Improve spec coverage for collection of workers/ classes (#27874)

spec/workers/import_worker_spec.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe ImportWorker do
+  let(:worker) { described_class.new }
+  let(:service) { instance_double(ImportService, call: true) }
+
+  describe '#perform' do
+    before do
+      allow(ImportService).to receive(:new).and_return(service)
+    end
+
+    let(:import) { Fabricate(:import) }
+
+    it 'sends the import to the service' do
+      worker.perform(import.id)
+
+      expect(service).to have_received(:call).with(import)
+      expect { import.reload }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+end