Republish Worldwide Organisation on Corporate Information Pages changes

Currently, Organisations are republished when a related Corporate Information
Pages changes, but Worldwide Organisations are not. Now that we publish
Worldwide Corporate Information Pages, we want to change this.

This is important because the Worldwide Organisation content item surfaces
information about related Corporate Information Pages on it's `details` rather
than it's `links` (though the links are present as well, they aren't used. This
is consistent with the Organisation content item).

app/models/corporate_information_page.rb

@@ -2,7 +2,7 @@ class CorporateInformationPage < Edition
   include ::Attachable
   include Searchable
 
-  after_commit :republish_organisation_to_publishing_api
+  after_commit :republish_owning_organisation_to_publishing_api
   after_commit :republish_about_page_to_publishing_api, unless: :about_page?
   after_save :reindex_organisation_in_search_index, if: :about_page?
 
@@ -31,8 +31,8 @@ def process_associations_before_save(new_edition)
   scope :with_organisation_govuk_status, ->(status) { joins(:organisation).where(organisations: { govuk_status: status }) }
   scope :accessible_documents_policy, -> { where(corporate_information_page_type_id: CorporateInformationPageType::AccessibleDocumentsPolicy.id) }
 
-  def republish_organisation_to_publishing_api
-    Whitehall::PublishingApi.republish_async(owning_organisation) if owning_organisation.is_a?(Organisation)
+  def republish_owning_organisation_to_publishing_api
+    Whitehall::PublishingApi.republish_async(owning_organisation) if owning_organisation.present?
   end
 
   def republish_about_page_to_publishing_api

test/unit/models/corporate_information_page_test.rb

@@ -30,4 +30,30 @@ class CorporateInformationPageTest < ActiveSupport::TestCase
     corporate_information_page = create(:corporate_information_page, organisation: nil, worldwide_organisation: nil)
     assert_nil corporate_information_page.base_path
   end
+
+  test "republishes owning organisation after commit when present" do
+    organisation = create(:organisation)
+    corporate_information_page = create(:corporate_information_page, organisation:, worldwide_organisation: nil)
+
+    Whitehall::PublishingApi.expects(:republish_async).with(organisation).once
+
+    corporate_information_page.update!(body: "new body")
+  end
+
+  test "republishes owning worldwide organisation after commit when present" do
+    worldwide_organisation = create(:worldwide_organisation)
+    corporate_information_page = create(:corporate_information_page, organisation: nil, worldwide_organisation:)
+
+    Whitehall::PublishingApi.expects(:republish_async).with(worldwide_organisation).once
+
+    corporate_information_page.update!(body: "new body")
+  end
+
+  test "does not republish owning organisation when absent" do
+    corporate_information_page = create(:corporate_information_page, organisation: nil, worldwide_organisation: nil)
+
+    Whitehall::PublishingApi.expects(:republish_async).never
+
+    corporate_information_page.update!(body: "new body")
+  end
 end