Test as if worker may be used elsewhere

ee/spec/workers/geo/verification_worker_spec.rb

@@ -3,12 +3,29 @@
 require 'spec_helper'
 
 RSpec.describe Geo::VerificationWorker, :geo do
+  include EE::GeoHelpers
+
   let(:package_file) { create(:conan_package_file, :conan_recipe_file) }
 
   describe '#perform' do
-    it 'calculates the checksum' do
-      expect { described_class.new.perform('package_file', package_file.id) }
-        .to change { package_file.reload.verification_checksum }.from(nil)
+    it 'calls calculate_checksum!' do
+      replicator = double(:replicator)
+      allow(::Gitlab::Geo::Replicator).to receive(:for_replicable_params).with(replicable_name: 'package_file', replicable_id: package_file.id).and_return(replicator)
+
+      expect(replicator).to receive(:calculate_checksum!)
+
+      described_class.new.perform('package_file', package_file.id)
+    end
+
+    context 'when on a primary node' do
+      before do
+        stub_primary_node
+      end
+
+      it 'calculates the checksum' do
+        expect { described_class.new.perform('package_file', package_file.id) }
+          .to change { package_file.reload.verification_checksum }.from(nil)
+      end
     end
   end
 end