1 files changed, 24 insertions, 0 deletions
diff --git a/spec/migrations/complete_namespace_settings_migration_spec.rb b/spec/migrations/complete_namespace_settings_migration_spec.rb
new file mode 100644
index 00000000000..7820536f355
--- /dev/null
+++ b/spec/migrations/complete_namespace_settings_migration_spec.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20200907124300_complete_namespace_settings_migration.rb')
+
+RSpec.describe CompleteNamespaceSettingsMigration, :redis do
+  let(:migration) { spy('migration') }
+
+  context 'when still legacy artifacts exist' do
+    let(:namespaces) { table(:namespaces) }
+    let(:namespace_settings) { table(:namespace_settings) }
+    let!(:namespace) { namespaces.create!(name: 'gitlab', path: 'gitlab-org') }
+
+    it 'steals sidekiq jobs from BackfillNamespaceSettings background migration' do
+      expect(Gitlab::BackgroundMigration).to receive(:steal).with('BackfillNamespaceSettings')
+
+      migrate!
+    end
+
+    it 'migrates namespaces without namespace_settings' do
+      expect { migrate! }.to change { namespace_settings.count }.from(0).to(1)
+    end
+  end
+end