Add tests, fix error handling

test/system/admin_area/domains/legal_doc_test.rb

@@ -0,0 +1,21 @@
+require 'application_system_test_case'
+
+class AdminAreaDomainsLegalDocTest < ApplicationSystemTestCase
+  setup do
+    sign_in users(:admin)
+    @domain = domains(:shop)
+    @document = LegalDocument.create(
+      document_type: 'pdf',
+      documentable_id: @domain.id,
+      documentable_type: 'Domain',
+      path: '\zzz\zzz'
+    )
+  end
+
+  def test_absent_doc_downloading_without_errors
+    visit admin_domain_url(@domain)
+    assert_nothing_raised do
+      click_on "#{@document.created_at}"
+    end
+  end
+end