1 files changed, 82 insertions, 0 deletions
diff --git a/spec/rubocop/cop/gitlab/event_store_subscriber_spec.rb b/spec/rubocop/cop/gitlab/event_store_subscriber_spec.rb
new file mode 100644
index 00000000000..e17fb71f9bc
--- /dev/null
+++ b/spec/rubocop/cop/gitlab/event_store_subscriber_spec.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+require 'fast_spec_helper'
+
+require_relative '../../../../rubocop/cop/gitlab/event_store_subscriber'
+
+RSpec.describe RuboCop::Cop::Gitlab::EventStoreSubscriber do
+  subject(:cop) { described_class.new }
+
+  context 'when an event store subscriber overrides #perform' do
+    it 'registers an offense' do
+      expect_offense(<<~WORKER)
+        class SomeWorker
+          include Gitlab::EventStore::Subscriber
+
+          def perform(*args)
+          ^^^^^^^^^^^^^^^^^^ Do not override `perform` in a `Gitlab::EventStore::Subscriber`.
+          end
+
+          def handle_event(event); end
+        end
+      WORKER
+    end
+  end
+
+  context 'when an event store subscriber does not override #perform' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~WORKER)
+        class SomeWorker
+          include Gitlab::EventStore::Subscriber
+
+          def handle_event(event); end
+        end
+      WORKER
+    end
+  end
+
+  context 'when an event store subscriber does not implement #handle_event' do
+    it 'registers an offense' do
+      expect_offense(<<~WORKER)
+        class SomeWorker
+          include Gitlab::EventStore::Subscriber
+          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ A `Gitlab::EventStore::Subscriber` must implement `#handle_event(event)`.
+        end
+      WORKER
+    end
+  end
+
+  context 'when a Sidekiq worker overrides #perform' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~WORKER)
+        class SomeWorker
+          include ApplicationWorker
+
+          def perform(*args); end
+        end
+      WORKER
+    end
+  end
+
+  context 'when a Sidekiq worker implements #handle_event' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~WORKER)
+        class SomeWorker
+          include ApplicationWorker
+
+          def handle_event(event); end
+        end
+      WORKER
+    end
+  end
+
+  context 'a non worker class' do
+    it 'does not register an offense' do
+      expect_no_offenses(<<~MODEL)
+        class Model < ApplicationRecord
+          include ActiveSupport::Concern
+        end
+      MODEL
+    end
+  end
+end