Convert statuses spec controller->system/request (#33921)

spec/system/statuses_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Status page' do
+  let(:status) { Fabricate :status }
+
+  it 'visits the status page and renders the web app' do
+    visit short_account_status_path(account_username: status.account.username, id: status.id)
+
+    expect(page)
+      .to have_css('noscript', text: /Mastodon/)
+      .and have_css('body', class: 'app-body')
+  end
+end