Convert instance_actor controller spec to request spec (#31621)

spec/requests/instance_actor_spec.rb

@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Instance actor endpoint' do
+  describe 'GET /actor' do
+    before do
+      integration_session.https! # TODO: Move to global rails_helper for all request specs?
+      host! Rails.configuration.x.local_domain # TODO: Move to global rails_helper for all request specs?
+    end
+
+    let!(:original_federation_mode) { Rails.configuration.x.limited_federation_mode }
+
+    shared_examples 'instance actor endpoint' do
+      before { get instance_actor_path(format: :json) }
+
+      it 'returns http success with correct media type and body' do
+        expect(response)
+          .to have_http_status(200)
+        expect(response.content_type)
+          .to start_with('application/activity+json')
+        expect(body_as_json)
+          .to include(
+            id: instance_actor_url,
+            type: 'Application',
+            preferredUsername: 'mastodon.internal',
+            inbox: instance_actor_inbox_url,
+            outbox: instance_actor_outbox_url,
+            publicKey: include(
+              id: instance_actor_url(anchor: 'main-key')
+            ),
+            url: about_more_url(instance_actor: true)
+          )
+      end
+
+      it_behaves_like 'cacheable response'
+    end
+
+    context 'with limited federation mode disabled' do
+      before { Rails.configuration.x.limited_federation_mode = false }
+      after { Rails.configuration.x.limited_federation_mode = original_federation_mode }
+
+      it_behaves_like 'instance actor endpoint'
+
+      context 'with a disabled instance actor' do
+        before { disable_instance_actor }
+
+        it_behaves_like 'instance actor endpoint'
+      end
+    end
+
+    context 'with limited federation mode enabled' do
+      before { Rails.configuration.x.limited_federation_mode = true }
+      after { Rails.configuration.x.limited_federation_mode = original_federation_mode }
+
+      it_behaves_like 'instance actor endpoint'
+
+      context 'with a disabled instance actor' do
+        before { disable_instance_actor }
+
+        it_behaves_like 'instance actor endpoint'
+      end
+    end
+
+    def disable_instance_actor
+      Account
+        .representative
+        .update(suspended_at: 10.days.ago)
+    end
+  end
+end