Move controller specs for well-known endpoints to request specs (#27855)

spec/requests/well_known/host_meta_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'The /.well-known/host-meta request' do
+  it 'returns http success with valid XML response' do
+    get '/.well-known/host-meta'
+
+    expect(response)
+      .to have_http_status(200)
+      .and have_attributes(
+        media_type: 'application/xrd+xml',
+        body: host_meta_xml_template
+      )
+  end
+
+  private
+
+  def host_meta_xml_template
+    <<~XML
+      <?xml version="1.0" encoding="UTF-8"?>
+      <XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0">
+        <Link rel="lrdd" template="https://cb6e6126.ngrok.io/.well-known/webfinger?resource={uri}"/>
+      </XRD>
+    XML
+  end
+end