Convert specs to tests

#343

test/integration/admin/registrars/edit_registrar_test.rb

@@ -0,0 +1,17 @@
+require 'test_helper'
+
+class EditRegistrarTest < ActionDispatch::IntegrationTest
+  def setup
+    login_as create(:admin_user)
+  end
+
+  def test_updates_registrar
+    registrar = create(:registrar)
+
+    visit admin_registrar_path(registrar)
+    click_link_or_button 'Edit'
+    click_link_or_button 'Update registrar'
+
+    assert_text 'Registrar has been successfully updated'
+  end
+end