Coverage for domain block worker (#2997)

spec/workers/domain_block_worker_spec.rb

+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe DomainBlockWorker do
+  subject { described_class.new }
+
+  describe 'perform' do
+    let(:domain_block) { Fabricate(:domain_block) }
+
+    it 'returns true for non-existent domain block' do
+      service = double(call: nil)
+      allow(BlockDomainService).to receive(:new).and_return(service)
+      result = subject.perform(domain_block.id)
+
+      expect(result).to be_nil
+      expect(service).to have_received(:call).with(domain_block)
+    end
+
+    it 'calls domain block service for relevant domain block' do
+      result = subject.perform('aaa')
+
+      expect(result).to eq(true)
+    end
+  end
+end