Add spec coverage for workers/redownload_* worker classes (#27892)

spec/workers/redownload_media_worker_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe RedownloadMediaWorker do
+  let(:worker) { described_class.new }
+
+  describe '#perform' do
+    it 'returns nil for non-existent record' do
+      result = worker.perform(123_123_123)
+
+      expect(result).to be_nil
+    end
+
+    it 'returns nil without a remote_url' do
+      media_attachment = Fabricate(:media_attachment, remote_url: '')
+
+      result = worker.perform(media_attachment.id)
+
+      expect(result).to be_nil
+    end
+
+    context 'with a valid remote url' do
+      let(:url) { 'https://example.host/file.txt' }
+
+      before { stub_request(:get, url).to_return(status: 200) }
+
+      it 'processes downloads for valid record' do
+        media_attachment = Fabricate(:media_attachment, remote_url: url)
+
+        worker.perform(media_attachment.id)
+
+        expect(a_request(:get, url)).to have_been_made
+      end
+    end
+  end
+end