Don't show subscribable banner to auto_renew:nil

This is a bugfix. While 1576 has already been closed, we were informed
that we were displaying the banner to customers who's subscription was
auto_renew:nil. The problem ended up being that we were coercing the
value from nil to false while doing the check.

I've updated the code to use the attribute directly. I've also updated a
few of the method names to reflect that the value can be nil.

part of: https://gitlab.com/gitlab-org/growth/product/-/issues/1576

ee/app/models/license.rb

@@ -494,7 +494,7 @@ class License < ApplicationRecord
     starts_at > Date.current
   end
 
-  def auto_renew?
+  def auto_renew
     false
   end
 

ee/changelogs/unreleased/jswain_dont_display_subscribable_banner_to_auto_renew_nil.yml

+---
+title: Only show subscribable banner when auto-renew is set
+merge_request: 38962
+author:
+type: fixed

ee/lib/gitlab/expiring_subscription_message.rb

@@ -9,6 +9,8 @@ module Gitlab
 
     attr_reader :subscribable, :signed_in, :is_admin, :namespace
 
+    delegate :auto_renew, to: :subscribable
+
     def initialize(subscribable:, signed_in:, is_admin:, namespace: nil)
       @subscribable = subscribable
       @signed_in = signed_in
@@ -38,7 +40,7 @@ module Gitlab
 
     def expired_subject
       if subscribable.block_changes?
-        if auto_renew?
+        if auto_renew
           _('Something went wrong with your automatic subscription renewal.')
         else
           _('Your subscription has been downgraded.')
@@ -73,7 +75,7 @@ module Gitlab
     end
 
     def namespace_block_changes_message
-      if auto_renew?
+      if auto_renew
         support_link = '<a href="mailto:support@gitlab.com">support@gitlab.com</a>'.html_safe
 
         _('We tried to automatically renew your %{strong}%{plan_name}%{strong_close} subscription for %{strong}%{namespace_name}%{strong_close} on %{expires_on} but something went wrong so your subscription was downgraded to the free plan. Don\'t worry, your data is safe. We suggest you check your payment method and get in touch with our support team (%{support_link}). They\'ll gladly help with your subscription renewal.') % { plan_name: plan_name, strong: strong, strong_close: strong_close, namespace_name: namespace.name, support_link: support_link, expires_on: expires_at_or_cutoff_at.strftime("%Y-%m-%d") }
@@ -124,11 +126,11 @@ module Gitlab
     end
 
     def auto_renew_choice_exists?
-      auto_renew? != nil
+      !auto_renew.nil?
     end
 
     def expiring_auto_renew?
-      auto_renew? && !expired_but_within_cutoff?
+      !!auto_renew && !expired_but_within_cutoff?
     end
 
     def expired_subscribable_within_notification_window?
@@ -149,10 +151,6 @@ module Gitlab
       '</strong>'.html_safe
     end
 
-    def auto_renew?
-      subscribable.auto_renew?
-    end
-
     def grace_period_effective_from
       Date.parse('2020-07-22')
     end

ee/spec/lib/gitlab/expiring_subscription_message_spec.rb

@@ -33,7 +33,7 @@ RSpec.describe Gitlab::ExpiringSubscriptionMessage do
       before do
         allow(subscribable).to receive(:plan).and_return('ultimate')
         allow(subscribable).to receive(:expires_at).and_return(expired_date)
-        allow(subscribable).to receive(:auto_renew?).and_return(auto_renew)
+        allow(subscribable).to receive(:auto_renew).and_return(auto_renew)
       end
 
       context 'subscribable should not notify admins' do

ee/spec/models/license_spec.rb

@@ -964,9 +964,9 @@ RSpec.describe License do
     end
   end
 
-  describe '#auto_renew?' do
+  describe '#auto_renew' do
     it 'is false' do
-      expect(license.auto_renew?).to be false
+      expect(license.auto_renew).to be false
     end
   end
 end