Add request spec for backups download (mastodon#25099)

spec/requests/backups_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'Backups' do
+  include RoutingHelper
+
+  describe 'GET backups#download' do
+    let(:user) { Fabricate(:user) }
+    let(:backup) { Fabricate(:backup, user: user) }
+
+    before do
+      sign_in user
+    end
+
+    it 'Downloads a user backup' do
+      get download_backup_path(backup)
+
+      expect(response).to redirect_to(backup_dump_url)
+    end
+
+    def backup_dump_url
+      full_asset_url(backup.dump.url)
+    end
+  end
+end