Add mailer previews to support settings

app/controllers/claims/support/mailers_controller.rb

@@ -0,0 +1,7 @@
+class Claims::Support::MailersController < Claims::Support::ApplicationController
+  before_action :skip_authorization
+
+  def index
+    @previews = ActionMailer::Preview.all.filter { |preview| preview.preview_name.start_with?("claims/") }
+  end
+end

app/views/claims/support/mailers/index.html.erb

@@ -0,0 +1,15 @@
+<% render "claims/support/primary_navigation", current: :settings %>
+
+<div class="govuk-width-container">
+  <h1 class="govuk-heading-l">Email Previews</h1>
+
+  <% @previews.each do |mailer| %>
+    <h2 class="govuk-heading-m"><%= mailer.preview_name.delete_prefix("claims/").titleize %></h2>
+
+    <% email_links = mailer.emails.map do |email| %>
+      <% govuk_link_to(email, url_for(controller: "/rails/mailers", action: :preview, path: "#{mailer.preview_name}/#{email}"), no_visited_state: true, new_tab: true) %>
+    <% end %>
+
+    <%= govuk_list email_links, type: :bullet %>
+  <% end %>
+</div>

app/views/claims/support/settings/index.html.erb

@@ -8,6 +8,7 @@
 
       <%= govuk_list [
         govuk_link_to("Background Jobs", "/good_job", no_visited_state: true, new_tab: true),
+        govuk_link_to("Emails", claims_support_mailers_path, no_visited_state: true),
       ], spaced: true %>
     </div>
   </div>

config/application.rb

@@ -36,6 +36,9 @@ class Application < Rails::Application
       "node_modules/govuk-frontend/dist/govuk/assets",
     )
 
+    config.action_mailer.show_previews = true
+    config.action_mailer.preview_paths << Rails.root.join("spec/mailers/previews").to_s
+
     config.view_component.preview_paths << Rails.root.join("spec/components/previews").to_s
     config.view_component.default_preview_layout = "component_preview"
 

config/routes/claims.rb

@@ -108,5 +108,7 @@
     end
 
     get :settings, to: "settings#index"
+
+    resources :mailers, only: :index
   end
 end

spec/mailers/previews/claims/support_user_mailer_preview.rb

@@ -0,0 +1,9 @@
+class Claims::SupportUserMailerPreview < ActionMailer::Preview
+  def support_user_invitation
+    SupportUserMailer.with(service: :claims).support_user_invitation(Claims::SupportUser.first)
+  end
+
+  def support_user_removal_notification
+    SupportUserMailer.with(service: :claims).support_user_removal_notification(Claims::SupportUser.first)
+  end
+end

spec/mailers/previews/claims/user_mailer_preview.rb

@@ -0,0 +1,17 @@
+class Claims::UserMailerPreview < ActionMailer::Preview
+  def user_membership_created_notification
+    UserMailer.with(service: :claims).user_membership_created_notification(Claims::User.first, Claims::School.first)
+  end
+
+  def user_membership_destroyed_notification
+    UserMailer.with(service: :claims).user_membership_destroyed_notification(Claims::User.first, Claims::School.first)
+  end
+
+  def claim_submitted_notification
+    UserMailer.with(service: :claims).claim_submitted_notification(Claims::User.first, Claims::Claim.submitted.first)
+  end
+
+  def claim_created_support_notification
+    UserMailer.with(service: :claims).claim_created_support_notification(Claims::Claim.draft.first, Claims::User.first)
+  end
+end

spec/system/claims/support/view_emails_spec.rb

@@ -0,0 +1,39 @@
+require "rails_helper"
+
+RSpec.describe "View Emails", service: :claims, type: :system do
+  let(:support_user) { create(:claims_support_user) }
+
+  before do
+    user_exists_in_dfe_sign_in(user: support_user)
+    given_i_sign_in
+  end
+
+  scenario "User visits the emails page" do
+    when_i_visit_the_emails_page
+    then_i_can_see_the_list_of_claims_email_templates
+  end
+
+  private
+
+  def given_i_sign_in
+    visit sign_in_path
+    click_on "Sign in using DfE Sign In"
+  end
+
+  def when_i_visit_the_emails_page
+    click_on "Settings"
+    click_on "Emails"
+  end
+
+  def then_i_can_see_the_list_of_claims_email_templates
+    expect(page).to have_content("Support User Mailer")
+    expect(page).to have_link("support_user_invitation (opens in new tab)", href: "/rails/mailers/claims/support_user_mailer/support_user_invitation")
+    expect(page).to have_link("support_user_removal_notification (opens in new tab)", href: "/rails/mailers/claims/support_user_mailer/support_user_removal_notification")
+
+    expect(page).to have_content("User Mailer")
+    expect(page).to have_link("claim_created_support_notification (opens in new tab)", href: "/rails/mailers/claims/user_mailer/claim_created_support_notification")
+    expect(page).to have_link("claim_submitted_notification (opens in new tab)", href: "/rails/mailers/claims/user_mailer/claim_submitted_notification")
+    expect(page).to have_link("user_membership_created_notification (opens in new tab)", href: "/rails/mailers/claims/user_mailer/user_membership_created_notification")
+    expect(page).to have_link("user_membership_destroyed_notification (opens in new tab)", href: "/rails/mailers/claims/user_mailer/user_membership_destroyed_notification")
+  end
+end