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

spec/workers/post_process_media_worker_spec.rb

@@ -2,12 +2,38 @@
 
 require 'rails_helper'
 
-describe PostProcessMediaWorker do
+describe PostProcessMediaWorker, :paperclip_processing do
   let(:worker) { described_class.new }
 
-  describe 'perform' do
-    it 'runs without error for missing record' do
-      expect { worker.perform(nil) }.to_not raise_error
+  describe '#perform' do
+    let(:media_attachment) { Fabricate(:media_attachment) }
+
+    it 'reprocesses and updates the media attachment' do
+      worker.perform(media_attachment.id)
+
+      expect(media_attachment.processing).to eq('complete')
+    end
+
+    it 'returns true for non-existent record' do
+      result = worker.perform(123_123_123)
+
+      expect(result).to be(true)
+    end
+
+    context 'when sidekiq retries are exhausted' do
+      it 'sets state to failed' do
+        described_class.within_sidekiq_retries_exhausted_block({ 'args' => [media_attachment.id] }) do
+          worker.perform(media_attachment.id)
+        end
+
+        expect(media_attachment.reload.processing).to eq('failed')
+      end
+
+      it 'returns true for non-existent record' do
+        described_class.within_sidekiq_retries_exhausted_block({ 'args' => [123_123_123] }) do
+          expect(worker.perform(123_123_123)).to be(true)
+        end
+      end
     end
   end
 end