Add missing spec coverage

spec/initializers/forbid_sidekiq_in_transactions_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Sidekiq::Worker' do
+  let(:worker_class) do
+    Class.new do
+      include Sidekiq::Worker
+
+      def perform
+      end
+    end
+  end
+
+  it 'allows sidekiq worker outside of a transaction' do
+    expect { worker_class.perform_async }.not_to raise_error
+  end
+
+  it 'forbids queue sidekiq worker in a transaction' do
+    Project.transaction do
+      expect { worker_class.perform_async }.to raise_error(Sidekiq::Worker::EnqueueFromTransactionError)
+    end
+  end
+
+  it 'allows sidekiq worker in a transaction if skipped' do
+    Sidekiq::Worker.skipping_transaction_check do
+      Project.transaction do
+        expect { worker_class.perform_async }.not_to raise_error
+      end
+    end
+  end
+end