expect(migration).not_to have_received(:perform)
+        .with(entities.third.id, entities.third.id)
+    end
+  end
+end