Hide/show ingress external ip help text

Use not_to instead of to__not

app/views/clusters/clusters/_form.html.haml

@@ -33,9 +33,9 @@
       - auto_devops_url = help_page_path('topics/autodevops/index')
       - auto_devops_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: auto_devops_url }
       = s_('ClusterIntegration|Specifying a domain will allow you to use Auto Review Apps and Auto Deploy stages for %{auto_devops_start}Auto DevOps%{auto_devops_end}. The domain should have a wildcard DNS configured matching the domain.').html_safe % { auto_devops_start: auto_devops_start, auto_devops_end: '</a>'.html_safe }
-      - if @cluster.application_ingress_external_ip.present?
+      %span{ :class => ["js-ingress-domain-help-text", ("hide" unless @cluster.application_ingress_external_ip.present?)] }
         = s_('ClusterIntegration|Alternatively')
-        %code #{@cluster.application_ingress_external_ip}.nip.io
+        %code{ :class => "js-ingress-external-ip-help-text" } #{@cluster.application_ingress_external_ip}.nip.io
         = s_('ClusterIntegration| can be used instead of a custom domain.')
       - custom_domain_url = help_page_path('user/project/clusters/index', anchor: 'pointing-your-dns-at-the-external-endpoint')
       - custom_domain_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: custom_domain_url }

spec/features/clusters/cluster_detail_page_spec.rb

@@ -4,6 +4,8 @@ require 'spec_helper'
 
 describe 'Clusterable > Show page' do
   let(:current_user) { create(:user) }
+  let(:cluster_ingress_help_text_selector) { '.js-ingress-domain-help-text' }
+  let(:hide_modifier_selector) { '.hide' }
 
   before do
     sign_in(current_user)
@@ -35,7 +37,7 @@ describe 'Clusterable > Show page' do
 
       it 'shows help text with the domain as an alternative to custom domain' do
         within '#cluster-integration' do
-          expect(page).to have_content('Alternatively 192.168.1.100.nip.io can be used instead of a custom domain')
+          expect(find(cluster_ingress_help_text_selector)).not_to match_css(hide_modifier_selector)
         end
       end
     end
@@ -45,7 +47,7 @@ describe 'Clusterable > Show page' do
         visit cluster_path
 
         within '#cluster-integration' do
-          expect(page).not_to have_content('can be used instead of a custom domain.')
+          expect(find(cluster_ingress_help_text_selector)).to match_css(hide_modifier_selector)
         end
       end
     end