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

spec/workers/delete_mute_worker_spec.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe DeleteMuteWorker do
+  let(:worker) { described_class.new }
+  let(:service) { instance_double(UnmuteService, call: true) }
+
+  describe '#perform' do
+    before do
+      allow(UnmuteService).to receive(:new).and_return(service)
+    end
+
+    context 'with an expired mute' do
+      let(:mute) { Fabricate(:mute, expires_at: 1.day.ago) }
+
+      it 'sends the mute to the service' do
+        worker.perform(mute.id)
+
+        expect(service).to have_received(:call).with(mute.account, mute.target_account)
+      end
+    end
+
+    context 'with an unexpired mute' do
+      let(:mute) { Fabricate(:mute, expires_at: 1.day.from_now) }
+
+      it 'does not send the mute to the service' do
+        worker.perform(mute.id)
+
+        expect(service).to_not have_received(:call)
+      end
+    end
+
+    context 'with a non-existent mute' do
+      it 'does not send the mute to the service' do
+        worker.perform(123_123_123)
+
+        expect(service).to_not have_received(:call)
+      end
+    end
+  end
+end