Implement post-release one login banner for sign in page

Co-Authored-By: avinhurry <[email protected]>

app/components/candidate_interface/one_login_post_release_sign_in_banner_component.html.erb

@@ -0,0 +1,4 @@
+<%= govuk_notification_banner(title_text: t('.title')) do |banner| %>
+  <% banner.with_heading(text: t('.heading')) %>
+  <%= t('.text_html') %>
+<% end %>

app/components/candidate_interface/one_login_post_release_sign_in_banner_component.rb

@@ -0,0 +1,7 @@
+module CandidateInterface
+  class OneLoginPostReleaseSignInBannerComponent < ViewComponent::Base
+    def render?
+      FeatureFlag.active?(:one_login_candidate_sign_in)
+    end
+  end
+end

app/views/candidate_interface/start_page/create_account_or_sign_in.html.erb

@@ -5,6 +5,7 @@
 <div class="govuk-grid-row">
   <div class="govuk-grid-column-two-thirds">
     <%= render CandidateInterface::OneLoginPreReleaseSignInBannerComponent.new %>
+    <%= render CandidateInterface::OneLoginPostReleaseSignInBannerComponent.new %>
 
     <% if FeatureFlag.active?(:one_login_candidate_sign_in) %>
 

config/locales/components/candidate_interface/one_login_post_release_sign_in_banner_component.yml

@@ -0,0 +1,8 @@
+en:
+  candidate_interface:
+    one_login_post_release_sign_in_banner_component:
+      title: Important
+      heading: How you sign in has changed
+      text_html:
+        <p class="govuk-body">Sign in using your GOV.UK One Login. If you do not have one you can create one.</p>
+        <p class="govuk-body">If you have signed in to Apply for teacher training before, you should use the same email address to create your GOV.UK One Login.</p>

spec/components/candidate_interface/one_login_post_release_sign_in_banner_component_spec.rb

@@ -0,0 +1,27 @@
+require 'rails_helper'
+
+RSpec.describe CandidateInterface::OneLoginPostReleaseSignInBannerComponent do
+  context 'One login is deactivated' do
+    before do
+      FeatureFlag.deactivate(:one_login_candidate_sign_in)
+    end
+
+    it 'does not renders the component' do
+      result = render_inline(described_class.new)
+      expect(result.content).to be_empty
+    end
+  end
+
+  context 'One login is activated' do
+    before do
+      FeatureFlag.activate(:one_login_candidate_sign_in)
+    end
+
+    it 'does render the component' do
+      result = render_inline(described_class.new)
+      expect(result).to have_content 'How you sign in has changed'
+      expect(result).to have_content 'Sign in using your GOV.UK One Login. If you do not have one you can create one.'
+      expect(result).to have_content 'If you have signed in to Apply for teacher training before, you should use the same email address to create your GOV.UK One Login.'
+    end
+  end
+end

spec/components/previews/candidate_interface/one_login_pre_release_banners_preview.rb

@@ -7,5 +7,9 @@ def one_login_pre_release_logged_in_banner_component
     def one_login_pre_release_sign_in_banner_component
       render(CandidateInterface::OneLoginPreReleaseSignInBannerComponent.new)
     end
+
+    def one_login_post_release_sign_in_banner_component
+      render CandidateInterface::OneLoginPostReleaseSignInBannerComponent.new
+    end
   end
 end