Let registrar users change registrar account

test/system/registrar_area/account_test.rb

@@ -0,0 +1,22 @@
+require 'test_helper'
+
+class RegistrarAccountTest < ApplicationSystemTestCase
+  setup do
+    @registrar = registrars(:bestnames)
+    sign_in users(:api_bestnames)
+  end
+
+  def test_updates_account
+    new_billing_email = 'new@registrar.test'
+    assert_not_equal new_billing_email, @registrar.billing_email
+
+    visit registrar_account_path
+    click_on 'Edit'
+
+    fill_in 'Billing email', with: new_billing_email
+    click_on 'Save changes'
+
+    assert_text 'Your account has been updated'
+    assert_text new_billing_email
+  end
+end